WALLBOARD ON TUB

[@StarrTile]

IF THIS HELPED YOU THEN HELP ME HERE www.paypal.com/donate/?token=7rVJdW7Mt2gppEUOTnO6p2oydgTK9cKNXOYB78uWDuQBIrQLl5I03ARvnIeBwn2HTMqkZW6skgd2U0PC&locale.x=US&Z3JncnB0=

[@luv14lyf]

This link doesn't work😕

[@nja3224]

Was just going to say the same.

[@luv14lyf]

Hey Bob, did you ever figure out what's wrong with this link?

[@StarrTile]

I'm not sure, sometimes PayPal is funny on their links..try this www.paypal.com/donate/?token=kncnthfk6W1tGnTGsn7Vb4EMQUmyLoXFKbv6ljOdrdrG64Tn_XRUxin-ov24MVLonjCzlCCUwWG2LhmZ&locale.x=US

[@nja3224]

@@StarrTile Still not working

[@kirktownander2825]

I see the possible benefit of this, but what supports the grout behind that lowest 1/2” of tile where it projects past the bottom of the green board or Durock?

[@joshualopez2679]

Hey, I just want to say thank you very much for making this video. I am in the process of doing this today, I told my dad about this video (he's been in construction for about 40 years - tile is his specialty) and he said everything you said is correct. So, thank you for making great, honest videos. Please keep it up.

[@gregniemelacarpentryllc]

I take zip tape and wrap the edges of the drywall

[@RolandTemple]

I read the tub instructions that came with my new tub and it said to run your wall board OVER the tub flange. Not something I'm used to doing. So I was interested in shim techniques to do that. This video gives a solid argument to continue to do things the right way, thank you!

[@davep857]

I know this is an older video, but I've been re-watching tile videos again after leaving for a few years from an 18 year run in the basement finishing business I started in 2001 in Chicago. I've cone all my own tile work on bathrooms, flooring and bars for 12 years of that time. I discovered your channel in 2015 on building shower pans. I love your detail and real world experience explanations of how to understand each step of your methods. I've found tile work to be exciting to complete and with the many versions of methods on the proper procedures, its more a challenge to find relatable examples to my own experiences in tile work. Thank you so much Bob for the time you take to help teach real hands on applications for tile methods. I've got 4 bathroom jobs lined up now and one is a large master bath with certain tile requirements that will likely challenge my skills. But that's how we grow in our skill sets, we can't wait for the experience to just find us. It's consistently stepping out of our current comfort skill zones to try new and more difficult projects. With help from people like you and the detailed videos you do, I know I can learn and apply my skills to achieve professional results. Thank you again Bob, your awesome! Dave Another aspiring home remodeler from Chicago

[@StarrTile]

Thank you sir, I appreciate the kind words, yes there are a hundred ways to skin a cat, and thousands of people on KZbin trying to show you, everything I do is my method and probably quite a bit different from others... But end result should be similar acroos the board

[@davep857]

@@StarrTile Bob, I have a material question that I hope you may have some input on. I'm set to begin tiling a tub shower wall job soon. My customer chose a 3/16" (very thin in my opinion for a shower wall application) wavy translucent glass subway tile on a 12x12 approx. sheets for the walls. My thoughts having never installed glass tile that thin, are that possible cracking after curing due to expansion and contraction could occur with thin glass tile. Am I reading to deep into this, also the glass tiles will all have a cut edge for every other tile on them on the outside walls where they meet the transitioning drywall surface. This scenario has a few new challenges for me so any input would be much appreciated. I will have to find a tile edge method to make the edge of cut glass tiles look professional. I doubt my customer asked about the glass tile sheets being approved for wet applications. I'll have to ask tomorrow at the job. Thanks again Bob for your input and great videos. Dave BDI Remodeling

[@basilbcf]

Glad I found this video. I'm in the process of a total bathroom remodel, including of course re-tiling my tub/shower. I'm not a tile expert, but I am an engineer and understand fluid dynamics and what you have said about mounting the backer board above the lip makes a lot of sense.

[@rbittel3274]

Hi Bob thank you for this great video. My tub/shower failed & I have scoured the internet to understand this interface between cement board and tub flange so I get it right. While I am generally a DIYer, I had this work done 11 years ago by a reputable 'professional' when I was overwhelmed by my day job. Anyway, the thing I wanted to relate is that he did actually follow your method and the cement board still got soaked. What I wanted to add as perhaps a caveat to your explanation, is that you need to also pay attention to your air block & vapour barrier system. My installation has two exterior walls and I live in a cooler climate. I think I have pieced together what went wrong, and as with most failures, it was a few things. My contractor failed to put a vapour barrier behind the cement board on one of the exterior walls and did not take the time to properly complete/seal the vapour barrier on the other wall. He also missed insulation between one of the stud spaces on one of the walls. He also did not fully seal the penetrations. He did not liquid seal the cement board, which would be ok as long he had used a traditional plastic sheet vapour barrier behind it as per code in my area (cold climate means vapour barrier is on warm side of insulation). I can't say I did an awesome job maintaining the silicone caulking between the tub and cement board nor annually seal the grout lines - although I did both periodically - so I guess I have to wear some of this. Either way, the air seal was incomplete and there were other gaps (ie. at the penetrations) and the fact the tile/grout & cement board is not in itself a total block if unsealed. So I ended up with very, very wet cement board, soaked from the back side where the humid air hit the cold. The epicenter was where the insulation was missing and thus the coldest. Here the cement board warped and exacerbated grout failure (which I tried to repair a couple of times not knowing what was going on behind the wall) - the wetness spread in a cone shape from there. So long story short, I just wanted to add to your good recommendation that the vapour barrier and how you block humid air from going behind your wall (air block) is important to consider. If you choose to liquid seal the tile side of your cement board, this qualifies as a vapour barrier, but then you need to make sure you seal the tub to cement board interface with silicon and also any penetrations, to prevent air getting behind your wall and condensing. If you don't use the liquid seal approach, that is ok too, but then you must install a traditional vapour barrier (ie. plastic sheet) between your cement board and your insulation. The latter seems acceptable by building standards, but I don't like the idea of the water condensing on the plastic sheet if the air block is incomplete, so I'm going to fully liquid seal the cement board and silicone all air gaps. I'm also going to try acrylic grout, which is supposed to not requiring sealing and is less likely to crack over time. The acrylic grout will only be on the walls and not used for shower floor tile (since I have a tub) - where I have seen people report it can fail (ie. if wet all the time). Hope that helps someone.... or perhaps generates some discussion - I don't purport to be an expert and maybe someone wiser or more experienced will correct me - but my contractor certainly failed the test!.... I am still bitter I have to take on this project, not to mention the money wasted on a contractor!

[@joedean9834]

Look into the Kerdi system by Schluder. It is a little pricey, but combines the backer board and waterproofing into one system.

[@stephaniek2913]

Thank you for all your comments. I'm just getting started and this gives me a lot of things to keep in mind.

[@michaelking42]

Thanks for taking the time to add this information, I found it very helpful for my shower remodel I am working on.

[@RichardMcDonald-k6r]

Man am I amazed and happy that you provided this information, I used to be a preservation contractor and my son and i have seen some scenes of black mold that you do not want to even experience in anyone's lifetime. We have seen the destruction that these costly mistakes have made. I am so happy I came across this video and your response. You are so right insulation, vapor barrier, and any penetrations with proper material. God bless you thank you very much I am about to take on a project of this magnitude and do not want to make simple similar mistakes.

[@chadlove3443]

Thank you. I just watched 2 videos showing to sit the cement board on the tub, but the lip seems to be about 1/2" thick, same as the cement board, and if you were to install the board onto the edge of the tub, it will be curved at the bottom.... So many people saying different things. I'm just going to hang the tile down a quarter inch over the lip to cover up the screws.

[@scottpfeifer7782]

I've watched several of your videos on the topic of NOT resting the backerboard on top of the tub/pan ledge, but rather on or just above the lip. The you suggest not making contact with the tub with the tile either, but rather to leave a gap and not even seal it. Won't that look unfinished? I know it will prevent wicking and allow air to dry whatever water gets on top of the ledge, but I don't think that would look too swell. Do you have a video that shows what one of your finished jobs looks like, specifically the tile to tub area appearance?

[@wbrowning52ify]

Thank you for answering this question about where to set the wall board. I'll take the advice of experience for what to do and what not to do over textbooks any time. I'm working on a bathroom remodel in a house that's from the late '70's. The walls are close to being plumb. Every wall sits on the edge of the bubble at the line. All wall slope is wider at the ceiling than the tub. I'll need to work on the studs before setting the backer board and sealing. I'm still doing the research to do everything the right way. Thank you for taking the time to teach others through videos such as this. It means a lot for people like myself.

[@georgebell3964]

I am about to do my tub and shower over again. And I’ve been looking for someone who knows what they’re talking about. And you have answered all my questions my friend Great job.

[@jonc222]

Thank you. It’s clear that the board should be just above the lip, but what about the tiles? Set them with a small gap to the edge? And do you caulk that edge or leave it open so any water that does get behind the tiles can drain into the shower?

[@bobbybergman7141]

min 15 and 20:30 are the answers I needed, set it on the lip not the edge. love it thanks boss.

[@nja3224]

I'm almost ready to durian my tub alcove. I've watched countless YT videos, including the ones shown in this video by others. You listen/watch each independently, and they all sound right. This video is the latest one I watched, and I decided to go with this method. Ill take real world experience and knowledge gained over time over the "book" any day of the week. I'm also going to silicone the gap, even though you suggested it isn't necessary. It didn't sound like it can hurt, might be a waste and redundant but that's alright. I think ill sleep better, lol. Thank you for this. Will be making a donation.

[@bhickey4009]

Your hands are your resumé 👍 thank you for posting this with examples from your experience, I'm setting and tiling around a tub for the first time and I was having a hard time finding out whether to go over or above the lip. What you say, leaving a gap between the board and the lip to prevent mold, makes sense to me!

[@charlesjohn6500]

No, you are making sense. Thank you so much for these informative instructions. There is no way I could have known this.

[@geneduclos4003]

Great video. Thank you for taking the time. Now, what if one is not installing tile over the sheet rock, how is that gap filled? Thanks.

[@mrDmastr19]

I’ve watched all the “pros” on KZbin. And I’m still in the homework phase of re modeling my bathroom. I got to say, I agree with Bob on this. And his method for the backer/ tub flange will be what I follow.

[@menchelke]

Hey thanks again for posting these videos. I am working on a reefer container tiny home, and just putting in my wallboard around the tub flange, I only put 1 sheet up, and then was like... oh I need to double check StarR Tile. I did it correctly, but it's because I have came back to this video half a dozen times over the years to keep refreshing myself. Invaluable information as always, thanks again!!!

[@franksanchez834]

Thank you so much for this awesome video. I learned a lot, I’m glad I took the time to watch your video because I was going to do it all wrong, lol. Again I appreciate you taking the time to educate us.

[@12thDecember]

Finally, after watching about 10 videos, I've got the answer I'm looking for. Thank you! I bet that's a Kohler tub. I just had one installed (which is why I'm watching this video about backer board), and the lip on the front (the "wet side") is 2 inches wide, the lip along the side is 1 inch wide, and the lip at the back is 4 1/2 inches wide. _All_ of them have a bullnose design for water to flow into the tub instead of sitting on the lip.

[@steveward1181]

I have done a few tubs and showers in my 50 years in houses. I too stay up on the shower pan lip or tub lip, but I always added a plastic J molding on the bottom edge of any material I was installing, be it greenboard, drywall,cement board,etc. It has absolutely helped protect the raw edge against bad stuff in the future. Thanks for your video and good advice.

[@johnbalogna803]

Very informative thanks. We are doing my son bath remodel this week so it was definitely informative. Were removing his tub and putting in a shower pan. Using mold resistant rock and the palisades grout-less tile system. New subscriber thanks you much for the timely instruction.

[@brianmorris7498]

T Y ! I will take experience in the field over “book” every time ! Great info! And your work in your craft is amazing!!

[@klincoln80]

My question is if I do it your way, what keeps the cool grout in place for the portion of the tile that is hanging down below the wall board. There needs to be something behind that grout so that it’s not just floating in the air

[@StarrTile]

The distance is perhaps three quarters of an inch, or even 1" from a typical 12x24 is nothing. Even a 4" tile grabs 3 inches of wallboard, so what's the issue ? Typically the grout is only as deep as the tile anyway. Run silicone where tiles bottom out at tub and that'll add strength too, but I have never encountered a problem.

[@salazteca1]

That’s it , from now on im only going to watch videos about tile from this channel Thanks much! for taking the time to share this content

[@WesterlyPrune99]

My bath tub is from the 50s so it didn’t have a lip on it. The old drywall was about a half inch above the tub then tile flush to the tub and caulked. Do I do the same thing when I install the new cement board and tile?

[@StarrTile]

Yup 👍🏻

[@RusticTrini57]

@@StarrTile That didn't work for me. My fiberglass tub also does not have a lip. I have caulked it twice and it still leaks in the same small spot. Was thinking of removing the bottom row of tiles and applying window flashing to the cement board and top of tub, before re-tile-ing and caulking the joint between the ceramic tile and the top of tub. Would the window flashing leak? Does it permanently waterproof to fiberglass and cement board?

[@bmcginnis6543]

I bought a Dreamline shower pan last week. The instructions specifically state to put the backer board on top (above) of the pan edge. Not over it - in any way. So it cannot wick moisture up.

[@Musicofjonesey]

I watched the “Sal” guy first when YouTubing how to join my tub with the wall and my inexperienced rear knew better than sitting any substrate below the flange🤦🏻‍♂️. Thanks for the reassurance.

[@ariyanwallace5830]

Fantastic video. Finally some good advice. Love it ❤

[@justinlocke]

My last apartment, they had a handyman re do the tile and this is exactly what happened. plus the faucet control had a leak and it saturated all around. Just curious tho, if you were continuing on this tub install, would you use grout or caulk where the tile meets the tub?

[@StarrTile]

Yes, very very common in apartments, I usually will put in grout, until there is a reason to use caulking I don't advocate for it... although I have done direct caulking in there without grout, it depends on the application I suppose

[@LinneaMae68]

Thank you for this. I just took possession of a place and both bathrooms have the drywall coming right down to the tub. One looks exactly like that tiled wall at the beginning of your video. I called Bath Fitters and mentioned that the people before did that and they replied "drywall is supposed to come down inside the tub lip" 🤦🏻 nevermind...I won't be needing your services. To me it just seems common sense. Water is the most invasive element. No amount of silicone will keep it out.

[@michaelking42]

This is an excellent video on this subject, but it raises the question for me; do I install the hardie cement backer board on the lip, or leave a 1/8" gap above the lip? As both methods are mentioned @3:00 for example.

[@annwltr]

thank you! is it the same with a shower surround?

[@StarrTile]

Yes

[@TheSotexy2]

Will make sure to do this on my project next week. Question I have is, do you think set the backer board and tub after mesh taping or Kerdi sealing them together? Then do you bring the tile onto the edge and silicone underneath the bottom tile to the tub?

[@wonka1234]

Wont the tile at the bottom be angled if you put the board on the lip? It wont line up perfectly

[@ibenglish]

Question. I am using a cast iron shower pan and hardi backer. I am not going to tile but use something called micro Crete which is like a concrete and plaster mix and will be a finished surface over the backer. A sealer is built into the product and I plan on using red guard underneath as an extra precaution. Would the same placement of the hardi backer to the lip apply or would a bevel where the backer meets the pan be best. Thank you 👍🏻

[@StarrTile]

@ibenglish where all the way you will be doing it with the material that you will be using it's already sounding like a bullet proof system, I wouldn't be worried

[@ibenglish]

@@StarrTile just set the backer to the lip then? This is my first bathroom remodel and I really want to do it right. Thank you

[@StarrTile]

@ibenglish yes... material that you're using and that you are mitigating the bottom with redgard makes it ok... just think like water and you will be okay

[@ibenglish]

@@StarrTile thanks 👍🏻

[@carlosibarra2645]

How is the ground going to stay in the 1 inch space from the tub and board, pleas let me know your thoughts.

[@sethdewey2121]

How would this method work for a glue on tub surround? Do you take the tub surround all the way down or come up some then caulk?

[@foggymtnbreakdown]

If you had the time, like a DIYer, you could always paint a liquid waterproofing membrane (Red Guard, Aqua Defense, etc.) on the bottom edge of the wall material BEFORE you screw it to the studs. I also coat a few inches on the back side of the wall material with the liquid membrane. No wicking in that case, no matter where you put the wall material, but I still don't put the wall material on the tub deck. StarrTile would say that I am being redundant, but that is OK, because this is the area where the failures always occur. Don't let the wicking even begin.

[@Bbbbbbbbbbb-f1w]

I do the same thing👍

[@12thDecember]

That's a great idea. This is why I _always_ read the comments, because that's how you learn some extra tips and tricks.

[@joedean9834]

Red guard should be applied on the whole shower surround. Water goes through tile and grout. Red guard waterproofs your shower

[@Clickumentary]

Glad I watched your whole video.. my decision is made. I was waffling on whether to shim out studs to bring the hardibacker over the lip. The "expert" at Floor and Decor store gave me grief about my decision to bring down to the top of the lip, suggesting the tile would fail. I'm definitely going to tape and thinset the gap and use waterproofing before tiling. Thinking Mapei Aqua defense. Thanks!

[@christianparks3370]

So I tiled my own tub shower a few months ago(it was my first one). The job turned out pretty descent, but I did put the hardiback a quarter of inch above the edge. I wish I would have watched your video first. Even so, I'm not that concerned about it because 1, it is hardiback, and 2 I put three cotes of Redguard on all of the Hardiback. But we will see if it lasts more than 10 years. Oh well, lessoned learned. Thanks for your videos.

[@np1000]

I followed your technique for showwer install and left that 3/8 inch gap at the bottom and red guarded it all so the water will seep out. Makes so much sense.

[@roady1710]

If there's a possible question you can answer this might be a good one one to think about after my Gold board is up around the tub I didn't want to use grout I didn't want to mess with the saw for ceramic 12x12 squares I was looking at a good adhesion on the go board and a good Armstrong type floor tile easier to go around and cut in tight places and for the three handle fixtures but afterwards could I paint or spray a sealant of some kind over the tile or go in between each 12x12 tile with a sealant where they butt up against each other....?? Thanks

[@M.Jsmile]

Thank you for this video. Never could understand others cuz they would point to nothing specific or shaky camera or bad angle . what kinda material would you put on a shower ceiling that will be tiled? Most videos show walls and floor not the ceiling. Thanks

[@christopherd7922]

Hardie Backer suggest keeping an 1/8' gap everywhere. With that being said would you keep it an 1/8'' above the lip? How do you waterproof that area between the top on the lip and the board? I saw other videos where they used a stick on ice and watershield what are your thoughts on that?

[@StarrTile]

Having an 1/8 gap isn't a bad idea... there always be slight movement with material... and yes you could fill in that Gap with something so it makes it easier to waterproof but honestly if you're getting that much water onto your wall you're doing something wrong to begin with. The biggest issue with having your wallboard touching the edge is wicking of moisture into your wall board, if it's raised above the edge to the lip then you're not going to have any problems.

[@patricekornickey4238]

OMGGGGG! THANK YOU!!!!! I watched a video you showed and I was about to make that terrible mistake! Thank you!

[@SherryLaJaunie]

I have an old house so there is tongue in groove wood behind what I pulled down. This means I have to place the wallboard onto the lip of the bathtub. Is there anything I can do to help protect it besides the placement?

[@thomaskowalski9251]

what do you do at the seam where two manufactured edges of drywall come together. that would create a valley right. Mud? thinset? before you put on the waterproofing?

[@StarrTile]

If it iis Sheetrock then I use sheetrock mud, if I use cement backer board then yes it would be thinset, and then waterproof

[@chains6558]

Im going to install a Jetcoat shower wall kit , should I still go to the top of the flange with my green drywall ?

[@brandong.1857]

Interesting glad I've learned about Cement board wicking up water! Thanks

[@Mattg1616]

I just installed a swanstone shower pan and the instructions actually say to even leave a 1/8inch gap between the lip and backerboard (or whatever you use). makes sens but i dont understand why the studs dont get wet. how far down do the tiles come? is that part of the tile basically free floating? do you seal the bottom of the tile/tub connection?

[@bryanpeart]

Amazing video sir. I love how you used everybody else's videos on the boobtube too.

[@thomassligar812]

Hi, what if I am doing a glue on tub surround. My problem is that the front of my greenboard sticks out further than the tub flange. The plastic tub surround allows a lot of flex making it almost impossible to caulk. Should I fill it in with caulking prior to give the surround something to push against. Thank you!

[@smitlag]

I follow your methods but introduce an extra step which only takes a few minutes. Before mounting the green board or cement board , I Red Guard the first 3 inches of the board including the edge on both sides. So not only is the board mounted where you show it, but that edge is sealed

[@HDCrumbsnatcher]

thank you. brillant. gonna do this tomorrow

[@Bbbbbbbbbbb-f1w]

That’s what I do too!

[@jens2763]

I did as well thinking I was being anal. Good to know others do that.. 😆

[@mikelazowsky173]

Amateur question: what is a Red Guard 🤔 ???

[@StarrTile]

Nothing wrong being anal, better that way

[@paulbrezgel7722]

Great Video!!!! Question: How should this be done *at the top* in a full *shower* surround when there's no tile being used? (Only Durock above the shower.) Do you still need to set the Durock ABOVE the lip/flange? If so, what do you use to fill the unsightly gap between the lip and Durock?

[@StarrTile]

Yes even using durock you raise it to lip, fill with nothing... that is sort of the point so your wallboard doesn't absorb any water. You could run some silicone in their but useless. And if you have no tile going to the ceiling then you would not continue with durock, you would transition to sheetrock

[@paulbrezgel7722]

@@StarrTile thanks for your response. If we set it just above the lip, wouldn't the screws that secure the top of the shower surround walls be visible and look hideous? I've never seen exposed screws before in a shower/tub surround. Maybe I'm missing something? Maybe I'm not understanding exactly what you're saying? I'm not sure. Anyhow, I do appreciate your time and help with this.

[@StarrTile]

Your tile will overlap the lip and come down to the edge, I don't see how screws would be showing at that point

[@paulbrezgel7722]

@@StarrTile there won't be any tile. It's one of those Delta Shower Surround setups. Pan and 3 walls. Maybe that's where I miscommunicated/mentioned the wrong type of board to use. Everything above the shower unit will match [hopefully] the rest of the drywall in the bathroom. Again, no tile for this job.

[@Mogman150]

@@StarrTile In a shower stall situation where there is drywall above the the stall, you will in fact see the screws that hold the stall in place unless you 1) extend the drywall over the screws/lip, or 2) fill/cover with a ton of caulk

[@mloaiza770]

M Loaiza I am going to add a small bathroom in an existing bedroom. I'm hesitant to remove the ceiling drywall because of the insulation that was blown in. Will it work if I just put green board over the ceiling regular drywall ? Thank you

[@davidphu7403]

Is it ok to leave 1/4 inch over the lip? A guy at Lowe’s to leave 1/2’ over the lip. That’s a little too much i think.Thanks for the video. Glad i bumped into it

[@cmag6581]

Like the video, so when laying bottom run do you apply thin set in the 3/4 gap between tub and durarock or just on the rock or whatever wallboard your using?

[@StarrTile]

Just on the wall board, there's no point in putting thinset on that little three-quarter Gap. Some guys like to fill it with silicone.

[@jeffdyrland2795]

So friggin funny how I watched that exact Sal video right before I watched this one! Haha

[@elipicon5020]

Me too😂😂

[@tgh223]

if u not using tile like me what u fill the gap with from where the green board sits on top of tub ledge to shower panel

[@jimreitenbach6023]

Bob you're right and it makes total sense. Above the lip and leaving a gap. I do block in between each stud for support at the tub lip.

[@mariopaquet1768]

Hey Bob! Im a big fan. I just HAD to go and check how my bathtub was set. I didn’t built it. It’s probably 7-10 years old. Maybe more. The results? My tub doesn’t have a lip! It’s squared. So the drywall had to be set on top of it. The results is not too bad. So i guess it’s both techniques. Or neither. I DO have to keep a healthy bead of silicone around the tub. As always. If i ever do this job, I’ll defenitly set it like you do. Cheers Sir!

[@chrishuskey1459]

Thanks . Very helpful . I'm using solid surface (corian) for walls . I'm now going to put a thin strip of solid surface on the edge, then the wall board on top of the strip . This might work with other waterproof materials creating another waterproof barrier to prevent wicking.

[@michaelreilly3347]

What you are saying about how the board should be on top of the lip is absolutely right. It is the best practice, however, in my opinion it is not the splashing from below that causes this damage. The reason the caulking shows mold and mildew and the wall board fails and wicks up water is because of the caulk itself. Any moisture that wicks through the grout work in the tiles above (because very few people actually continue to seal tiles after the initial install) will work its way down the waterproofing layer to the bottom where it gets trapped by the caulk. It just sits there and festers and soaks everything. The mildew in the caulk keeps coming back because it is permeating through from the backside. The absolute best way to solve this almost no one ever does. Don't caulk the seam. Allow moisture to escape and the materials to dry.

[@justice4all32]

So it was about the design of the tub, not necessarily where you place your backboard?

[@peaceoutpeaceout4267]

how do you finish off the seam between the moisture board(cement board) and the tub lip. On my tub the cement board over laps the lip so there is a gap between it and the tub edge. Do I fill it with thinset, or mud? then embed the tape ....then finish off the top with thinset?

[@SPUDWRENCH]

I’ve video’d my brains out on how to set the wallboard. I’ve seen it on the lip, a tad above the lip and some installs show on the tub/shower edge completely. This guy makes the most sense. Once the wallboard is up, whether concrete board or green board it should be on top of the flange. When tiling, tape off approximately where the tile face will be to not scratch the fiberglass or enamel finish. Then set tile as normal. There’s only going to be maybe 1/2” void, so not to worry about the tile not bonding. Hope this helps. Avoid filling the gap with anything that might allow water to wick upwards. I’ve seen where some guys have used standard drywall fill and tape to bring the surfaces flush for tiling, but I’m not sold on that. Water and water based products don’t seem to be compatible.

[@peaceoutpeaceout4267]

@@SPUDWRENCH Thanks...yes this guy makes a lot of sense to me...

[@edwardrigby883]

Hello, Enjoyed your video. It was very helpful. My question is if I place my green colored wallboard on the top of the lip of the tub and I don’t plan to tile the wall then how do I cover the tub flange that is used to fasten the tub to the wall studs? Thanks.

[@StarrTile]

I have never heard of wallboard in a tub shower combo without tile, you're asking for a problem in the first month... it's not the first week

[@laurikennedy3147]

This little kzbin.infoUgkxVoi3B4CB6Oygq1-vo4OTL1M_M5JkrXif tub works perfect in our 6 x 6 shower and is easy to get in and out. Also easy to drain.

[@nickw.2345]

Okay this makes alot of sense, but if you are not tiling the top portion of the shower/tub unit and you want it painted and to have the finished look without the screws holding the lip to the 2x4s showing how would you suggest hiding those?

[@LVVideoGuy]

Do you recommend adding "nailer" pieces between the studs so that the backer board has something solid to be attached too??

[@StarrTile]

Not really because gypsum is rigid enough on it's own

[@georgeperez2592]

I'm getting ready to waterproof and tile. Drywall is sitting on top of lip but shower pan lip is 3/16 proud of the drywall. Should I build up mud so tile can sit above edge with 1/8 gap for caulk?

[@rll1971]

Thanks! I almost made the mistake of overlapping the lip by following YT “gurus”. Kudos to you for presenting the evidence I needed to avoid making a huge mistake.

[@XCBen]

Both methods work. You just have to do them both correctly

[@loriphelps6301]

I have a 5/8” gap from the tile to the tub. There is NOTHING from the tub and tile. I can’t possibly caulk that much of a void. I have no structure to grout to. Should I fill the gap with backer rod to eat up some of the space and caulk?

[@frankmollegaard1989]

Your method is consistent with American Standard tubs installation guide. ie set your cement board on the lip or 1/16 " above the lip of the tub and overlap the tile down to the tub edge leaving a slight gap. My question is how does the grout work when overlapping the tile like that. To me the grout is going to squeeze out into the gap behind the tile.

[@12thDecember]

I don't know who else does this, or whether Bob agrees, but I _think_ the Home Renovision guy uses thinset to fill in that space between the tile and the tub that isn't covered by backer board. So when that sets, it will prevent the grout when you apply it from squeezing out. Hope that makes sense.

[@dougl945]

I always install above lip, on green drywall. Never ever a water problem or mold. I can after 25 years of use.

[@MissTriciaMilitia]

What would you suggest to deal with a side of the shower pan where we had to chisel out the studs to accommodate the bottom lip (as is shown to your left in the shower pan at 10:40 in the video. I think we should just leave a space and the thinset will fill it in, it's only the very bottom of the tiles so it should be fine I think, but I would LOVE your opinion!

[@Robert-bm5fz]

am i guessing unless you silicone the backside of the drywall at the lip?

[@N-V-B]

Great video! So if I run my 1/2" cement board to the lip, what do you recommend for my tile transition at the edge? Do you stop the tile at bottom of cement board or run below? Do you run any thinset or hydroban between bottom of cement board to top of edge? Just want to be sure everything is well prepped.... Thank you!

[@kyleorr533]

I would think you run the tile below the cement board all the way to the tub and leave a small gap…1/16 to 1/8 inch for the the grout caulking. That’s what he meant by 10-15% of the tile with no contact…it’s not touching the fiberglass flange but floating on top of it all the way to the base where it is then grout caulked. So essentially, there is a very small void behind the bottom half inch or so of the tile. This prevents/limits moisture from wicking up your substrate over time. Tile isn’t porous so moisture won’t travel up it. I’ve even seen a video of a guy putting window tape flashing on half the flange and then the rest up the studs (only goes up the stud a foot or so). I’ll probably do this but definitely won’t put the substrate touching the shower base. The installation instructions even have it as this video describes.

[@situatedillness]

put mesh tape on the joint, then use thinset to fill the gap or set that tape, do that to all your joints, then use a roll on water proofing membrane and do like 3 coats. Then tile, leave 1/8 or whatever your groutliine thickness is from the tile to the tub and you're good to go.

[@ekp8525]

@@kyleorr533 +1 for the window flashing method. I saw the same video and really liked that idea.

[@7628739]

I agree, this kicks ass method works the lip can use caulking at the bottom tile stops 1/8 inch or so from tub. Could you full the bottom gap before the tile goes on the wall? To add an additional layer if protection?

[@andrewalli5792]

I have one wall where the dry wall will sit a bit proud (towards the center of the tub) on one side. Is that ok? I know the ideal alignment would be flush to the flange.

[@vito7782]

Hi question. My backer board not flush with the shower base flange, board is bit thicker than flange. Joints and corners are done. What do i do in this situation

[@josephlamb2510]

I’m installing RV tub and tub glue on tub surround, is install of backer board different? There won’t be tile to cover lip of tub.

[@StarrTile]

I wish I could answer that for you but I have no clue on installing anything in an RV just because of the movement thing, but common sense and critical thinking should get you through

[@roady1710]

Just watched your video home built in 1960 have a steel tub doing a bathroom remodel as we speak was thinking first working with go board which seems to be a good product but was originally going to take it over the edge good advice going to go to the lip all makes sense when you think about it the tub manufacturer built that lip so there was nothing to worry about for water leaks basically a built-in pool liner thanks for this great piece of advice

[@Feelstoramusic]

I've even heard there should be a 1/4th" gap between the lip and the cement board. Would that be better than even setting it on the lip directly?

[@AmEricanPoetics]

@starrtile, what happens when the contractor installed the tub in front of the drywall and did not screw the flange into the studs. Do I need to have the tub and drywall taken out and redo it?

[@StarrTile]

Well my take on it is if there's no problem then there's no solution, I probably wouldn't do anything if you didn't have to until a possible problem arose. I mean true enough it was done incorrectly but the damage that could possibly occur is a bit minimal and there's no point in doing something over until and unless you have an issue.

[@saskchauchtv7417]

Getting ready to install a shower pan. I have watched a few of your videos as far as the placement of the wallboard goes. If using durock, do you suggest taping and thin setting the transition from pan lip to wall board? Or just overlapping the tile into the pan?

[@StarrTile]

Just overlap tile

[@tonester1964]

Hello. I bought a glue on tub surround shower wall. My substrate will be cement board. When setting the wall, what do you recommend for the bottom? Since the shower wall is a thin construction, what can I do where the bottom meets the meets the tub? I was planning to use mesh tape and thinset to finish the gap and provide some 'body' for the wall to paste onto. Another question that's related is how to finish the edge of the shower wall (I didn't consider it before). Would a tile edge work? I feel tile wouldn't give a consistent look. Thanks in advance.

[@iviaverick52]

I prefer the method of using flashing tape on the lip, up along the studs, running behind cement board, with the cement board sitting on the lip as you mentioned, then redgard on everything. The flashing tape may be overkill, but it never hurts to be cautious.

[@zackje1]

Mr. Doyle, do you have a video of this job or another similar start to finish? Thank you sir.

[@StarrTile]

I don't recall that I have any video of setting wallboard and tile on a tub, if I do I don't remember, I've been on KZbin now for 12 years

[@zackje1]

Thank you.

[@TwoTracksOutdoors]

So, Bob, your arguments for cement board being placed on or above the lip, certainly make sense. Throughout all of your videos, you have certainly now driven this good point home. I take it by your foam comment, then, that you could set styro foam wallboard directly on the edge, whether it be a tub or shower bed But, would you?? Even using styrofoam on your walls, though, I would imagine you would still lay your floor tile first, then the wall tile. After watching so many of your videos about elevating the wall panels to avoid water problems, I would probably elevate the foam panels, as well, unless you say otherwise. Good video.

[@StarrTile]

I have rarely used foam panels for my shower builds, but yes I would probably by habit still raise them above the floor, although it's innocuous because foam won't wick up water the way everything else will.... for a tub application like seen on the video I have no compunction about setting it on the edge rather than the lip if it's foam.

[@TwoTracksOutdoors]

@@StarrTile Much obliged, Bob. Love your videos. Sure wish that Google would find a heart and re-monetize your channel. Just made a small Pay Pal donation to show my appreciation for your videos. Just like Justin below, your link didn't work for me, so took your suggestion, went to your main page and found the PayPal icon link.

[@StarrTile]

@@TwoTracksOutdoors you and me both, if they would remonetize me I would stop begging for money 😂😂😂😂

[@whattheschmidt]

I just want to put my plan here (doing this in a week) on my tub, I have the Kerdi Board, I will cut out the back 1/4" of the bottom 1/2" of the board and have that go over the flange of my tub. This will still leave a gap, but smaller, and I will use the Kerdi-Fix on the flange to the board meetup in the back. Then I should have more board for my bottom row of my 3x12" tile to fit onto and I believe it will be a cleaner, easier install. Just putting my plan out there since I am using polystyrene board! I think I have done enough research and this is a great plan...

[@garycarr9015]

What can I buy a cheap fix in my own tub between it and the wall I can use liquid nail to put it down not out to impress anyone just keep the water from running down in there and out on to the floor some kind of flexible stuff plastic or rubber vinyl or I was thinking maybe some L shape crown molding any suggestions would be appreciated

[@MissTriciaMilitia]

Great video! We are remodeling the bathrooms after a sewer backup and I was trying to convince my contractor that it didn't make sense to me to shim out the boards. I didn't like that it was sitting down by where there would be water. I had to try to argue that I didn't care that the instructions said to lay it down on the pan, I just wanted to do it the other way anyway. SO GLAD to have some backup to my wish to do it this way!!!

[@matthewsee3745]

I redid a bathroom once......I see the ways I messed up now. What I'm not sure about is what exactly is the process of getting a finished result? If I'm following this video correctly, the tub or shower surround lip gets screwed to the studs. The drywall or cement board gets screwed to the studs about a 1/4" above the tub lip (I love the idea of sealing the edge to prevent water from wicking up). Then add tile and and thin set. Is the bottom row of tiles just supposed to overhang the bottom of the cement board/drywall and sit on the edge of the or is the tile supposed to sit above the edge of the tub but extend past the drywall or cement board? With the difference in the thicknesses of the lip of the tub and the cement board, there will be a tiny gap at the bottom of the bottom row of tiles. Is this that way it SHOULD be? I think I need to see a diagram, but hopefully what I'm saying makes sense and somebody can explain this to me with a bit more detail. What if you are installing a tub surround as I did in my first and only bathroom remodel? The tub surround had a lip on it just like the tub does in this video, but we did not put tile over it. We went straight from drywall over the lip of the surround, and caulked it. I know this is wrong now, I did not know that then. Had we installed drywall above the lip, how do you hide the gap and make the top edge of the shower (bottom edge of drywall) look finished and pretty? Thanks for reading, I hope to get some good answers

[@fabiannino4106]

I just put up the wallboard and did it the right away on top of the lip. Never done one before but it just made sense. Better lucky than good

[@juanperales3351]

Very smart, and very important to learn!

[@502flexlex6]

Do you recommend a rubber flashing tape strip around the lip before setting backer board on the lip?

[@StarrTile]

I don't think it's necessary, you could do it if you want to but the point is not to allow water into your backerboard

[@502flexlex6]

@@StarrTile thanks for the answer!

[@mercedesfoster482]

Wow, thank you for the GREAT information. I am getting ready to install a shower pan and I am going to follow your advice, THANK YOU!!!!

[@Trophybearer]

I finally found a video that explains my question! Do you have a video actually showing this being done? So basically back board on the lip and then the tile stays 1/8” off the edge? Is that correct?

[@damnbigfish]

This seems like sound reasoning, especially with a 4x4 tile or some such. What if you are using 2x6 tiles, or a mosaic? How would you adequately support the tiles past where they contact the backer board? With 2x6 glass tiles, for example, 50% of your tile would be hanging off the backerboard with no support. I wouldn't even know where to begin supporting a mosaic overhang. Any thoughts?

[@StarrTile]

There are many ways to overcome that, in the Tile World there are no problems only solutions, what I would probably do is put up a piece of quarter inch backer into that Gap that's already been waterproofed, silicone it in really well and move on from there, but each project presents specific issues that you overcome when you get to those so there would be a solution ultimately that would work

[@damnbigfish]

@@StarrTile Thanks for the advice! :)

[@brunorios7223]

What about product like densheild? That has fiberglass mat front and back with treated gypsum core?

[@StarrTile]

Yes I love denshield, just hard to come by here in metro Atlanta but I use it when I can

[@brunorios7223]

@@StarrTile does that mean still above lip?

[@StarrTile]

@@brunorios7223 on top of the lip like any other board, even if it was foam

[@raymondjackson6069]

When I put my wallboard up, in some places it is proud of the tub edge, up to 1/4 inch. What do I do with that gap between the bottom tile and the flange of the yub?

[@StarrTile]

Generally speaking set my tile about 1/8 of an inch to the tub and then use grout in that area and or silicone, they even make siliconized colored grout

[@raymondjackson6069]

@@StarrTile Hello, and thanks for the reply. You may have misinterpreted my question. Here is a diagram of what I am doing. Where the tile meets the tub flange, there will be a 1/4 to 3/8 gap behind the tile between the tile and the tub lip. What, if anything would I put back there. Thanks again. Here is a like to my KZbin post about it with the diagram. kzbin.infoUgkxRoZYh4VVolFO_YnnyPz_r2d5VWXpealA

[@kstewart7736]

What about with a fiber glass tub surround should u leave a gap on the wall board?

[@StarrTile]

Yes