French Drain and Foundation Waterproofing System

Matt and Brian talk about Poly-Wall's Arroyo drain board and Bryan walks us through how he does his own French drain system!
Arroyo Drain Board - poly-wall.com/w...
The Builder - Brian Long - www.brianlongcu...
Huge thanks to our sponsors Polywall, Huber, Cosella Dorken, Prosoco, Marvin Windows, Roxul, & DAP for helping to make these videos possible!
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www.Poly-Wall.com
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www.Marvin.com
www.Roxul.com

[@markphilpot4981]

Regardless of the fact this is a high dollar house, that French drain job with all that exterior wall detail insures that basement has a near zero chance of leaking! That is high end work on a high end house! Very good job, first rate! Do it once and do it right!

[@MrCJHamill]

That is an awesome looking French Drain and meticulous attention to detail!

[@josefblumers2702]

Well for 50 years... nothing lasts forever. Great work!

[@NevrrPresntt]

My favorite comment now that i saw somewhere else : Waterproofing takes up only 1% of the construction cost but if not done correctly can be responsible for up to 95% of damages.

[@Tya2019]

😂🤣😅

[@tommydjohnsonjr]

Perfect! I love that there were more than products featured. The step by step process is a great addition to the normal product review. The length of the video was longer, which is perfect because you had great content. I hate a rushed video that leaves me with more questions than answers

[@buildshow]

+tommydjohnsonjr good feedback. Thanks

[@crabkilla]

Yeah! What Tommy said! More details are better.

[@DC.DYNASTY]

Very thorough. I find myself here because I'm first year home inspector. Matt makes great content for me to remain educated about architecture and engineering.

[@BrettTracyRealtor]

In marketing it dkesnt matter how long it takes ro get to your call of action. As long as your copy is good it will keep us reading or watching the video, i love how detailed this is, great video, very i formed more now about product than i once was lol

[@terraedwards1697]

There is so much miss-information on French drains on the Internet but not this, finally someone doing it right, great job!

[@michaelpeila8794]

I love how he non-Ironically said, " If you have 5 million dollars to build a hill country house..." I'll just go drown myself in a french drain system now.

[@melissam0ss]

Michael Peila 🤦‍♀️🏦💰🤷‍♀️

[@Crusader1815]

Gotta go down and get some lottery tickets...

[@DC.DYNASTY]

Lol goals though. I am an home inspector. That's how I found myself here. I laughed on that part too.

[@neverknow69]

They did drop the word French in there. Must be worth 5 mill.

[@allanbranch]

I was hoping the guy in the red shirt would wrestle Matt.

[@buildshow]

+Allan Branch I would lose.

[@KhrishtophePeistophe]

@@buildshow Absolutely Matt. You look like a fairly well built guy, but Dude was Uooge. My money's on the Mountain wearing a Red Shirt

[@siriosstar4789]

I'm not a fan of french drains because of sediment clogging, but i must say , this is one of the best french drain jobs i have ever seen. Very high quality work.

[@4philipp]

That’s why he has the sediment filter fabric burrito to prevent that from happening. As the clean out option if it still happens.

[@erichondel6221]

What happens if the filter fabric clogs? Will the cleanouts help with that? That burrito might one day be water tight.

[@mae2759]

4:31 - if you say "Burrito Wrap" 3 times, French Drain Man will appear.

[@jeesjees2]

In Finland we install the dimples on the inside, because of possible condensation against the cold ground. I guess in a warm and humid climate it's reversed.

[@165Dash]

Very nice. I would add that the only thing that the perf pipe really does is provide a pathway for whatever clean out maintenance activity you do over time. If your geotextile truly keep sediment out of your septic rock, the septic rock “burrito” will be the pathway for any water...not the perf pipe. Imagine your bathtub full of septic rock and a 5’ length of perf pipe at the bottom. Turn the shower on. Is the pipe REALLY doing anything?

[@AaronPlay]

What slope does the French drain need to be on when it’s going around the footer?

[@rhohoho]

*Sets down black dimpled drain pipe and backs away slowly*

[@nicpedia2432]

Yeah...that's all I have used because it's affordable and simple to lay. Oops

[@Joshua79C]

Withe the amount of gravel they are placing on it plus the backfill soil weight of course its doing to crumple, my step dad who i worked for and owned a basement waterproofing company would suggest to the customer which they prefer be it schedule 40 or black corrugated. Most selected the schedule 40 which we ourselves preferred though the black flex is more easily installed. We never had to go fix the ones with the black pipe or even schedule 40 with our warranty service. So to say, its fine to use if your using inside the basement under less than a foot of back-fill and under concrete, but you want to use what he said for deeper drain system or outdoor use the schedule 40.

[@Crusader1815]

@@Joshua79C Forget schedule 40. If we have all this money to burn, use schedule 80 for those drains. We can economize by leaving the marble off the walls in the maid's quarters...

[@TheFantamos]

@@Crusader1815 At what schedule do we start losing children in our drainage system?

[@1goblingreen404]

I am really impressed by Brian's methods. Bombproof. Very attentive to detail. Great job buddy. BTW, were you ever a pro-wrestler? You should have been.

[@ricos4700]

Reminds of strong man Bill Kazmir. Great waterproofing. 👍

[@jezza6575]

Man Matt, that dude makes you look tiny...he is a mountain!

[@homefront3162]

Jeremy Eisenhut High BP

[@thelankyjim]

Great video would love to see more on a remodel version of this...buying in CO. Looking at how to improve house, add Radon mitigation, waterproof and condition attic and crawl space...

[@spikes1529]

That is exactly how i did my basement waterproofing, but i did a 10ft setback all crushed rock all the way up.

[@dovidpomerantz1884]

Thank for the great videos. Qustion, what about underground water coming up and soaking through your foundation slab? Have you done any protection for that and is that an issue at all?

[@jesuspena2160]

They didn't say, but that is why they have two drains in the pit. One for water coming from below and one for water coming from above.

[@Ariccio123]

Some day I wanna see someone weld a giant stainless steel bathtub around the foundation wall/floor. Ain't no way water is getting through that.

[@sorconsbuildingmaterialsin2014]

Dimple membranes called as drainage sheet are one of the most versatile and effective materials for waterproofing of the buildings. It is (HDPE) High Density Polyethilen based and provides speed in your construction projects, sustainability and environment friendly solution.

[@bradmitchell4936]

This was first invented and used in Holland called playton the dimples go against the basement walls running just above grade now here is what most contractors get wrong there is a top open channel piece that goes on top all around the perimeter to allow air in to keep the walls dry. I constantly see just plastic strips used to adhere it to the walls negating the whole concept of the system. Probably done as a cost measure but will never work as intended

[@geneanthes]

Your show is like This Old House on steroids!

[@Community-Action]

This old house with chai tea

[@CynicalDad81]

French drain with clean out!?!?!? Badass.

[@paulmazurek3306]

Cynical Texas Dad have access to any drain is a goof practice

[@letsdanceonhere]

Dang it! Why didn’t I think of that?

[@marlboromatt5656]

I’ve put clean outs I. All my French drains for the last 25 years

[@AStanton1966]

If nothing else, air moves water. So there should be a breather pipe going to the surface to allow air to push the water through the system. Otherwise you get a thermos bottle effect. In addition, if the downspouts from the gutters are connected to the drain, you need even more air.

[@macrapidito1]

Some French drain installers suggest not to wrap the pipes with fabric even if the fabric is non woven. 🤷🏻‍♂️🤷🏻‍♂️

[@starleyshelton2245]

Water is moving to the pipe as path of least resistance. Sediment and plain mud would travel in without the fabric to filter. Without fabric mud will move with the stream flow towards the pipe. Can't see any other possible outcome. Fabric may allow fine particles but they would be small enough to flush through.

[@nathanspeth9576]

This is typical foundation drainage in commercial projects. Great residential application. The excavation looked a little sketchy. I wouldn't want to be sandwiched between a foundation wall and a 6 foot unshored excavation.

[@ohiomack]

Fuck now I gotta get my buddy to help me do some serious work

[@THE-AIDEN-PROJECT]

Haha this is what I said a couple of weeks ago 😂

[@PlayingManMade]

I really like the cleanout idea and this system! Thank you! The only question I have is about the french drain holes. You mentioned that the caliche soil is very fine so you protected the top of the drain with layers of rock and filter fabric, but what about the bottom, where the actual holes are? You only have a single layer of filter fabric between the ground and the holes. If the holes are facing up, you have all that protection above it. I understand most water will come from the top down, but any water working up from the ground and any standing water around the filter fabric at the very bottom could eventually compromise that single layer, inviting that caliche soil in, right? Also, all that weight of the rock and earth on top seems like it would push those holes extremely tight against the ground, possibly eventually sealing them off with built-up soil and dust from the rock. Why make the water fight to get in the holes? I've heard the arguments for holes facing up and down, but I think holes on both sides are the best idea, especially in this case. Thanks for the video!

[@Nathan-mn2br]

at 4:08 & 5:15 you can see the filter fabric right underneath the french drain is on a compacted bed of septic rock. Maybe they're hoping the sediments won't travel upwards along with the water, but yes I'd think over time sediments would migrate and build up in that unfiltered bed. My understanding is you want the rock bed within the fabric so the pipe is protected on all sides. Brian's description of "the burrito" with multiple layers of fabric and rock and more fabric and more rock was pretty confusing, so maybe I don't understand. A diagram would've been nice.

[@1806StoneHouse]

Ohh La La!! I’m going to retro fit this on my 1806 stone house! Thanks Matt!

[@Padoinky]

I truly miss the luxury of having a walk-out basement - here in Dallas, basements are few and far between, which is unfortunate, as a basement offers a nice controlled environment that comes in handy during the sweltering 100+ degree summers, as well as offering storm-cellar safety during the frequent spring storms

[@Recklessdigging]

Here is how to make the best French drain system ever. Tools needed for this job. Block saw, brush, drill, hammer, shovels, and a rake. First step is to find where water is coming into the house. On this house where the block meets the slab had a gap. I filled it with water proof epoxy. Let dry then put black tar base water proofing over it and also put it along the block where it meets the footer. Put pipe down and cover up. Always make sure the pipe is going down hill so water will fall.

[@breebw]

Wow. this is great. I love the dedication to doing things right. The guy Bryan obviously knows his stuff.

[@joshuasmith1215]

What if you want to insulate your basement with rigid foam on the exterior? What's the best way to go about that when you have the dimple mat?

[@joeziahbabb]

I believe the "killer french drain" was the most efficient and ubiquitous execution device during le revolution.

[@pablo4youtube]

I see what you did there ... :-)

[@liberty5677]

"...especially if you have 5 million dollars to build a hill country house."

[@kreteman777]

Now show an affordable option for NORMAL people.

[@4philipp]

kreteman777 normal people don’t build homes. They buy them from developers.

[@kreteman777]

@@4philipp What the hell makes you think that? It's BULLSHIT YOU CLOWN.

[@beefcakesasquatch6608]

Lmao, "especially if you have 5 million". Ha!

[@ArthurDentZaphodBeeb]

I'd skip the liquid waterproofing (ironically, you can see a ton of bubbles trapped behind the material. He had his crews patching those that had already burst, but there were thousands more that will burst once the weight of the backfill is applied, making the product a costly waste of time). I'd use the dimple mat drain, Sched 40 pipe, cleanouts and backfill with a generous width of CLEAN drain rock. I don't particularly like his burrito system - even clean drain rock has some fines that could clog the pipe, but it;s better than nothing. If I wanted bullet-proof, I'd use Xypex on the walls - it will stop leaks from the inside under hydrostatic pressure because it molecularly bonds inside the concrete itself.

[@rluna327]

Did Brian say PVC schedule 40 pipe is "green" at 5:40? Better check that. It's made from petroleum, isn't generally considered recyclable, and has lead, phthalate, VOC, dioxin and chlorine issues. Otherwise, nice work.

[@WillN2Go1]

The weep holes go on the bottom because everything down there is denser than water, this helps keep dirt from entering, and filling up, the pipe. At least this is how my father explained it. Has anyone dug up an old one of these? How did it do? ( I also think Bryan is right about using schedule 40 instead of that soft stuff. That soft stuff is just going to flatten into uselessness.)

[@Poncho758]

You guys are unbelievable the best I just learned so much from you guys

[@TherealEggiejr]

Did he just call you Ben??

[@AF-O6]

This is invaluable information. You excel at finding the best builders and subs.

[@buildshow]

+AF-O6 thanks buddy. Brian is a great builder indeed!

[@northavealum]

@@buildshow the only problems with this, otherwise great, video is that he Brian didn't address why he is installing two pipes (you asked but he didn't answer), and the video rushes through the final stages of installation after he lays down the first layer of rock and folds over the outer edge of the geotex material - but only a foot or two from the outer edge. I'd like to see a more detailed view of how he finishes out the wrapping of the geotex and additional layers of rock. Can you supplement this video or just post info on the exact details of finishing off the drain.

[@btarb242]

@@northavealum I initially planned 2 pipes just to be 'overkill' but 2nd guessed myself out of it. I theorized that if you use pipes or upgrade to a 6" pipe then you slow the water flow, which may allow silt to settle in the pipe sooner.

[@jamesfarnham1976]

Good grief, get a room!

[@johannesutz6639]

In Germany, where I live, this is the code since the 90s

[@AllAccessConstruction]

I agree with this drainage system 💯 percent. Why because it's pretty much how we do ours... 😅 😅 😅 #sdr35 pipe... Letters up... No black rigid pipe... #yeahbuddy 💪🏾💪🏾💪🏾

[@DJaquithFL]

I like this 10X over any ICF. He needs to buy stock in that vinyl spray company now.

[@RobertSelberg]

This looks like the drainage installs made in Sweden in the 70s. The drainage pipes aren't below the house foundation and makes it possible for the concrete to suck water. The plastic wrap around the house looks pretty much like the infamous swedish product "platon" with some modifications. The blue goo makes it impossible for the ground water that have been sucked up in the walls to escape out, so the only way is to dry to the inside of the wall which will make damages inside the building. Take a look at "isodrän" or "pordrän" for superior swedish drainage systems which solved these problems in the 80s.

[@02dag32]

And the platon is supposed to have the nipples towards the wall, making it breath. No blue goo is necessary, and as you states it will close the moisture inside the wall. The rocks and the pipes needs to be below the slab to drain the water away or else this is a recipe for disaster. I am glad I am not the owner of this house.

[@dagit11]

Hopefully, grading the landscape away from the house will keep the water from ever hitting the foundation and the drain tile at all. Drain tile is only for heavy precipitation (10-year events).

[@bigern3157]

Excellent. Thank you for your insights.

[@sarabjeet29]

Currently doing my research for basement waterproofing. Your comment is quite helpful. Do weep holes help in draining water that is sucked up by concrete ? I would think not but half a dozen masonary contractors and waterproofing experts could not provide a clear scientific answer.

[@tad3900]

Bulletproof foundation drains, bravo.

[@hock929]

I thought I heard Ben as well. I went back and listened I think he said thanks man

[@jbossnack]

He's like Hulk Hogan sounds like he's an awesome builder too

[@bgt63]

"It's the missing LaRue!"

[@tylerstorer287]

Super dope...need that in Portland....great vid

[@VertigoGTI]

Liking the FD system, I did something similar in 12/17 after being fed up with 2"-3" of water in the basement every time we got a heavy rain. FD was set 7' away from foundation, 6.5' deep (about a foot lower than the floor of the basement). 62' was cleared and 3 tunnels were done (driveway, walkway, water/sewage/gas lines). A $600 budget kept me from using adhesive, had to use fabric anchors every 18" to wrap up the burrito. True test was on 8/17/18 when we got over 5" of rain in a day, which would've resulted in at least 4" in the basement last year. Not a single drop this year.

[@lifeisgood070]

How did you do it for $600? Man I spent like $1500. I had to do like 300ft of it. Did you not use gravel? My gravel cost was like $450 alone - 10 tons.

[@VertigoGTI]

Nope, I used 1" gravel. I went up with a truck and got it for about $100 after tax. The delivery for the gravel cost more then the gravel itself, so I saved a bunch there. Perf pipe and caps were $90, fabric and anchors were $55. Mini excavator for 1 day was $200 Dingo to backfill was $150. Lowes online coupons saved me $30 and tool rental coupons saved me another $40. Did it all in a weekend with no labor, so I didn't need to buy beer for anyone except for me. :)

[@lifeisgood070]

Nice work.

[@VertigoGTI]

It also took a month of planning. Not exactly speedy, but a 60 hour work week really dragged out the research and design time.

[@jheissjr]

Can you elaborate how you dug the tunnels. Did you dig them by hand? How long was the tunnel for the driveway? Were they big enough to walk in and set the pipe?

[@timboyd3326]

Nice to see a contractor that knows his s***

[@donready119]

I have not heard from other builders about corrugated black drainage pipe collapsing. I have tile drains in my farm fields that are 40 years old. The ones I dug up are good. Granted, they are only 3-4 feet deep but I have 10 miles of them.

[@gotrob03]

What weight fabric do you recommend for a french drain?

[@wingking077]

Best advice I have when looking to buy a home; buy the one on top of the hill

I used a product called Form-a-drain to make the footings for my house. It's a rectangular french drain piping system that also acts as a form.

[@luke9822]

I like that concept. Why not use the form as the drain tile, right? How does it work as a waterproofing layer and keeping hydrostatic pressure off the foundation for constantly wet earth?

[@FRENCHDRAINMAN]

Seeking permission to direct our viewers to this particular video it supports our philosophies.

[@henaseaable]

I love your videos I live in Idaho now but grew up in Macomb County I sent your information to my family for any french drain work You should open up your videos To comments. You have a great Channel and no-nonsense approach the French drains and how to do it right

[@michaelhowell8990]

French Drain Man - would you put the high octane on top of the footer, or at the bottom of the footer?

[@95thousandroses]

Impressive. Brian doesn't play around.

[@buildshow]

+95thousandroses agreed

[@ruffchem1]

Aren't the dimples supposed to face in?

[@MinamiSen]

Our house is built in the 1940s and the french drains needed to be repaired since we are seeing some dirt coming into the drain. However, we don't where the french drain goes or if there is any layout plan for it ever exists since the house if very old? Where should we start,? Should we talk to the landscaping company or plumbing company instead? Thanks for your help.

[@gensuave1]

I figure he's saying, "Oh! Thanks, man." But at 6:36 it sure sounds a lot like he's calling Matt, BEN!

[@williamgilbert2522]

4 inch corrugated flexes, sch 40 cracks, also your drain is sitting on top of footing with no slope. Dimple mat should go over footing as well and pipe should be placed on top of dimple mat, for collection of ground water penetrating underneath footing

[@davidan6585]

Excellent video. I tried myself in my house and the results were fantastic!

[@mp-sv2cp]

That Builder quoted us 889,000 for a remodel. Got it done for under 200k. Evan artist they are

[@mightyantbuilds8578]

Awesome video. After 2 layers of septic rock, is that back filled with dirt or does the rock come all the way up to the grade?

[@vs12able]

Hi Matt can you give me details of this system and if they will work in New England and if the company has installers in the boston area.

[@Gio-ue8ps]

This guy Matt’s talking to is doing it legit. Also with the clean outs you can go back into it. A lot of contractors are bone heads & don’t plan for the future.

[@MaDGriZz78]

The system makes sense but correct me if I'm wrong shouldn't the pvc sit on top of stone not directly on the bottom of the filter fabric?

[@ronsmith7739]

If I had 5 Million Dollars I would have 2 or 3 good looking women and well, you know..........

[@benjaminpohl]

Schedule 40 should be code. The cheap corrugated drain pipe won't last.

[@eagl3ye]

This is probably a pretty small investment with potential huge returns for a house that expensive.

[@Thoracius]

Any tips on applying dimpled membrane around plumbing that penetrates the foundation wall? Currently adding a french drain to my 80-year old house. My water intake is 3.5ft down in the middle of the wall). Do I just need to cut the dimplemat vertically? Do you do anything about the seam?

[@blackacreage4868]

What is that “2200” caulking? Is that just silicone DAP?

[@U2Berror]

What a great product and process of installation.

[@ArthurDentZaphodBeeb]

Cleanouts are a good idea (and quality builders do that as a matter of course), but need to use long-sweep fittings to allow the snake to work - don't see that on the cleanout riser pipe.

[@MW-gh1mo]

Yep, odd that for 5 million dollars he doesn't know about a detail like that.

[@nevermind8694]

Brian looks like the crews backhoe tractor if it were white skinned it's already got the flat top

[@imthig7374]

Can you do a video on wood foundations? I have a 1990 house with a partial slab / wood foundation house. I want to protect it, but I’m a DIY guy.

[@henaseaable]

I work in the real estate appraisal field and I run into wood foundations in North Dakota . I found a guy that's expert on wood foundations he gave me a website that I can look up if you want it. He repairs dozens of 1970 wood foundations who didn't put enough gravel in.... and he puts in a killer wood Foundation. Henasea@gmail

[@jcon6115]

This is a great system however it would be more effective with the French drain along side the footing verses on top of it. Then sleeves through the footings approximately 10 foot on center to the interior drain tile. I’ve done this literally on hundreds of homes without a failure.

[@luke9822]

I'm pretty sure this system was designed by an engineer and Brian wasn't just shooting from the hip with this design. There is no one way to do something, and many factors are involved, including soil type, that the engineer would need to be accountable for and have equations to back up. I'm sure there are good reasons to put it exactly where it was put, but it would be nice if more of the questions asked in the comments were addressed by Matt and/or his guests.

[@Havoc256]

Enjoy your videos. Great openers. Clean and right to the point.

[@VideoNOLA]

Bryan's not from New Orleans originally, is he?

[@mitkopetrovik259]

This is VERTICAL protection against water, what about insulation below Foundation? The same or similar insulation should be EVERYWHERE around the foundations...

[@michaelvrbanac6923]

Holes down means silt plugging. Need holes down and side or up

[@alexmartonick1028]

That is not code, the pipe needs to sit on a minimum of 2" of gravel: IRC 405.1"Drainage tiles or perforated pipe shall be placed on a minimum of 2 inches (51 mm) of washed gravel or crushed rock..."

[@ikenderova12]

And how do you connect the black pipe of the MiraDrain to the white, Sch40 pipe? Just T-s? And every how many feet do I need to have the black MiraDrain drain pipes in place?? Thank you!

[@1014p]

I ripped out all my 5 gallon buckets that came with the house. Rocks and pipe full of dirt. Instead dean 25 and 50 foot runs of mesh pipe. This I method he does I can see working for a long long time. I still would be concerned dirt washes in.

[@webcompanion]

What are you supposed to do if you're having basement leaking problems and the house is 60 years old? I only have 1 wall that's a problem here in Michigan, and it is on the side of the driveway... which is pitching towards the house now

[@fullnelsondnb]

I have a similiar system in my new construction house unfortunately the French drains went to a "leach pool" or a big pit dug in 8 feet from my house which backed up during record breaking rains after the soil because saturated causing water to get into my finished basement :(.

[@billfromelma]

Hey Matt, awesome video. Great step by step.

[@matetotally]

Does all this external waterproofing create an issue with moisture internally, with the basement walls? i.e. damp. Is that solved by ventilation? Whats a good system?

[@jordybeaups8281]

I'm curious the cost per square foot.. ??

[@RamonaRayTodosSantosBCS]

That’s what I need to do with my choza!

[@brucekelford726]

i am a licence carpenter and i always reserching but his system is great but who can afford it.i also dont beleive in fixing foundation from inside water still in blocks or poured my opinion

[@jamesoncross7494]

That has to be the best system I've ever seen. That must be very expensive.

[@Joshua79C]

Not as expensive as not having one or one that improperly installed like what PLfL is doing wrong in one of their latest video showing how they installed it.

[@augustreil]

PLFL ruined their foundation drain !!!

[@2006gtobob]

It's cost effective if done correctly. It's expensive only if done incorrectly.

[@benarimcdonald]

confused about holes down method... seems to contradict this write-up: www.jlconline.com/how-to/foundations/perforated-pipe-holes-up-or-down_o

[@Braap250]

Typical residential builders: OSHA violation @ 4:41. More than 4 for for vertical excavation. Make sure folks like this have really good insurance before hiring them. They are going to hurt someone.

[@iamengineer2464]

👷Brien The builder sounds like sylvester stallone, who else noticed it?

[@celticcdlblues3819]

It's only works with flat walls though. Older homes that have a rock base that does not work with. Do you have anything for those kind of walls?

[@erichondel6221]

When that filter fabric gets clogged it will become a watertight burrito no freedom drain. Hopefully when it does it can be back flushed using the clean outs.

[@buzboy68]

My house was built in 1989 in Ohio. I have a drain in the floor of my basement. Where would that most likely be going? The sewer or storm drain? Thanks!

[@benlipinski3818]

Yall should be wearing respys with that Sta-Put, even outside. It'll take your first born. Great video Matt, I know it's not your site.

[@lameduck3630]

Waterproofing is a bad idea , eventually it will crack and water will get in but not out - Find a way to let air have access to the walls so they dry naturally.