How to build a warm roof. A step by step guide to the BEST warm roof on YouTube.

[@DeanW-1990]

I just want to say a massive thank you for taking your time out to edit and put such valuable information together so people can learn free education at its finest - your a good bloke 🙏👍

[@Mr_A_Builders]

Ah that's a nice thing to say, Dean. Thank you very much, mate. Hope you're well.

[@Brown969]

Really appreciate the thermal fixing explanation and model. I've used the wafer head screws and you're right, you see them everytime there's a frost and the heat transfers through the screws.

[@Mr_A_Builders]

Well there you go, mate. Every time you can see them in the frost that's heat escaping and simultaneously damaging the roof covering! No worries man! How's things anyway?

[@TheNorthernmunky]

All the videos are awesome. Prefer the long ones mainly coz it keeps me entertained 😊

[@Mr_A_Builders]

Nice one, Logan! Hope you're well mate.

[@gavj8]

Superb video gents. Really appreciate you taking the time to explain this in detail. Been following your videos for a while now and I can honestly say you guys do not cut corners, the care and attention to detail is amazing, like your doing the job on your own home. You have helped an avid self builder massively grow in confidence. Thanks and keep up the great work

[@Mr_A_Builders]

Gav that's great to hear mate. Thank you so much! Hope you continue to watch our stuff, all the best, mate.

[@achobby]

Thank you to you and the team for the videos , every Sunday with out fail I watch and look forward to them Happy birthday also Take care guys

[@Mr_A_Builders]

Thank you mate! Really appreciate your support. All the best, pal.

[@Joe-s2y4m]

Hi, very well explained and built. Exactly how we do it and with the festool saw! We do a few minor different things like 50mm sound proofing rockwool below the deck which has been checked and approved by Kingspan for condensation risk. Which increases u value and makes the roof quieter. We also cut a slight recess in the deck so the warm roof fixings can’t be seen when the roofing cover is laid. Also we don’t build with cavity walls. Our preference is porotherm with external wall insulation. Anyways moving on to the faults I have been told with our roof is apparently we should not be using warm roof fixings with GRP roofs. Plus if we do they must go 40mm into the joist does not include deck or ferrings. Not the case with any other roofing cover. Also at the roofing show the 5 big roofing covering manufactures which include Bauder, Sika, Danosa, Icopal and the others all said tissue based insulation for flat roofs only must be used on top over the VCL and then no ply or osb but the roof covering must go directly onto the insulation board. Indicating warm roofs should not use GRP. GRP companies I am sure would not like this. I have a document which is similar from all these companies as to the physics that mean a warm roof can’t have a osb or ply top deck. So I have wondered if a cement board floor could be used. Then recently due to Grenfell you can’t make a warm roof apparently that does not have a fire certificate. So event though all of the manufactures have a very similar or same looking silver and black sticky VCL (like alutrix 600) simular tissue backed insulation. You have to use all these layers made by the same manufacture as the roof covering to comply with current building regulation as they don’t fire test competitor's simular product and hence only way to get the fire certificate is to use all the materials from one manufacture. So this leaves me confused moving forward as doing it that way would remove GRP roofs and increase costs of materials.

[@LiamLiddy]

Be good to hear a reply to this! Currently confused as to the makeup for a warm roof im about to do on a property of mine

[@Mr_A_Builders]

Hello Liam, hope you're well. If you're in England (I can't speak for any other country) then just follow the steps in the video and you'll be fine. You don't have to use GRP, you can use any roof covering you want. Any doubts then ask your building inspector.

[@LiamLiddy]

@@Mr_A_Builders hi buddy. Yes uk - scunthorpe. It was more the use of foil backed pir with osb above this. Manufacturers advise against it for some reason due to condensation/ deterioration of this top osb. I'm wanting to use it and didn't know if to source a non foil faced pir board to avoid this risk.

[@Mr_A_Builders]

@LiamLiddy Hello mate. If you'd prefer you could send us an email (address is in our bio) with you phone number in and I'll give you a call and we can go through it. May be easier?

[@LiamLiddy]

@@Mr_A_Builders really good of you to offer that! And replying to your comments 👌🏽. If you could tell me where abouts to find the video showing how to set up the diminishing flat roof rafters so I can fall the whole roof to the outlet that would be great!

[@karma3101]

I'm looking at putting asmall 9m x 3m parapet flat roof extension on the back of my house.This video has allayed all the apprehensions I had about this style of roof. Many thanks. True professionals.

[@Mr_A_Builders]

Thank you, Karma...that's not the first time I've said that! Follow these steps and you won't go wrong. Good luck! Thanks again, take care.

[@matthewmabbott6912]

Happy birthday!!! Thanks for yet another well produced, informative video

[@Mr_A_Builders]

Thank you, Matthew! No worries at all. Take care.

[@Retec123]

After reading a few comments on here, I just wanted to try and clarify a couple of points that might help others. I think a lot of confusion stems from the fact that people (and the internet) mix the terms 'Vapour Barrier' and 'Vapour Control'... A vapour barrier will stop both the movement of air (thus being air tight) and any passage of moisture... whereas the vapour control is generally considered air tight (factually it's not) but will allow for the slow passage of moisture vapour. It's all to do with the materials that make up the various products.. for example: if you take a metal pole and call that the vapour barrier and take a wooden pole and call that a vapour control, place both the poles into water as a source of moisture and you will see that the wood will slowly absorb the water (moisture absorption will rise above the water level) whereas the metal pole will not (close enough without going into atom detail). A VCL (Vapour Control Layer) is designed to a slow down the passage of moisture to a controlled level whilst also allowing an acceptable level of air passage as not to affect the warmth of your property. In a warm roof construction, a VCL should always be used on the underside of the insulation. Another common misunderstanding is that when something is labelled as waterproof it doesn't mean that it is also air-proof/air tight.. for example an EPDM rubber roof will stop water/rainfall passage but will allow air passage... thus allowing your warm deck roof to breath, remove the controlled moisture passage from the VCL whilst keeping your house warm and snug.. PS. Great vids.. keep up the good work 👍👍

[@tkthebear984]

Happy Birthday Adam. The Hello Fresh looks lovely and I will have to give it a try 🙂 Cheers dude 👍

[@Mr_A_Builders]

Thank you mate! By all means do, it really is ace! I honestly mean that! Cheers, pal. All the best.

[@w.o.o.d.y]

Happy Birthday Adam. Good video, well presented as usual. Cheers guys.

[@Mr_A_Builders]

Thank you, Woody. Nice one, mate.

[@bikerchrisukk]

Very nice job. I've seen false parapets before, PIR horizontally flush up to external face (over cav insulation) then timber parapet on top. If I find the detail, happy to share.

[@Mr_A_Builders]

Please do mate, our email address is in our bio. Thank you.

[@bikerchrisukk]

@@Mr_A_Builders Will do, be with you in a few mins 👍

[@BarryJacksonBurpo]

Happy Birthday Adam. Great videos, love watching and learning.

[@Mr_A_Builders]

Thank you, Barry. Hope you're well, mate.

[@BarryJacksonBurpo]

I am a Brit from Befordshire now living in San Diego USA. I find looking at UK made videos by you and others keep me in touch wuth the motherland. Also I found laying brick walls in gardens released my stress from work, just like Churchill did. Over here bricks are not popular!

[@Mr_A_Builders]

Wow! How the hell did you get promoted from Bedfordshire to San Diego??? Don't tell me...you married up???!!! Hahaha!!!!

[@BarryJacksonBurpo]

@@Mr_A_Builders Its a long story Adam. I am an electronics eng by training. Had a company in Britain specilaizing in RF engingeering. Sold that to retire to San Diego and be with my US girlfriend of many years. She lived in San Diego and I had been coming here since 1994 on business and got to know her. Now a US citizen, but do miss the UK at times. Had relatives who lived in Ironbridge (owned the fish and chip shop) so your program, and accent are nostalgic for me (many visits to the area and going to West Brom football matches with my cousin). I also am impressed with your work standards, explanations, ethics, and content. Keep up the great work, Best Barry

[@barrydoherty636]

Another great detailed video, well done.

[@Mr_A_Builders]

Nice one, Barry. All the best, mate.

[@jonnyc3216]

If your doing grp finish then I would use 18mm T&G as top substrate… reason being… with grp you need to make sure their are no gaps that resin can flow into underneath the matting…. T&G prevents this from happening. Otherwise you can end up with pin hole sized holes in your grp roof.. alternatively just seal all butt joints on normal 8 by 4 OSB with some sort of sealant. It’s belt and braces for sure but I have seen it happen.. and the pin holes are really hard to find on a warm deck roof… so best be safe..

[@philrogers2406]

Happy Birthday Adam great video

[@Mr_A_Builders]

Thank you, Phil! Appreciate that mate. Hope you're well.

[@Ballymoore999]

Customer is just slowing the job down, surprised he is not standing there watching you 24/7

[@Mr_A_Builders]

I think you've commented on the wrong video, mate.

[@ComeWhatThey]

Happy birthday! Wondering what you think about the theory which says that you ideally shouldn't use a top deck of OSB because it's on the cold side of the roof and more susceptible to condensation and rot. Better to just have the roof covering directly bonded to the insulation. Also heard that foil faced insulation isn't the best thing to use either, because the foil facing acts as a vapor barrier and you only really want one vapour barrier in the system, otherwise you can potentially trap water vapour in the middle of the system. Needs to be hard for water vapour to get in, easy for it to get out.

[@Mr_A_Builders]

Thank you, Ewan. I don't really buy into that to be honest but I'd happily be shown and proved wrong, always willing to learn!!! One of the main issues there is how do you fix the insulation down? We all know that it's not the strongest of materials. Also, the only thing holding your roof covering on is the glue between the PIR and the foil or the fabric type stuff. I won't be charging people for that anytime soon!

[@ComeWhatThey]

@@Mr_A_Builders Where I've seen it done they just seem to use the same thermally broken fixings as you did here, the large "washer" on the top should help spread the load a bit. It's not the strongest, but even in this video you guys are walking around on it without much cause for concern. It's really not that different to the stuff you use under a concrete floor.

[@stepheno2462]

Great video lads. Exactly what I was looking for. All the details. What’s the expected life span on this ? Doing my extension next month and undecided on what type of finish to do on flat roof

[@Mr_A_Builders]

Cheers mate, appreciate that. You'll get 25-30 years out of this, can't see why not!

[@bluewaverenovationsltdpurt8104]

Great video and work. my concern would be air gaps around the fixings when using Grp, as those raised areas would be a bugger to get a perfect seal with resin and matting. What do you think?

[@Mr_A_Builders]

Hello mate, I see your point and it's a valid one, which is why we filled the screw holes in the thermal fixings. When then took special care to work the matting around the fixings for the reasons that you say and it worked great. It's definitely something that you wouldn't be able to do with a rubber roof.

[@bluewaverenovationsltdpurt8104]

Cheers from a Brighton roofer/builder..we do a lot of GRP work.

[@Mr_A_Builders]

@bluewaverenovationsltdpurt8104 no worries man. Hope you're well and busy. Take care.

[@SBODevelopments]

HAPPY BIRTHDAY ADAM !!! 🎉🎉🎉

[@Mr_A_Builders]

Thank you mate! You've always watched and supported us and it's not gone unnoticed or unappreciated, thank you!

[@nicholaswall7677]

Also it seems to me that the most important place in the makeup of the roof components for the VCL vapour control layer is for it to be fitted on the underside of the joists. I have specified SIGA Majrex VCL which has a dual surface that copes with moisture in two different ways, avoiding any problems with interstitial condensation on the underside of the OSB under the GRP/EDPM (this is the most common cause of flat roof failures - not punctures)

[@Mr_A_Builders]

Hello again, Nicholas. Whatever you do, do not put the vapour barrier under the joists for a warm deck. It's a massive no no. Follow the instructions of this video, don't deviate from them and it'll be the best that it can be.

[@nicholaswall7677]

@@Mr_A_Builders Another thing I use to avoid thermal transfer and potential dew point/interstitial condensation issues is custom steel lintels with thermal break pads and fabricated brackets holding a galvanised angle which carries the outer skin. It is a new way to replace the traditional welded plate.

[@MMG_MoonManGuitar]

Happy birthday Adam. Top man

[@Mr_A_Builders]

Moon man!!! Haven't heard from you for a while mate! Hope you're well, pal. All the best.

[@DhanjuSaabuk]

Good job mate

[@victorcoughlan3338]

Great video well explained

[@Mr_A_Builders]

Thank you, Victor. Hope you're well, mate.

[@bilpat5123]

Thanks guys great video.

[@Mr_A_Builders]

No worries, Pat. Thank you for watching.

[@PertinaxPertinax]

Happy Birthday Adam - Nick (Southampton)

[@Mr_A_Builders]

Thank you, Nick (Southampton)! Hope you're well - Adam (Smethwick)

[@TheJbrinks]

sweet. a new video to watch after i watch ep 7. perfect on a crummy rain day/

[@Mr_A_Builders]

Well...it's a bit of a re-edit to give people a better and easier chance to find the information, but we'd appreciate the view if you don't mind! Thank you!

[@TheJbrinks]

@@Mr_A_Builders hell yeah im gonna watch it. love watching my brit boys build some shit.

[@Doug....]

Hello both. 2 questions please. 1) Theres a lot of strand board used on the layers of that roof. Is it a warm roof solely because you need 150 mmm insulation making cold roof impractical. 2) How did you transfer the rafter centres up to the roof 🤔 . Thanks 🙏

[@Mr_A_Builders]

The answer to question two is simply just measure off a fixed point then go underneath and see if you can see a screw poking through, if you can't then you've hit the rafter! As for question 1, it's all about the height of the roof and what you can get away with which we will go through hopefully in the next episode.

[@nickthomas6265]

Great video 👍

[@Mr_A_Builders]

Thank you, Nick. Hope you're well mate.

[@pat_link_]

Happy Birthday Adam 🎉

[@Mr_A_Builders]

Thank you, Pat. Appreciate that, mate. Hope you're well.

[@alansenior5663]

Happy Birthday. 🍻

[@Mr_A_Builders]

Thank you, Alan. I'm having a drink as we speak! All the best, mate.

[@alansenior5663]

@mrabuilders6723 Cheers. All the best.

[@darrenpodger7294]

Great video , just one question, would , 100 mm joists half upper filled with insulation plus11 OSB then a further 70 mm insulation plus another 11mm OSB , the membrane in-between ceiling and joist , thank you in advance

[@marktrower2267]

Happy Belated Birthday Adam 🎂🎂🍾🍾

[@Mr_A_Builders]

Thank you, Mark! Hope you're well mate.

[@dominictinsley2565]

Thanks for another great video. Just started a warm deck today. I’m always confused with the vapor barrier. So it stops all the condensation from the insulation soaking the deck below but what happens to all the moisture? Does it just stay trapped forever? 😆

[@Onhere6381]

Think its to stop moisture from inside the building condensing on the underside of the top deck and rotting it.

[@Mr_A_Builders]

Hello Dom, hope you're well, mate. The vapour barrier is to create an air tight seal from the bottom deck upwards. The whole point of it is so the heat within the room below stays there and can't pass through. That's why we screw through into the rafters, it's to try and maintain the integrity of the vapour barrier and not rely on its "self sealing' properties.

[@Mr_A_Builders]

That's sort of it, mate.

[@datheat2854]

Very good - theory too ✔️

[@Mr_A_Builders]

Cheers, mate.

[@loebas667]

wish you'd have included the top coat instructions, and i wonder if you would have preferred flat or sunken top fixings to all the little bumps?

[@Mr_A_Builders]

All the fibre glass videos are within this series mate. I have to prefer the little bumps because it's the best way to do this type of roof, any other way is thermally inferior.

[@DoctorRetina]

Great vid. If any moisture gets through a screw where you've missed the rafter. Isnt it less desirable for the moisture to gather in the PIR. Moisture significantly reduced the thermal performance of PIR. Could adhesive be a better solution as opposed to screws?

[@ChrisHill-y4k]

Where did you get your insulation fittings from and what size 130mm insulation and 18mm osb?Cheers

[@davidatkinson3336]

How do you cost a job like this. Be nice if you could find the time to explain. Thanks. Keep up the great videos.

[@Mr_A_Builders]

Honest answer...guess!

[@nicholaswall7677]

I may have missed something but have you incorporated a secondary fall in the firrings to ensure the surface water sent down the deck then goes (perpendicular direction) downhill to the outlet?

[@Mr_A_Builders]

Hello Nicholas, yes we have and all that is explained in the previous 2 videos to this one. In those videos you'll see the installation of the diminishing battens and the firring strips. Feel free to check them out. Take care.

[@BroughamBaker]

Got any mates that work on the South Coast? I want a cold roof converted to a warm rood and have no idea who to trust. Pretty on the outside doesn't mean the inside has been done well. I can see you care about both.

[@TheHouseGuyde]

Just out of curiosity, the detail for the timber upstand - does it require vcl internally to prevent mositure laden air from entering into the space. If so, how do you achieve it, is it a simple case of adhering to the inner face of block work and underside of deck around the perimeter?

[@Mr_A_Builders]

Hello, hope you're well. If I've understood the question properly...no. We want the air that's in the room to do one of two things...stay in it by not passing through the vapour/make up of the warm roof, or go through the wall and up into the insulated cavity where the only place that it can meet the cooler air of the outside is the very top of the parapet which is beyond the perimeter of the room thus not being an issue. Does that make sense?

[@malibugrove]

Happy Birthday 🍰🍷🍺

[@Mr_A_Builders]

Thank you! Nice one, mate!

[@stuartgilliland9662]

What about applying the fibreglass? I’d be interested in seeing that part.

[@Mr_A_Builders]

That'll be in our next video, weather permitting it'll feature in this Sunday's episode.

[@stuartgilliland9662]

Super!

[@tomrathbone2198]

Happy Birthday 🎉

[@Mr_A_Builders]

Cheers, Tom!

[@markloughlin3409]

Shocking, having to stipple around every one of those raised fixings is a fibreglass nightmare imagine trying to get them all done on a hot day 😂😂

[@Mr_A_Builders]

Don't do it on a hot day then!

[@lindseyclarkson3791]

Happy Birthday Adam for 30th, which is my Birthday too😁

[@Mr_A_Builders]

Haha! Well there you go! Happy birthday! Hope you had a great day?

[@FONASDeadlock]

Youve sold me on those fixings. What's your thoughts on adding a green roof on top?

[@Mr_A_Builders]

Mate, it's best way to do it of that I'm certain. As for the green roof, do you mean having grass and plants? I'd stay well clear of that mate. Just my personal opinion.

[@o0oLINUSo0o]

​@@Mr_A_Builderscan I ask why you'd steer clear, would it be because of the weight on the roof or something else? Our architect designed us a flat roof with parapet so we could fit modular sedum trays, but they are max 55kg/m2 can I do wonder about whether sagging may occur

[@Mr_A_Builders]

Hello mate. In my opinion it's the weight, the water runoff being compromised, the roots causing damage...I'm sure that all these things are taken into account in a properly designed living roof but those are the things that I think could cause trouble.

[@TMZ-5jr]

My plan is to use a separate primer/self adhesive vapour barrier.

[@Mr_A_Builders]

There's really no need.

[@TMZ-5jr]

Unfortunately i am doing a passivhaus. I’d also recommend 3.4 aircrete blocks instead of thermalites.

[@Mr_A_Builders]

I wish you all the best.

[@amazing451]

😅​@@TMZ-5jr

[@chrisgraham1496]

I want to know if iv installed 150mm kingspan in a warm roof cam I then install 50mm rockwool underneath in tje 9x2 space ? For sound proofing?

[@Mr_A_Builders]

Hello Chris, hope you're well. No, don't do that. Only have the insulation as part of the top deck, nothing in-between. Sound won't be an issue. Thank you for watching.

[@amazing451]

Hi Adam, at point 10min on the video Rich was talking about the fixings being 161mm overall, but the total depth of the insulation and OSB would be 176mm ?

[@Mr_A_Builders]

Hello Kevin. The thermally broken fixings are 100mm and the screws are also 100mm, so over all when it's all clamped down you've got about 190mm. Obviously you can use longer screws providing the heads fit down the shaft of the plastic fixings!

[@rcteryx]

Why didn't you leave an expansion gap between the osb and upstand ? As all GRP manufacturers want this for their warranty

[@hewoguys2506]

good job lads but is there any reason why didnt counter sink themal screws slightly yes no body gonna see it but them screws dont look good on the roof

[@matthewpartridge8784]

Hi, im currently doing a warm flat roof. Ive done ply above firring then alutrix 600 stuck on then 150mm pir then osb 3 then it will be edpm It also says to put a vcl on under the joists (ceiling) before plastboard is this wrong ?

[@Mr_A_Builders]

Hello Matthew, hope you're well. Sounds like you've done a great job! Nice one! You don't need that VCL under the joists, you've already installed one so that's that! Just plasterboard and you're away!

[@matthewpartridge8784]

@mrabuilders6723 Thankyou for your reply thats helpful. The chap whos going to lay the edpm isn't keen on those thermally broken fixings with edpm. Realistically do you think there will be any problems if I just use long screws through the decks, I know alutrix should heal around the screws which should help a little..

[@institorisinstitoris959]

Is it fair to say that you should build classic roof instead of flat roof if you can choose?

[@Mr_A_Builders]

Hmmmm...great question! There's a lot of pros and cons to both! You may have given me an idea for a video......

[@institorisinstitoris959]

@@Mr_A_Builders Well I'd like to watch it so feel free... :-) I'm planning to add an extra floor to my house so with a flat roof it will more or less be the same height but if that is less reliable and far more expensive then classic roof is an option... Gonna subscribe...

[@glen1000000]

Could you use 18mm OSB instead of 11 mm therefore countersink the plastic thermal fixings hense have a flatter deck for the GRP ? Love to hear your thoughts ?

[@Mr_A_Builders]

Hello Glenn. It's not impossible mate, but the heads of the fixings are approx 5mm if not more, definitely not less, and you'll have to go deeper as to have room to fill over them afterwards, so there's not a lot of meat left to confidently fix down to if that makes any sense?

[@Joe-s2y4m]

We do this and use 18mm t&g OSB3. We use a countersink and take out approx 4mm. We thought about filling them in after but have not needed to and you can’t see any fixings. Good idea though to fill fixing hole with foam like they do on this video. But have to agree if you try to do that on 11mm boards you wont have much meat left to confidently fix down. Have to say this video they made is the best one I have seen on here

[@matthew121able]

Happy Birthday

[@Mr_A_Builders]

Thank you, Matthew. Hope you're well, mate.

[@maniv2119]

Wouldnt you need mushroom vents or ventillation in general?

[@Mr_A_Builders]

Absolutely not mate. It needs to be a completely sealed unit.

[@michelleconte8428]

@mrabuilders6723 From everything I understand in researching the topic, using foil insulation can create issues. It will act as as a vapour barrier and will encourage condensation and rotting of the top deck. The VCL you have at the bottom has to be the one keeping the warm moist air within the room envelop, offering maximum control/minimizing the heating bill. Then any vapour that does go above it should be facilitated/encouraged to disperse out. The glue inside the OSB top deck is going against that concept, and so is the foil of the insulation (x2 since you have foil on both sides or 2 additional VCL). I'm not a builder, feel free to correct me if I'm wrong. I'm planning to use tissue faced PIR for my warm roof, and being a sloped roof, I'm just going to skip the entire top deck altogether. Interesting bit about the fixing, these little details are always very appreciated in videos. Thanks for sharing

[@Mr_A_Builders]

Hello Michelle, hope you're well. From what I understand when you say " encourage to disperse out" you're talking about ventilation above the initial vapour barrier? Massive no no. This is a warm deck and should be completely sealed. That's the whole point. The top, deck mechanically fixed, is there to create a solid and secure platform to which your chosen roof covering is installed/glued too. Should you use the issue backed insulation and glue your roof covering to that, you're not glueing to the roof, just the issue. If that issue fails, your whole roof will. That's putting a lot of faith in the adhesive that's sticking tissue to a sheet of PIR. Take my advice, do not do that. Just follow the instructions in this video and you'll be fine. Don't over think it.

[@michelleconte8428]

@@Mr_A_Builders Thanks for your reply. So to clarify my warm roof design is lower deck/VCL/Insulation/breather membrane/batons/counter and shingles. You might want to watch this video, which I find very educational, from a building control lad kzbin.info/www/bejne/i3y2knx5iZyqeac - He referenced BM trada who also does not recommend using timber between VCL and waterproof covering. I could find their 2014 Timber Industry Yearbook on Issuu Dot Com which contains that recommendation, so apparently this has been out for some time.... I do tend to think through things in details... and occasionally overthink it's true but having a good roof above your head is important :-)

[@Fazzamania]

Did I miss the fitting of furrings?

[@Mr_A_Builders]

They're there mate, along with diminishing battens. Our previous video to this goes into a lot more detail.

[@Fazzamania]

@@Mr_A_Builders ok thanks.

[@paulf2529]

The best roof possible would be one with an epdm covering. The title i submit is misleading.

[@Mr_A_Builders]

Go on...I'll bite...how would EPDM be more efficient?

[@MrThebigredone]

🤣

[@paulf2529]

@@Mr_A_Builders I'm not referring to the thermal properties but the many advantages it has as a top covering over and above that provided by fiberglass. I don't have any real issues with the construction from a thermal efficiency perspective.

[@Mr_A_Builders]

@paulf2529 oh right. Fair enough. You prefer the patchy, many weak points kinda finish. Fair play.

[@paulf2529]

​@@Mr_A_Builders like anything it depends on how well it is carried out. Personally I have seen first hand many bad fiberglass installations and i doubt these will get anywhere near the quoted life expectancy.

[@jeffriley6997]

How are you fixing into a joist with 100mm screws but you've got 150mm of insulation 😂

[@Mr_A_Builders]

Oh dear Jeff, you've had a nightmare there pal!