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You are mentioning a vapour barrier just use the right insulation with a multi foil

Is the air vapour control layer simply dpm or is there a particular brand normally used ?

The "if" part of a two layer construction (rather than single layer) is whether sufficient moisture could accumulate at the layer join for it to actually condense out and then propagate the potential mould/rot. The solid PIR has nowhere for there to be that condensable moisture (compare with mineral wool etc). It's a long slow game (decade of life) to ensure that the moisture doesn't have opportunities to ruin everything. So many things to consider!

So how'd you resolve the cold area around the outside if you make it a warm roof on a roof like that?

Hi Steve, I sincerely appreciate your videos. You specialize in a crucial area of the roofing industry by addressing moisture-related issues. There's a significant need for education in this aspect of our field.

This guy s a Legend!

Thanks for sharing 🙏

i hate glass fiber roofs just use epdm easy super strong essay to joint never had a problem with them. glass fiber way to many variables Keep up the good work Steve..

Can you do a video about insulating solid walls (i.e. no cavity) and the issues around interstitial condensation, air gap or not, breathable insulation or not etc. There are millions of homes in the UK that have solid walls and would be good to hear from you on the subject if you can speak to it?

I could be wrong but I think I can spot some black plastic sheeting just say sticking up out of the 1st insulation layer at the corner after the window & the top right corner which may have been used as the vapour control layer. I'm not saying that would be correct, just pointing out what I think I can see.

Is this a cash job ?

I would guess that you would say the existing felt is a bad AVCL when converting an uninsulated roof to a warm roof. My bungalow had a secong floor with dormers added and flat roof extension 18 years ago. Not a scrap of insulation anywhere. Expensive to heat in the winter and an oven in the summer. At least th electrician was good out i would be much more concerned.

As well over overlapping joints reducing leakage, other advantages of multiple layers: less bowing (especially after cutting) and easier to cut, especially around corners and protrusions.

Interesting video. What would you recommend instead of the plywood against the internal wall?

I am thinking of putting solar on my 3 bedroom semi detached simple pitched roof, the roof is the original build and I was wondering would it be wise to change the roof first or not bother as its still functioning - I appreciate this is a bit of a difficult question without seeing the roof (about 50 years old) ut would appreciate your thoughts on the matter thanks 👍🏻

It certainly has to be a warm roof when it’s located in Scotland, do you ever work up that way or are you just looking for work in London? I can possibly put you in touch with a roofer that also specialises in water damage etc that you could liase with he lives up that way.

Those plastic polypropylene slates aren't good. They are amazing to use, all the same thickness, look great, lightweight. So quick and easy to use. They tick loads of boxes until you see them 2/ 3 years after you've put them on. They fade terribly like all plastic materials. The wrong client will pursue you if they are very particular

I installed 142 mm alufoil-faced insulation for my workshop build. The external sheeting was already completed, so I had real problems getting a precisely cut sheet into the stud gaps. Effectively, the sheet was compressing air. I found the most effective way to get a good seal was to cut the sheet exactly 10 mm too small, insert the sheet, then fill the gap with foam, starting from the back of the space. Of course, a workshop doesn’t have the insulation and damp requirements of a house, but I wonder wonder if my solution would be acceptable for habitable spaces. Final point, I bought the Festool specialist insulation saw. Used with their track it enabled extremely accurate and square cuts in the insulation. Disgracefully expensive though!

Hi Steve , could i ask what type of vapor barrier to use for warm flat roof and where to buy ? thanks

Is this the same as a warm pitched tiled roof? Does the foam insulation carry a lateral component of the weight of the tiles?

Buy cheap labour ...albania ? , get this outcome.

Counter batten underneath 🤷‍♂️

thanks for video , how to do if joists are fixed on wall hangers inside the building? is a cold roof , bcz of building hight ..thanks

Hi - I’m just designing my warm roof solution for an existing flat roof, thanks for your videos they are really informative. I intend to use Alutrix 600 but wanted to ask about it securing to a concrete slab roof - would you use any primer or additional adhesive Also what mechanical fittings would you recommend for securing the new insulation and osb to the concrete slab Thanks in advance

hi , thanks for video ! planning my new roof , same cold roof , joists hanging on the wall with hangers , got the walls from sides .. need ventilation! how is better to do .. go battens along the joists then across the joists ? need 2 layers of battens or one ?! thank you

Great vid 1 question comes to mind like a cold roof does a warm roof require 50mm of ventilation?

Whats the name of these tiles you recommend

How does the cross battening work with furrings on a flat roof with a sky light?

Have polymer plastic slates on our new build house for 18 years.they look great,as good as new,and have withstood 120 km per hour winds.

Only problem is when they fade

My roofing company in Utah, USA couldn't find anything decent on the market so we've begun using perforated metal z-bar and a custom bent-counter flashing which cleats into the z-bar. Very cost-effective, readily available materials without too much fabrication needed, and it's all metal, holds together very nicely, feels solid, and flashes into headwall same as any other counter flashing.

Hello Steve, I’m a carpenter new to the UK from NZ where our insulation regs are a lot different. I’m doing my first build here for a client, and the original plan was a pitched roof extension with cold roof insulation. The pitched ceiling has now changed to a flat ceiling but still a pitched roof. Am I better off insulating the flat ceiling, or the pitched roof?

Thanks for the video. We have a very similar bacony that recently was painted with fiber glass and keeps cracking. Do you still recommend Hydrostop EU AH-25 6 years on?

They are spaced the same regardless. Either between joists or straddling them. Or is it just me?

I've used them super slate the 1s I used art slate something like that nice clean work when working with them

Whats the liquid rubber called ?

Hi, how many screws per sheet of insulation would you use? I'm doing a flat roof soon with Resitrix, 130mm insulation and Alutrix. The architect doesn't want another layer of plywood on top on the insulation before the Resitrix. Thank you.

Is glasswool or rock wool better for a cold roof because it’s more breathable ?

Hey Steve Roofer. Can I ask you a question here? I've built a summerhouse in the garden and haven't thought about venting anything until I recently saw your videos. It's framed with 100x50mm pressure treated timber. Whilst I could vent the roof without too much hassle venting the wall cavities is going to be a challenge. The outside walls are UPVC cladding over a polythene sheet and the roof is epdm. So there's not much scope for water to move out if it gets trapped in the walls. It's a dilema and i just asked ChatGPT what he thought and he suggested using closed cell spray foam insulation which means i don't need to worry about venting anything as the foam is a vapour barrier and completely impermiable and there will be no gaps for air or moisture to move across. What say you?

All i’d add is the first one, he’s making a PIR sandwich with the 25mm on top. Should be the other way around as the dew point is pushed further out so any gaps in the expanding foam will be somewhere for interstitial condensation to form. Small risk and low volumes but easily eliminated if reversed.

I love Steve;s hair...It is strong and thick and looks good and won't come off in a gale, though it will lighten in the sun. . Mine is flimsy and thinning even though I am only 76. Envious !

I have a room that i think was a patio that the previous owner closed in. I dont think there is any ventilation and im not sure what to do 😅

Everyday is a school day - thanks for the video....

fab thanks for the direction

But what about cold roof?

plastic roofing

Hi Steve build a new house with a warm flat rood , 9x2 under furring 6 inch to 1 inch 18 mm osb aletrex 600 vapor barrier 150 insulation 18mm osb with termal broking fixings resetrix rubber . on under side of roof higest side 15 in lowest side 10 in i am putting a air tightnes membrane before plasterboatd , all of the walls are tucked in and seealed eg insulation from cavity meets roof insulation . question with no air ventalition under roof will it cause a problem

Timber need Air don't forget that when insulating your home.

What happens when you screw the drywall it's going to make a whole in the vapour barrier?

Great video, in construction years and membranes can be so confusing. What I've taken from this, is do the proper research if you want to a good job. For vapour barrier membrane AIR TIGHTNESS is key, that's why they give you the tapes with it.