Pocster

You certainly have ! cheapest inc vat was around £54 You are in the money ?

150mm pir ordered ; cheapest I could find certainly not local builders merchants . Also found vcl ( looks the same as Permagard ) slightly cheaper . Double tape ( for vcl overlaps ) , tape for edges , foil tape all found cheaper on eBay

Done to @Onoff ‘s made up spec ! ?

Pir upstands done . Foam where I had to ; foil tape on joints . Osb on timber frame just so vcl has something easier to stick to .

Ufh company said expansion perimeter not required ; pir upstands good enough for that . Nearly done one room of upstands - not neat - but every piece of pir is an off cut left over - so free ? Mind you the 15 sheets of 150mm pir will be expensive ?

If I put expansion tape at the perimeter like this https://underfloorparts.co.uk/product/underfloor-heating-perimeter-50m-foam-edging-strip-5rolls/ Does it go under vcl or ontop it ? ( i’m Guessing ontop ! )

I *presume* I silver tape the joints on the floor between each pir piece ????

I see ! Right ! Vcl over the lot and up past the upstands . All taped got it !

Why can’t I just cover the whole thing in vcl and tape it further up the timber . Why do the dpc strip around the perimeter? Is the vcl thin and likely to tear ??? That why ???

They would be perfect for that ? They have no grip on the surface but certainly don’t seem slippery when dry . They are structural glass so strength not an issue ( BUY THEM ! )

Nope ! Never gonna sell . I might build a modern art sculpture and incorporate them into it

Yes very dangerous device ; Best Buy something gentler like some glazing for example ... ?

I got a special price thanks to @Onoff.... You can’t have it unless you buy some ‘certain’ glazing I have ....

Toys !

So should I bend the dpc timber up onto the studs and nail it ? (only about a 30mm overhang) Then DPM 60cm wide around edges and up stud. Then that permagard membrane over the lot?

Surely I just need vcl Installer suggests https://www.permagard.co.uk/catalog/product/view/id/1532 Doesnt want black

You made it up good ! . I’m going with that ! Might have to pack between vertical timbers as membrane could sag between when screed goes on .

True - it would be lost with pb etc . yeah upstand pir 50mm So this type of thing ? Dpc overhang pushing the back pir out hence why I want to know if just taking a Stanley knife to it and trimming flush to timber frame ok .

I can ignore the lip and do this ? Can I trim the dpc under the timber frame as it gets in the way ?

Confused myself now . The original photo was upstand at finished screed - but that then means the edges won’t have any screed over them !!

So you are suggesting potentially this type of affair ?

Horizontal timber is base of timber frame

No Here’s a better photo

Hmmmmmm looking back at other photos i’m Not so sure now ! . Should the upstand be the same height as the floor pir ? I.e in my case 150mm - so it’s all flush ??

So in essence this ! ( with upstand at far end of course )