Page 2 of 3
Re: shed insulation using polystyrene sheets
Posted: Sun Nov 19, 2023 11:14 am
by formula400
Something like this ??
https://www.screwfix.com/p/soudal-geniu ... lsrc=aw.ds
What kind of vapour barrier???
Does it go barrier/insulation sheets/OSD? Or insulation sheet/ barrier/OSD
Re: shed insulation using polystyrene sheets
Posted: Sun Nov 19, 2023 11:41 am
by demographic
Inside to outside.
OSB, vapour barrier, then insulation sheets between the studs.
I usually staple the vapour barrier to the studs(as few staples as you can get away with) then the OSB over it. Oh don't forget to tape the joints on the vapour barrier
One place I worked at had what was called Smartply which is OSB thats got a solid plastic surface that acts as a vapour barrier and you just tape the joints up but I've been told it was very expensive, not sure how much I believe that.
Thick enough OSB and you can put a screw in it anywhere for shelves/whatever.
Re: shed insulation using polystyrene sheets
Posted: Sun Nov 19, 2023 11:50 am
by demographic
Oh and I always use Gun grade foam, partly because I already have the gun but I use a lot of it pretty regularly so its in my interests to have the gun which can be shut off without wasting the rest of the tin.
I don't take a tin off the gun til I have another one ready to go on, hardly ever need the cleaner.
I never ever leave the gun without a tin of foam on it.
I clean the end of the nozzle by rubbing on timber as it cleans it without unnecessary abrasion that knackers the front valve.
Oh and I never lend them to fucking divvys.
Re: shed insulation using polystyrene sheets
Posted: Sun Nov 19, 2023 11:52 am
by Mr. Dazzle
demographic wrote: Sun Nov 19, 2023 11:50 am
Oh and I never lend them to fucking divvys.
Well that's me right out.
Re: shed insulation using polystyrene sheets
Posted: Sun Nov 19, 2023 12:02 pm
by demographic
Mr. Dazzle wrote: Sun Nov 19, 2023 11:52 am
demographic wrote: Sun Nov 19, 2023 11:50 am
Oh and I never lend them to fucking divvys.
Well that's me right out.
I've lent a few out and theres always some rivet who runs the foam out and leaves it empty, or removes the can and can't find another or just so dense that they remove the old can and bugger off to have their butties so whatever is left in the gun goes off and thats my 20 quid gun knackered.
Oh and the best gun I've had yet is made by Yato and has a PTFE coated valve and the bit the can screws into is PTFE coated as well.
Lasts way better than any other, as long as you follow those rules up there ^.
Re: shed insulation using polystyrene sheets
Posted: Sun Nov 19, 2023 12:17 pm
by formula400
Something like this???
https://www.screwfix.com/p/no-nonsense- ... -gun/28483
Never used anything like it before
Re: shed insulation using polystyrene sheets
Posted: Sun Nov 19, 2023 12:22 pm
by formula400
demographic wrote: Sun Nov 19, 2023 11:41 am
Inside to outside.
OSB, vapour barrier, then insulation sheets between the studs.
I usually staple the vapour barrier to the studs(as few staples as you can get away with) then the OSB over it. Oh don't forget to tape the joints on the vapour barrier
One place I worked at had what was called Smartply which is OSB thats got a solid plastic surface that acts as a vapour barrier and you just tape the joints up but I've been told it was very expensive, not sure how much I believe that.
Thick enough OSB and you can put a screw in it anywhere for shelves/whatever.
Would this be what I want
https://www.screwfix.com/p/capital-vall ... x-4m/59191
Re: shed insulation using polystyrene sheets
Posted: Sun Nov 19, 2023 12:43 pm
by Count Steer
I reckon that'd do. You may need a few. Hardly seems worth buying a gun if you are unlikely to use it again.
PS if you haven't got a staple gun and are likely to be cycling anywhere near the Surrey Hills in the near future you can borrow mine.

Re: shed insulation using polystyrene sheets
Posted: Sun Nov 19, 2023 1:34 pm
by formula400
Last question
Timber that Iβll be filling is 60mm, sheets of foil backed insulation is 50mm
Is that gap ok?
Re: shed insulation using polystyrene sheets
Posted: Sun Nov 19, 2023 1:36 pm
by formula400
Count Steer wrote: Sun Nov 19, 2023 12:43 pm
Cheers for the offer, but unsure when I am out that way
I reckon that'd do. You may need a few. Hardly seems worth buying a gun if you are unlikely to use it again.
PS if you haven't got a staple gun and are likely to be cycling anywhere near the Surrey Hills in the near future you can borrow mine.
Re: shed insulation using polystyrene sheets
Posted: Sun Nov 19, 2023 1:37 pm
by formula400
Count Steer wrote: Sun Nov 19, 2023 12:43 pm
I reckon that'd do. You may need a few. Hardly seems worth buying a gun if you are unlikely to use it again.
PS if you haven't got a staple gun and are likely to be cycling anywhere near the Surrey Hills in the near future you can borrow mine.
Cheers for the offer, but unsure when I am out that way
Re: shed insulation using polystyrene sheets
Posted: Sun Nov 19, 2023 2:11 pm
by Count Steer
formula400 wrote: Sun Nov 19, 2023 1:37 pm
Count Steer wrote: Sun Nov 19, 2023 12:43 pm
I reckon that'd do. You may need a few. Hardly seems worth buying a gun if you are unlikely to use it again.
PS if you haven't got a staple gun and are likely to be cycling anywhere near the Surrey Hills in the near future you can borrow mine.
Cheers for the offer, but unsure when I am out that way
If you're buying one I can recommend the Bosch cordless. It should be man enough for the job and it's not a hulking big thing so it's nice to use if you're doing a fair number of staples. They're about Β£57 though.
Re: shed insulation using polystyrene sheets
Posted: Sun Nov 19, 2023 3:03 pm
by demographic
formula400 wrote: Sun Nov 19, 2023 12:22 pm
demographic wrote: Sun Nov 19, 2023 11:41 am
Inside to outside.
OSB, vapour barrier, then insulation sheets between the studs.
I usually staple the vapour barrier to the studs(as few staples as you can get away with) then the OSB over it. Oh don't forget to tape the joints on the vapour barrier
One place I worked at had what was called Smartply which is OSB thats got a solid plastic surface that acts as a vapour barrier and you just tape the joints up but I've been told it was very expensive, not sure how much I believe that.
Thick enough OSB and you can put a screw in it anywhere for shelves/whatever.
Would this be what I want
https://www.screwfix.com/p/capital-vall ... x-4m/59191
The black stuff is usually thicker than you actually need for walls as its for floors before the concrete goes down and gets stood on a bit through the process.
Mind, the stuff we often end up with is so thin that it doesn't staple well so the black stuffs better than that.
Re: shed insulation using polystyrene sheets
Posted: Sun Nov 19, 2023 3:07 pm
by formula400
Just in B&Q 2.4 x 1.2m is bloody huge
Not sure what I was expecting



Basically going to get a little bit and order the rest on line
Re: shed insulation using polystyrene sheets
Posted: Sun Nov 19, 2023 4:37 pm
by mangocrazy
Don't get expanded polystyrene - it's shit. Celotex/Kingspan etc is the stuff to go for.
Re: shed insulation using polystyrene sheets
Posted: Sun Nov 19, 2023 4:42 pm
by Count Steer
mangocrazy wrote: Sun Nov 19, 2023 4:37 pm
Don't get expanded polystyrene - it's shit. Celotex/Kingspan etc is the stuff to go for.
Agreed. Jablite is polystyrene I believe.

Re: shed insulation using polystyrene sheets
Posted: Sun Nov 19, 2023 7:29 pm
by formula400
I got a few small sheets of this to see how I get on.
https://diybuildingsupplies.co.uk/produ ... KIQAvD_BwE
What have I learnt from this small endeavour already

Donβt use a saw, use a small sharpe knife nicked from the kitchen. Much much cleaner
Re: shed insulation using polystyrene sheets
Posted: Sun Nov 19, 2023 7:37 pm
by Count Steer
Wait until Chef finds out what you've been doing with his /her knives.

Re: shed insulation using polystyrene sheets
Posted: Sun Nov 19, 2023 7:41 pm
by formula400
Re: shed insulation using polystyrene sheets
Posted: Sun Nov 19, 2023 7:54 pm
by demographic
Through the vapour barrier onto the studs. So they hold the vapour barrier holds on til yer fixing the OSB on.
Oh and make sure theres something to fix the OSB to, especially on corners.