Where to buy 10mm insulation board?

[JP_]

I wish to insulate the window reveal as well as the wall in my next room, as concerned that damp/mould might still form around there, and want to make the room as thermally efficient as possible. So was thinking of using 10mm insulation board, as i saw some on a building site once, but cannot find anything now.

Other than this, any suggestions on how to best tackle it? I'll be putting 50mm kingspan on the walls, so this will effectively make the reveal area colder. I could maybe just use lots of expanding foam to stick the plasterboard, making an insulation layer ... might be the best option, maybe with some spacers to make sure I don#t flatten it...

 

[Notch7]

you can get 12mm PIR board ie celetex?

 

[^woody^]

Cut some a stip of insulation down with a saw

 

[JP_]

I found some tile backing insulation boards 6mm - maybe these will be good enough?

Cut with a saw? Hmmm, maybe ... but I will probably make a hell of a mess of it.

 

[JP_]

these are 10mm
https://www.pureadhesion.co.uk/marmox-1250x600x10mm-insulated-tile-backer-boards.html

Should do the trick eh?

 

[^woody^]

but I will probably make a hell of a mess of it.

Only if you can't cut butter.

Its actually easier than cutting timber, and it comes out flat.

 

[Notch7]

Should do the trick eh?

Not very insulating though.

You can cut down celetex insulation, maybe be worth it if you only need enough for 1 window and you have some offcuts.

 

[JP_]

OK, will steady my hand and cut up some offcuts - I usually end up with a fair few!

 

[lostinthelight]

Could You could make a guide by nailing two parallel strips of wood to a plank or the like the thickness you need the insulation to be . drop the insulation between and cut using the strips to guide the saw?

 

[JP_]

Guess so. Will probably just cut it and hope, and be creative with the sticky foam if it gets a bit wobbly.

 

[oldbutnotdead]

Was going to suggest Marmox, R value is much better than plasterboard and you can skim it (tricky doing that with Kingspan etc)