Insulating quilts from Th%*nes

[pargyle]

Easiest is 25mm thick polystyrene at £8.50 for a big sheet from Wickes. Cut to size to fit tightly into your roof all year round using a bit f No more nails to hold it in place. Not keen on calotex or kingspan. Any leakage or condensation and it is a sponge.

Actually ,,, PIR does not soak up water ... " Since PIR is produced at very high temperatures, it won’t melt when exposed to high temperatures, which makes it fire-resistant. On the other hand, PIR insulation boards are also moisture-resistant, since their structure does not allow them to absorb water, unlike some other insulation materials, which enables them to preserve their integrity and thermal insulation properties over time "

.....and if you seal the cut edges with aluminium tape then they are totally protected.

 

[jenkinsbrynmair]

I keep all my spare PIR boards stacked up outside in all weather - never gets waterlogged

 

[user 6228]

I keep all my spare PIR boards stacked up outside in all weather - never gets waterlogged

they will absorb water eventually through the cut ends and expand a bit but we are talking years

 

[Swarm]

Skinflint builders in this area, they don't waste any of it.