Foam insulation under concrete slab

Fionn · 03-19-17, 04:09 AM

Hi Toby, no problem.
150mm of PUR is just about minimum here to meet code.
You'll find that you'll probably end up in the same place in terms of minimum R value as us eventually, just takes years for things to change.
Also another point. If you ever intend to run the underfloor heating from a heat pump you want the tightest possible pipe spacing throughout - generally 100mm.
This improves the thermal transfer to the slab allowing you to run lower flow temperatures, which in turn increases the COP of your HP.

03-19-17, 04:09 AM	#21
Fionn Lurking Renovator Join Date: Aug 2015 Location: Ireland Posts: 25 Thanks: 3 Thanked 6 Times in 2 Posts	Hi Toby, no problem. 150mm of PUR is just about minimum here to meet code. You'll find that you'll probably end up in the same place in terms of minimum R value as us eventually, just takes years for things to change. Also another point. If you ever intend to run the underfloor heating from a heat pump you want the tightest possible pipe spacing throughout - generally 100mm. This improves the thermal transfer to the slab allowing you to run lower flow temperatures, which in turn increases the COP of your HP.