100mm vs 150mm insulation UFH under slab.
We have to make a decision tomorrow on our insulation to go under the slab, it’s 100mm on the drawings but is there any advantage to go to 150mm?
Scotframe 6” closed kit, 180m2 ground floor, 100mm subfloor, £1350 in difference between them.
Any thoughts/advice appreciated ?
As @Nickfromwales suggested, if you put a 25mm EPS sheet down first and then your DPM on top you instantly reduce the likelyhood of getting holes in it. Then do what you like with PIR or EPS.
If you're installing UFH, the pipe clips struggle in EPS so having an EPS build up with a 25mm - 50mm PIR on top aswell really does help (alot)!
We've got 325mm (300mm EPS100 & 25mm PIR) and then a Cemex Cemfloor @ nominal 45mm which is great. With hindsight I would have gone with 50mm
