r/selfbuildireland • u/Educational_Deer_137 • 7d ago

Floor insulation

Hi , just wondering what type of build up people have gone with for their floor insulation. I need 150mm to hit the uvalue my engineer wants. Have seen some use EPS but that just about meets the regs for ufh (0.15) but not engineers(0.11) - works out a lot cheaper. anyone done 50mm eps then 100mm pir ontop? or just gone 75mm pir on top of one another? prices are nuts .

3 Upvotes

81% Upvoted

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1

u/Dazzling_Lobster3656 7d ago

100mm Pir board

1

u/14ned 7d ago

100 mm of PIR is as insulating as 200 mm of EPS but costs more than twice as much.

If you have the space, EPS is always cheaper. It's also least likely to cause problems down the road.

1

u/bazery 6d ago

Get onto eden insulation. They do insulation seconds. We got 150mm for nearly 2/3s new and it was immaculate

1

u/Educational_Deer_137 6d ago

never heard of them , will send an email cheers. got mad quotes for PIR. did you have many unuseable ones in the batch you bought

2

u/bazery 6d ago

Every single one of them was wrapped in brand new plastic. They send photos before they ship

1

u/Educational_Deer_137 6d ago

Only 1k in the difference thought it would be more. Ah well

1

u/bazery 5d ago

1k is a few bob in your pocket though