150mm PIR insulation build up

[Moonshine]

I am about to order the PIR for my floors, after the tears that its 40% more than my original costing i am just figuring out the best build up.

 

Its a total thickness is 150mm which i can get 2.4 x 1.2m sheets of 150mm for £47 ex VAT (recticel Eurothane GP), but figure it will be easier to cut and stagger joints if i do 100mm and 50mm, which would be £48 ex VAT for 2.4 x 1.2m sheets or 100mm and 50mm.

 

Thoughts?

[James Newport]

The thinner ones are easier to move by yourself

[Declan52]

Put the 50mm down first as it's easier to cut round any pipework that's on the subfloor going to sinks etc. 

[Russell griffiths]

Do not buy the 150 it’s horrible to cut. 

[dnb]

Agreed that the 150mm is hard to cut. I ended up making an extremely large (and possibly lethal) table saw to get the cuts straight and vertical.

[crispy_wafer]

May I ask where you are getting the 150mm from at that price please?

[Moonshine]

23 minutes ago, crispy_wafer said:

May I ask where you are getting the 150mm from at that price please?

 

CCF, though after phoning them, it appears that the local branch can't get the recticel and they can only off the more expensive celotex

 

[Oz07]

Magnet sometimes do good price on 100mm to get you through the door

[dpmiller]

And if your subfloor is less than perfect (and your U values allow it) go with 50mm of EPS at the bottom. It's a bit more forgiving.

[Russell griffiths]

If you have the height use 200mm eps and save 40-50%. 

[DragsterDriver]

1 hour ago, Russell griffiths said:

If you have the height use 200mm eps and save 40-50%. 

yep that’s how I’m looking. Frametherm 140mm has gone through the roof-

im now trying to work around that 

[Moonshine]

16 minutes ago, DragsterDriver said:

yep that’s how I’m looking. Frametherm 140mm has gone through the roof-

im now trying to work around that 

 

Could you use dritherm 32? i and getting 150mm thick for £10.22 M².

 

Though i guess there is the issue of cutting it, as it comes in 455mm wide batts what will be a pain to cut into 400 cts timber

[DragsterDriver]

1 hour ago, Moonshine said:

 

Could you use dritherm 32? i and getting 150mm thick for £10.22 M².

 

Though i guess there is the issue of cutting it, as it comes in 455mm wide batts what will be a pain to cut into 400 cts timber

isover 140mm frame roll 32 is £13m2 inc vat today.

can cavity dritherm be used in a timber frame? I don’t know tbh.

 

[Moonshine]

1 minute ago, DragsterDriver said:

can cavity dritherm be used in a timber frame? I don’t know tbh.

 

i can't see why not, though my price is excluding VAT, so for the sake of 80p its not worth the cutting