Hi,

 

anyone have any links to good u value calculators? Tried some from PIR manufacturers - unfortunately not all options are listed. I'm renovating a house and the spec seems stricter in Scotland than elsewhere regarding u-values for new builds, refurbishments, extensions etc. Building Control have specified my walls to be within this spec which is 0.22. The house is built with double block, outer leaf rendered 15>20mm, dense block. There is a 75mm cavity with inner leaf dense block. The entire structure will have a certain value before I add the insulation etc. I will be going down the route of installing PIR directly onto the inner face of inner leaf, taping then battening and dry lining the walls (warm batten). I'm looking for a calculator which will allow me to enter all these details if there is one out there. I have been looking at 100mm PIR but if I can reduce this even a wee bit, I'd be delighted. No biggie if I can't. Thanks

Is the cavity ventilated? If so the new wall is effectively going to be..

 

Plasterboard.

Batten

PIR

Single Block Leaf

 

Try that in the online calculators?

Edited November 18, 20214 yr by Temp

Only a few minutes to set up a spreadsheet and work it out yourself.

 

 

https://www.ubakus.com/en/r-value-calculator

 

"HK33" will be EPS bonded bead in the material list. 

1 hour ago, Temp said:

Is the cavity ventilated? If so the new wall is effectively going to be..

 

Plasterboard.

Batten

PIR

Single Block Leaf

 

Try that in the online calculators?

yes, the cavity is ventilated.