Hi,
Im new to the site: Stumbled across it when trying to resolve my querry.
Does anyone know how to account for low emissivity cavities in U-Value calculators? I'm using the BRE calculator, trying to calculate yhe U-Value of the following timber frame closed panel build-up:
12.5mm Plasterboard
35x50mm vertical battens to create a service cavity
Reflective AVCL layer
25mm PIR Insulation
38x89mm timberframe studs at 600mm centres, with 100mm lambda 0.044 insulation between the studs
9mm OSB
Reflective breather membrane
50mm Cavity
102.5mm brick
I come up with the calculation below, but it seems to me that the reflective membranes on the inner and outer cavities have a far to large impact on the calculation?
Walter V
