Forum for DesignBuilder UK SBEM EPCs and Part-L and Scottish Section 6 Building Regulations compliance checking

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Cormac Regan
Posts: 30


Postby Cormac Regan » Fri Jan 10, 2014 5:56 pm


I prepared the attached BRUKL for a project.

The U-value was set at 0.25 throughout, but on the last page of the BRUKL it gives the minimum as 0.12.

I assume that this is SBEM making allowances for there being no edge losses at the point were min is.

Can anyone confirm if this is correct.


Draft BRUKL LED Lighting.pdf
(282.94 KiB) Downloaded 261 times
Andrew Bairstow
Site Admin
Posts: 504
Location: Birmingham, UK

Postby Andrew Bairstow » Sun Jan 12, 2014 4:41 pm

When a floor is not declared as corrected sbem calculates the U value on a zone by zone basis. The minimum U value will probably correspond to a zone where the perimeter:area ratio is a minimum (but greater than zero ie still has an external or unconditioned edge).
Andrew Bairstow
DesignBuilder Software

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