Buildup

BuildupU-values, ISO 6946

Element

Build-up, inside to outside

Conditions

Inside °C

Outside °C

Humidity inside %

These set the temperature profile and the surface check. They do not change the U-value, which is a property of the build-up.

Scope

A calculation to check, not a certificate. The conductivities listed are the range the published tables give and are a starting point only — a submission is built on the certificate for the actual product. Repeating thermal bridges at junctions, fixings and reveals are not included, and neither is a full interstitial condensation assessment. Nothing typed here leaves the page.

Section

Insulation Masonry Timber or bridging Cavity Temperature

Result

—W/m²K

Does it hold up

Layer by layer

—U W/m²K

—R m²K/W

—mm thick

—°C inside face

Bridging is handled by the combined method. Where the two limits part company by more than half, the method is past its range and the page says so.