A U-Value Calculation measures the thermal transmittance (transfer of heat) of each material used within a structure/ building. The lower the total u-value is, the slower the heat is transmitted in and out of the building (better insulated).
Building Regulations/Standards continue to tighten the requirements of U-Values, with lower limits provided to ensure that building elements, materials and fabric are considered throughout the design and construction process.
Elmhurst Energy Consultancy provides U-Value Calculations to assist with Building Regulations/Standards Compliance- particularly important for extension projects (extension calculations).
A U-Value calculation is a computer-based assessment that measures the total thermal resistance of a structure. The unit of measurement for U-Values is given as W/m2K (Watts per square metre degree Kelvin); these are calculated through an approved U-Value Calculator which takes into account the material thickness and conductivity (K-Value).
With the amount of terminology thrown around by Building Regulations/ Standards it can be tricky to identify what calculation is required for compliance and when.
Where compliance is required for a whole-building energy performance (completely new buildings), U-Values are used within Standard Assessment Procedure (SAP) calculations for new dwellings, and also Simplified Building Energy Modelling (SBEM) calculations for new non-dwellings.
However for some extensions, U-Value calculations should be undertaken for compliance.
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