GN52 Changes to Approved Document L1 Wales Dwellings
This four page guidance note provides 2022 Changes to Approved Document Part L1 Conservation of Fuel and Power in New and Existing Dwellings. It provides guidance on how a fabric first principle of design can be achieved, the minimum mandatory U-value requirements by key elements such as roof types, walls, rooflights, and windows plus how to assess and reduce thermal (cold) bridging. This guidance applies to Wales only.
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