NCC 2016 Volume Two
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Classification
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ACT 7.1.3 Building Fabric - Application of Part 3.12.1

ACT 7.1.3 Building Fabric - Application of Part 3.12.1

Where Part 3.12.1 requires building elements such as walls to have thermal insulation that forms a continuous thermal barrier, but an addition or extension opens directly, or by a common door, onto the unaltered part of building, the thermal barrier need not extend into the unaltered part of the building, except where contrary intention appears in Part 3.12.1.