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What does AVCL stand for?
BS 5250 covers what?
As per BS 5250, what is the recommended low-level ventilation requirement on a dwelling with a pitched cold roof using an LR type underlay which is vapour permeable and airtight, where there is a well-sealed ceiling?
When does the UK government expect to achieve net zero greenhouse gas emissions?
Underlay should offer weather defence against wind-driven rain or snow and wind uplift resistance in accordance with which British standard?