Keeping the rain out: good site practice for timber frame buildings
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Research has demonstrated that leaving a party wall cavity clear allows it to act like a chimney, pulling warm air upwards towards a cold roof space, with colder air moving in behind it. This cycle of air movement affects the thermal performance of buildings that have party wall cavities, even though insulation is already present between studs (for acoustic performance). Changes to building regulations in recent years have aimed to reduce heat loss and energy use, resulting in many more timber frame party wall cavities being insulated.
Article from Timber 2016 Industry Yearbook
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