Party Wall

Party walls have to deal with fire, sound and structure at the same time, and their junctions with roofs and external walls are where problems usually show up. This category includes party wall fire junctions with pitched roofs, flat roofs and parapets, new separating cavity walls meeting external walls, timber frame, CLT and Porotherm party wall details, and internal wall insulation junctions with party walls for retrofit projects.

Which Approved Documents apply to party walls? Approved Document B covers fire resistance and fire-stopping, including at the junction with the roof. Approved Document E covers sound insulation between dwellings. Work affecting an existing party wall may also need notice under the Party Wall etc. Act 1996.

Are there details for loft conversions near a party wall? Yes. The pitched roof fire junction details show fire-stopping where a separating wall meets the roof, which often comes up in loft conversions.