DL517 – Dormer Cheek Party Wall Junction – Section 1

Price range: £9.00 through £14.00 + VAT

This section detail shows a dormer cheek less than 1m from a party wall or boundary line, based on Building Regulations Part B1 Diagram 5.2. Fire-stopping is carried up to the underside of BROOF(t4) rated roof covering. In residential settings up to 15m high, sarking felt may be taken over the wall and roof support members can pass through the wall if fire protected for 1500mm on either side. The detail includes warm pitched roof and flat roof build-ups with mineral wool insulation, VCL, breather membrane, and guidance on unprotected area allowances (4% of dormer cheek for buildings less than 10m high). Materials facing the boundary must be class B-s3, d2 or better if unprotected area exceeds 0.1m².

See drawing notes for full information.

Features of this detail: dormer cheek, party wall junction, loft conversion, fire junction, BROOF(t4), fire-stopping, unprotected area, warm roof, flat roof, mineral wool insulation, boundary detail, Building Regulations Part B1

£9.00 + VAT
£14.00 + VAT
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