DL521 – Traditional Bay Window Within a Masonry Cavity Wall

Price range: £9.00 through £14.00 + VAT

This detail shows a traditional bay window installed into a modern masonry cavity wall construction with section and plan views. The bay window features externally opening triple glazed timber framed windows set back a minimum of 50mm from the external face and overlapping the insulation zone, with insulation and sealant installed around packers and optional airtightness to window edges. 

The detail includes a proprietary lintel to structural engineer’s specification with cavity tray over, custom bay window lintel and supports, and a pitched roof build-up with natural slate on battens, high resistance underlay, 150mm rafters with 150mm mineral wool insulation above and between ceiling joists, and proprietary eaves vent. The base shows a beam and block floor construction with 150mm insulation, 65mm floor screed, and trench foundation. 

The plan view demonstrates the 120° and 60° bay window geometry with support posts to lintel, cavity closers, and optional additional insulation between masonry end and plasterboard for enhanced thermal performance. A blockwork return is noted as common but less thermally efficient than cavity closer details.

See drawing notes for full information.

Features of this detail: traditional bay window, masonry cavity wall, triple glazed window, timber frame window, bay window roof, natural slate, mineral wool insulation, custom lintel, cavity tray, support posts, cavity closer, thermal performance, airtightness, VCL, Masonry, facing brickwork, 150mm cavity, full-fill insulation, non-combustible insulation, lintel, traditional, bay window, casement windows, triple glazing, outward opening, window seat, beam and block floor, cavity wall, timber frame window, slate roof, trench foundation, suspended floor, DPC

£9.00 + VAT
£14.00 + VAT
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06 DL521-524 Corner Glazing LR

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