DL504 – Separating Floor Treatment 1 Service Penetration

Price range: £9.00 through £14.00 + VAT

This detail shows two options for managing service penetrations through upgraded separating floors in dwelling-houses and flats formed by material change of use. Option 1 demonstrates wrapping ducts or pipes with 25mm unfaced mineral wool, while Option 2 shows lining the enclosure with minimum 25mm unfaced mineral wool.

Both approaches maintain the Floor Treatment 1 specification with independent joists in a minimum 125mm void, 100mm mineral wool insulation, and double layer 15mm plasterboard ceiling for 60 minute fire integrity. The detail is based on Building Regulations Part E Diagram 4.9 and includes provision for possible fire sleeves at floor junctions.

See drawing notes for full information.

Features of this detail: separating floor, service penetration, floor treatment, fire rating, 60 minute fire integrity, sound insulation, duct penetration, pipe penetration, mineral wool, fire sleeve, independent joists, Building Regulations Part B, Building Regulations Part E, material change of use

£14.00 + VAT
£9.00 + VAT
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02 Feb26 DL494-504 Fire and Acoustic for Material Change of Use

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