DL496 – Existing Internal Timber Floor Upgrade 30/60 Minute Fire Ratings

Price range: £9.00 through £14.00 + VAT

This detail shows five upgrade options for existing internal timber floors to meet 30 or 60 minute fire integrity and insulation requirements.

Each variation demonstrates different plasterboard ceiling treatments applied beneath existing timber joists, including single and double layer options using wallboard, soundbloc, and fireline specifications.

The detail includes guidance on mineral wool insulation requirements, noting that insulation may not be required where new joists are installed on hangers rather than built into masonry.

Sound requirements are based on Building Regulations Part E for new timber floors, internal floor type C.

See drawing notes for full information.

Features of this detail: existing timber floor, fire rating upgrade, 30 minute fire integrity, 60 minute fire integrity, sound insulation, plasterboard ceiling, mineral wool insulation, soundbloc, fireline plasterboard, joist hangers, Building Regulations Part B, Building Regulations Part E, material change of use


Update July 2026: Minor amendment to first build up on list – increased wallboard thickness.

£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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