UNDER-FLOOR FIRE BARRIER AND ACOUSTIC BARRIER
Acoustic products accepted by Robust Details
DESCRIPTION
The Envirograf® under-floor fire barrier (UF60) is made of reinforced foil-clad intumescent
material, internally reinforced with wire mesh. It is supplied 5mm thick x 1800mm long and in
standard widths of 400mm, 450mm, and 500mm, to suit joist openings 300mm, 350mm, and
400mm respectively. Other sizes can be made to special order. Acoustic sponge slabs (UFS)
40mm thick x 2½m long can be cut to size to fit over the fire barrier, enabling you to meet the
requirements of UK Building Regulations Document E (H in Scotland) for airborne and impact
sound acoustic protection and to provide a ‘U’ value to the ceiling/floor. UF60 can be used
under load-bearing or non-load-bearing floors.
USE
Use under floorboards laid directly over decorative lath-and-plaster ceilings. As the barrier is
wider than the gap between the joists, it allows 50mm either side to be bent upwards and fastened
to the joists with 30mm clout nails and the provided metal plates. The barrier must also
overlap adjacent pieces by 50mm. The barrier is lightweight and easy to fit – just lift three
floorboards at 1800mm intervals. The 40mm thick UFS acoustic sponge meets the requirements
of Document E of UK Building Regulations with Envirograf® Products 84, 96, and 105.
PERFORMANCE
The UF60 under-floor barrier was installed in a ceiling/floor without any plasterboard or
lath-and-plaster (just the barrier itself) and tested to BS476 Part 21 (1987), achieving 104
minutes integrity, insulation, and load-bearing.
For friendly advice, please ring us! 01932 268440
