A minimum void of 75mm must be provided between the soffit of the floor and
the solum.
A continuous damp proof course must be laid beneath the
beams.
Infill blocks to be standard solid light aggregate/concrete
440 x 215 x 100mm to BS6073 : Part 1 : 1981. Minimum compressive
strength of 3.5 N/mm-2 or 7.0 N/mm-2 with a traverse load
capacity of 3.5 kN on a 420mm span.
To seal the joints, the whole floor should be grouted with
a nominal 3 : 1 sharp sand/cement mix as soon as possible
after fixing of the floor joists and blocks. Brush the
grout over the floor with a stiff broom after the surface
has been well 'wetted'. Ensure the grout penetrates into
the joints to provide a rigid construction.
Floor finishes applied directly to the grouted floor can
be: chipboard on polystyrene, screed or asphalt.
Upper Floors
Infill blocks to be standard solid light aggregate/concrete
440 x 215 x 100mm to BS6073 : Part 1 : 1981. Minimum compressive
strength of 3.5 N/mm-2 or 7.0 N/mm-2 with a traverse load
capacity of 3.5 kN on a 420mm span.
When the floor separates
a dwelling from another dwelling, it is necessary for the
infill blocks to have a minimum density of 2000 kg/m3 in
order to provide the necessary floor mass. See Sound Regulations
for more details.
A plasterboard ceiling can be easily installed
using metal clips, 50 x 50mm timber battens and plasterboard;
this inevitably increases the fire resistance. See ancillaries
for clip details.
The floor when constructed with a plasterboard
ceiling provides up to 1 hour fire resistance.
The widened beam
constructed as above provides up to 1 1/2 hour fire resistance.
