Beam and Block for Ground and Upper Floors

Beam and Block for Ground Floors

A minimum void of 150mm 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. 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 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.

When a beam and block floor is used in a domestic garage or similar application where high concentrated loads are evident, a 75mm concrete topping, reinforced with A142 mesh must be applied directly to the top of the beams and blocks.

Beam and Block for Upper Floors

Infill blocks to be standard solid light aggregate/concrete 440 x 215 x 100mm. 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 has to comply with Building Regulations Approved Document E.

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.

ground upper floors

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