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Prestressed concrete beam / rectangular / for floors
GROUND AND UPPER C.R. Longley & Co Ltd

Characteristics

  • Material:

    prestressed concrete

  • Cross section:

    rectangular

  • Applications:

    for floors

Description

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.

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.

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