Beam & Block Floors
Introduction
Longley's Beam and Block Flooring system comprises of 175mm deep prestressed concrete beams installed with 100mm deep building blocks laid between them.

Prestressed Beams
Our beams are manufactured with C60 (60N/mm2 at 28 days) concrete, prestressed by means of 5mm indented steel wire to BS5896, having a minimum breaking load of 34.7kN. Structural design is in accordance with BS8110. The concrete cover to the reinforcement is such that a moderate exposure condition as described in BS8110 is satisfied. Longley beams are manufactured in fixed moulds within an enclosed factory environment, giving them a superior finish and dimensional tolerance.

Floor Blocks
The infill blocks should be 100mm thick and manufactured in accordance with BS6073. The blocks should have a compressive strength of 3.5N/mm2 or 7.0N/mm2 and be able to support a minimum transverse load of 3.5kN on a 420mm span. Where blocks are built into loadbearing walls the compressive strength must not be less than that of the blocks used in the wall construction. For garage floor applications, blocks with 7.0N/mm2 compressive strength should be used in conjunction with 75mm thick concrete screed reinforced with A142 mesh.

Benefits of Beam and Block floors

Easy to handle, quick to install 
Beams and blocks can be easily handled by forklifts or cranes. Smaller lengths can be manually handled, risk assessment permitting.

Simple all weather form of construction
There is no need to worry about frost damage to floors.

Provides immediate working platform
No need to wait for concrete slabs to cure. Grouted floors form an immediate platform to work from.

Draught proof, rot proof and fire resisting
The durability of solid concrete, but as simple to install as timber.

Good thermal insulation
Insulation requirements by Building Regulations are easily achieved.