Beam & Block

A guide to Beam and Block Flooring

Longley Concrete is a leading supplier of easy-to-install Beam and Block floors. Our systems comprise of 175mm deep, prestressed concrete beams which are fitted with 100mm deep building blocks placed in between. Beam and Block Flooring has many advantages including the fact that it is easy to handle, quick to install and provides an immediate working platform for other tradespeople. It is also rot proof, draught proof and fire resistant is an all-weather form of construction and provides buildings with good thermal insulation.

What is beam and block flooring?

Beam and block flooring is a technique used to create a creating a suspended concrete flooring system at the ground or upper floor level. Used by the majority of housebuilders, it is quick to install and comprises T beam floor beams infilled with precast concrete blocks. Insulated panels can be used in place of the blocks, to create an energy efficient home.

With factories in West Yorkshire and London, Longley Concrete has been at the forefront of precast concrete manufacturing for over 70 years and can produce enough floor beams for 40,000 new homes a year.

Beam and block for ground and upper floors

Beam and Block flooring can be used for ground and upper floors, providing a quick and safe working platform for follow on trades in the build programme. For technical installation guidelines see here. Beam and block flooring can be used to replace timber upper floors, providing a robust and squeak-resistant solution for intermediate flooring.


Longley beams are made with C60 (60N/mm2 at 28 days) concrete. It is prestressed with 5mm indented steel wire. All of our beams are manufactured in an enclosed factory environment using fixed moulds. This means that they have an enhanced finish as well as a superior dimensional tolerance.

Floor Blocks

All infill 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. The exact compressive strength needed in floor blocks differs depending on their application. For example for garage floors, blocks with 7.0N/mm2 are required, whereas the compressive strength of blocks built into loadbearing walls should not less than that of the blocks used in the wall construction.

Many housebuilders now use insulated EPS blocks (with or without a top sheet layer) to provide added thermal insulation. Longley Concrete provide a number of insulated flooring options, which can be reviewed here.

If you are unsure about compressive strengths one of our expert engineers will be able to advise you on these to ensure the correct blocks are used.

what is beam and block

To review the benefits of beam and block flooring, read this article.

For more information about our services please feel free to get in touch today by calling 01924 464 283.