Block & Beam Flooring

Understanding Block and Beam Flooring

Block and beam flooring relies on high-strength, prestressed concrete beams positioned at specific intervals to span foundation walls. These inverted 'T' profiles are designed to support standard concrete infill blocks, creating a beam-and-block matrix that acts as a solid, immediate working platform. 

The system serves as an efficient alternative to poured timber or concrete slab floors. By suspending the floor structure above the ground, it eliminates issues associated with soil heave, shrinkage, or damp transmission. The beams are manufactured using prestressed steel wires encased in concrete, ensuring exceptional rigidity and the ability to handle significant spans while maintaining a manageable profile depth.

Material Range

• Prestressed Concrete T-Beams: Structural beams manufactured with a 150mm depth and 110mm top width. These units are cast with an inverted T-profile, providing a continuous ledge (shoulder) to support standard masonry flooring blocks. They are available in a variety of lengths up to 4800mm to suit common room spans and foundation grids.
  
  

Performance Benefits

• Rapid Installation: The dry assembly process requires no curing time, allowing follow-on trades to access the floor platform immediately after the beams and blocks are laid.
• Ground Stability: Suspended construction bridges over unstable or poor ground conditions, removing the risk of cracking associated with ground-bearing slabs.
• Rot and Damp Resistance: Concrete components are impervious to rot, rust, and vermin, and the void created beneath the floor aids in ventilation to prevent moisture buildup.
• Acoustic Mass: The density of the concrete beams combined with infill blocks provides excellent sound reduction between floors or from external sources.
  
  

Typical Applications

• Residential Ground Floors: Creating a stable, suspended floor platform in new build housing, particularly on sites with sloping topography.
• Extensions: Providing a quick structural floor solution where access for pouring large volumes of ready-mix concrete is restricted.
• Poor Soil Conditions: Spanning foundations in areas with clay soils or made ground where ground-bearing slabs are not engineered to perform.
  
  

Specification & Standards

• BS EN 15037-1: Precast concrete products - Beam and block floor systems - Part 1: Beams.
• BS EN 1992-1-1: Eurocode 2: Design of concrete structures.
  
  

Related Materials and Construction Uses

Concrete floor beams are the primary component of the system but must be installed alongside concrete blocks (typically 440mm x 215mm x 100mm) which serve as the infill. The installation usually requires a damp proof course (DPC) placed on the bearing walls beneath the beam ends. Once the beams and blocks are in place, a sand and cement grout is brushed into the joints to lock the system together. For thermal performance, rigid insulation and a floating screed or timber deck are commonly applied over the structural base.