Question 1

1. What goes on top of a block and beam floor?

Accepted Answer

Typically, insulation boards are laid over the beam and block floor deck, often with a damp-proof membrane or vapour control layer included, depending on the design. A sand and cement screed or concrete topping is then applied, with final floor finishes installed above.

Question 2

2. How far can beam and block span?

Accepted Answer

Concrete floor beams are manufactured in a range of lengths to suit different spans. Generally, the maximum length they’re made to is up to around 6 metres.

Question 3

3. How many blocks are needed for block and beam floor?

Accepted Answer

This depends on the total floor area, as well as the spacing of the beams you’re using. Beams are laid at fixed centres to suit standard block sizes, with the infill blocks fitted between each beam. Quantities can be calculated from the floor layout and beam spacing.

Question 4

4. Can you cut concrete floor beams?

Accepted Answer

No, prestressed concrete floor beams should not be cut on site. Lengths must be specified correctly and ordered to suit the design.

Question 5

5. Do block and beam floors need ventilation?

Accepted Answer

Ventilation may be needed where there’s a void is below the floor, to remove moisture and prevent the build-up of ground gases such as methane. These requirements depend on design and relevant building regulations.

Block and beam flooring

Concrete Floor Beam 150mm x 4.8m

Concrete Floor Beam 150mm x 4.2m

Concrete Floor Beam 150mm x 3m

Concrete Floor Beam 150mm x 3.6m