Beam and Block Floor - Installation Guidelines

ReadyTherm Installation Guide


CEMEX specialise in production of both traditional beam and block as well as insulated floor systems. In addition CEMEX supply a wide range of accessories including vents and clips.

To find out more about installing beam and block flooring check out our useful video.


The use of ReadyFloor® considerably reduces site preparation and thus only the removal of top soil and any vegetable matter is required. No oversite concrete or additional surface seal is necessary.

Provision of a void between the underside of the floor and the ground level of at least 75mm (150mm for clay) and 150mm in Scotland. If the site is liable to flooding then subvoid drainage may be required.

ReadyFloor® seldom requires an increase in foundation size, however if the ground condition is very poor, specialist advice should be sought. ReadyFloor® beams should only be lifted when supported near the ends of the units, taking particular care with beams over 3m in length.

Beams must only be lifted in an upright position. The approximate self weights of beams are: 155mm - 36kg/m; 225mm - 66kg/m. In order to prevent damage to beams, they should be stacked on battens on a hard level surface. Battens must be placed near the ends of the beams and in line with each other throughout the height of the stack. The bearings for the beams should be clean, level and free from debris.

Mortar Application

The mortar in the masonry must be cured and have sufficient strength to support the floor. A continuous damp-proof course should be laid along the support wall below the floor in accordance with CP 102 : 1973. For masonry construction the beams should have a nominal bearing of 100mm. Where supported by steel the nominal bearing can be reduced to 75mm.

In cavity construction, beams should not project into the cavity, where two or more beams are placed side by side, the space between the beams above the flanges must be filled with in-situ concrete of minimum compressive strength 30N/mm2 with 10mm maximum sized aggregate.

Curing Concrete

The concrete must be allowed to cure to the necessary strength before loads, such as partition walls, are applied. The beam shall not be worked on site in any way ie, by drilling, notching, cutting or in any other manner, without the permission of CEMEX Floors.

Place floor beams at the centres shown on the drawing, positioning infill blocks between the extreme ends of the beams as work progresses in order to ensure the correct spacing. A 1:4 cement sand slurry mix grout should be well brushed into the floor.

Prior to grouting, the floor should be thoroughly cleaned and wetted to ensure effective seal. Note, that prior to grouting, the floor does not form a safe working platform and where barrow or bogie runs are required plywood or scaffold boards must span between beams at all times.

Throughout construction any loads imposed on the floor, such as those from stored materials etc, should be minimised and in any event must be short term and not exceed the load for which the floor was designed.

When ReadyFloor® beams are used at upper floor all necessary care and attention should be given to provide a safe working platform as noted in the Precast Flooring Federation Code of Practice for the safe erection of precast flooring and associated components.

ReadyFloor® is capable of achieving a half hour fire rating with 155mm beams and one hour with 225mm beams.