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Liquid Screed or Flo - Screed is pumped to a datum set by laser levels to ensure that the finish is level and achieves SR2. It is designed to provide a smooth level surface in both commercial and domestic buildings prior to the application of floor finishes and is particularly suitable to application as a floating screed and for use with under-floor heating systems due to the higher thermal efficiency.

Liquid floor screed is self compacting and void free, it does not require reinforcement, it can be applied at a lesser depth than sand and cement and can take foot traffic in 24 to 48 hours.

As the screed is pumped into building there is less risk of damage from wheelbarrows and it is easier to place the screed on floors above ground level. The liquid screed can be pumped early in the build process allowing a longer time for drying and enabling carpenters to fix against a finished floor screed level.

It is a way of improving on the build time and improving the level of quality from the screed together.

 

Comparison

Liquid Screed

Traditional Sand and Cement

Productivity

Up to 2000m2 per day
Average 500 - 1000m2 per day

Only 100 to 150m2 per day

How quickly can you walk on the floor?

Within 24 - 48 hours
No curing needed

Should not be walked on for 7 days
Requires covering and curing

Joints

30 - 40 linear metres
Following building construction joints

Can only be laid in small bays of between 5 - 7 linear metres.

Performance

Very low shrinkage
Minimal Cracking
Will not curl

Shrinks
Cracks
Curls

Surface Finish

Easily achieves SR2 under BS 8204

Dependent on contractor
Curls and cracks at joints

On Insulation

No reinforcement required
40mm minimum thickness in commercial buildings
35mm minimum in domestic buildings

D49 or fibre reinforcement
65mm mimimum thickness

Un-bonded Floor Construction

Polythene laid directly to substrate minimal preparation
No reinforcement
30mm minimum thickness

D49 or fibre reinforcement
50mm mimimum thickness

Average Drying Times

1mm per day up to 40mm
Dependent on site conditions

11 Weeks at 75mm thickness
Dependent on site conditions

Quality Control

Produced under BS EN 13454

Often mixed on site by hand with poor quality control
Labour intensive