Preparation is key

It is important that the preparation of the floor prior to installing flowing floor screed is carried out to the highest standard. Please see below for details.

Water Tight

The building must be made be weather tight - the roof and external doors /window openings must be fitted with either final fixtures or clear polythene.

Exposed Edges

Install temporary formwork to exposed edges (eg door openings or level changes)

Clean

Remove all dust, debris and contamination from the floor surface.

Insulation

Ensure that all high/low points are removed from the sub-base and that insulation boards are laid flat.
Insulation boards should be tightly butt jointed with staggered joints.

Membrane

Install a polythene separating membrane to floor (500 guage or similar) join with 50mm tape. Ensuring that all air pockets are removed and are free from punctures and creases.
Lap joints should be 100mm and where necessary continue the polythene up the face of all wall/floor joints to the full depth of the screed.
Perimeter isolation strip should be fixed at wall/floor junctions and around any columns, pipework etc.

Underfloor Heating

When used on underfloor heating we recommend using polythene to separate the membrane.
All heating pipes and cables must be securely fixed down.
Warm water systems should be filled prior to the application of to reduce the risk of pipes floating when the screed is poured.

Minimum Application Thickness

Bonded, 25mm
Unbonded, 30mm
Floating commercial, 40mm
Floating domestic , 35mm
Underfloor heating (min cover to pipe),  30mm

Please make an allowance for tolerances and any isolated high spots as this will impact on the overall depth and material usage.