How it works

Anhydrite – Flowing Screeds

Flowing screeds are manufactured from a recycled calcium sulphate binder (a by-product of the production of Hydrofluoric acid), selected aggregates and additives to produce a free-flowing, self-compacting screed manufactured to BSEN 13813:2002.

Flowing screeds are designed to provide a level surface in both commercial and domestic buildings prior to the application of floor finishes. It can be used as a bonded, unbonded, or floating construction and is particularly suited to use with underfloor heating. Flowing screed is available in various mix designs and used as part of many building systems to offer specific solutions.

Unlike sand cement screeds, flowing screed is 100% protein free, making it ideal for application in medical or other areas of hygienic importance as it cannot harbour bacteria.

Flowing screed forms a self-curing membrane removing the need for polythene sheeting, eliminating curling and reducing shrinkage. Flowing screed is liquid in application and self-compacting this results in a SR2 surface finish (BS8204) which can greatly eliminate the need for smoothing compounds prior to the application of some floor finishes.

The self-compacting nature of flowing floor screeds coupled with the gypsum crystallisation process provides excellent compressive and flexural strength even at reduced screed thickness.

Flowing screed has a smaller shrinkage profile than is associated with sand cement screeds, allowing for a reduction in expansion joints, this creates fewer weak points in the screed finish. Reducing the number of expansion joints having to be reflected in the floor finish will provide a more aesthetically pleasing appearance.

Following installation, flowing screed dries at a rate of 1mm per day up to 40mm and 0.5mm per day thereafter, as flowing screed can be installed thinner than sand cement this can allow for reduced drying times. The drying rate per day can be increased by good site management and use of force drying, refer to ‘Floor covering preparation and Drying’

Joints and Bay Sizes

Flowing screed has a smaller shrinkage profile than is associated with sand cement screeds, allowing for a reduction in expansion joints, this creates fewer weak points in the screed finish. Reducing the number of expansion joints having to be reflected in the floor finish will provide a more aesthetically pleasing appearance.

Drying Times

Following installation, flowing screed dries at a rate of 1mm per day up to 40mm and 0.5mm per day thereafter, as flowing screed can be installed thinner than sand cement this can allow for reduced drying times. The drying rate per day can be increased by good site management and use of force drying, refer to ‘Floor covering preparation and Drying’

Cementitious

Cementitious flowing Screed is a formulated cement based liquid screed that is a self-compacting and free flowing floor screed; that is chosen for its quick drying nature.

Cementitious flowing screeds are compatible with all types of floor coverings, cementitious adhesives, damp proof membranes and floor levellers; and can be used for domestic and underfloor heating, and for commercial use. All floor finishes can be applied without the need for sanding since surface laitance does not appear on cementitious flowing concretes.

Due to Cementitious flowing screeds being cement based, floor coverings can be applied quicker than other screed types.
Cementitious flowing screeds can be tiled at a final moisture content of 3.5%CM and timber floors can be installed at a final moisture content of 2.5%CM; speeding up the entire build process.

Compared with other liquid screeds which generally need to be force dried with underfloor heating; cementitious flowing screeds can be used in non-heated floors as it doesn’t require force drying to remove moisture; and with minimal drying shrinkage (<0.05%). Using the correct tile adhesives; tiles can be placed in as little as 5 days in nonheated floors and after 16 days in heated floors once the heating has been commissioned. If you were to force dry cementitious flowing screeds, then this can be done after 7 days.

To find out more contact us. We are more than happy to discuss your requirements and to provide a quote for this service.