The surface of a liquid/flowing screed must be prepared to receive subsequent floor finishes to minimise the risk of failure and ensure that a trouble-free installation results for the duration of the service life of the floor. In this article, we’ll be running over the four key steps to get the perfect floor finish, for a long-lasting floor.
1) Removal of Surface Laitance
Occasionally it will be necessary to sand the surface of a liquid/flowing screed to remove surface laitance, however, it’s important to know that any laitance must be removed prior to application of an approval prime/sealer. It’s advantageous to remove the laitance at the early stages whilst It remains weak and friable, if left in place a small delay to drying times may result and effective removal may be more difficult to accomplish.
2) Determination of Residual
Prior to sealing/priming and the application of subsequent floor finishes the residual moisture content of a Liquid/flowing screed should be checked by the floor finishing contractor. Hair Hygrometer is the British Standard test method for determining the suitability of a base to receive resilient floor coverings. The test provides reliable results for calcium sulphate based screeds.
In all instances when applying resilient floor coverings the maximum permissible moisture content for impermeable finishes such as vinyl and tiles should be 0.5%, which when using the hair hygrometer test method equates to a reading of 75% RH, and 1.0% for permeable coverings such as carpet.
3) Repairs to Surface Damage Making Good
The surface of a Liquid/flowing screed may become damaged as a result of general site traffic or may, although unlikely require making up to the correct datum. In both cases remedial action will be required to make up the screed depth produce a surface that is suitable to receive resilient floor coverings.
When applying levelling compound to a Central Flow screed it is important that the residual moisture content has been determined and that the relative humidity should be less than 75% as determined by the hair hygrometer test method.
Failure to adhere to this stage of the process is likely to result in failure of the bond between the primer and or the floor covering and the screed.
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In common with all types of screed a suitable surface sealer/primer must be applied, in accordance with the manufacturer’s recommendations, to the surface of a Liquid/flowing screed prior to adhering the final floor finish.
Note: When applying cement-based products such as leveling compounds or adhesives, the screed must be dry and should be primed with the appropriate primer as recommended by the manufacturer of the cement based product.
Based in the West Midlands, Central Flow Screed is one of the UK’s leading installers of liquid floor and flowing screeds. As approved contractors with the major screed suppliers we provide nationwide coverage and have over 15 years’ specific industry experience.
Contact us today on: 01527 337023 // firstname.lastname@example.org