After The Screed Comes The Sanding
After the liquid screed is spread on the floor and after it is settled and dry, floor sanding is required to be done before installing any finishing floor above it. Floor sanding is done so as to remove any laitance having loose surface and various surfaces of the floor seal with each other effectively. No matter what flooring is to be applied later, but floor sanding is recommended for all.
The process of sanding is done by using specialized machines and is best done by professional service providers. Before commencement of this process, first of all the floor is cleaned to make it clear of any sort of nails or other sharp materials. These sharp materials can damage the sanding machine. Usually drum sanders and large belt sanders using coarse grit papers are used for the first cut and initial stages. Apart from the broad main floor, the narrow regions like corners, edges and stairs remain. The process of sanding is done for them using edger sander and coarse grit papers of similar grit used initially. It is in this stage that holes are filled or boards are cut. A second cut is then carried on using the sand papers having double grit than used previously. After this is done, a finishing sander or a finishing machine is used to give the final touch. Finally, the sanded floor is sprayed with sealants. Sealant can be chosen depending on the flooring to be used.
It is advisable to put the flooring only after the floor sanding service is carried out and completed. Sanding improves the durability of the floor and avoids further troubles in the process of flooring. Various type of floorings like tiles, flags, carpet, vinyl, micro cement, and hardwood can be used after completion of sanding.
Laitance Removal and Priming
Once the anhydrite liquid screed has been laid, the thin layer of laitance left as any surface water evaporates should be removed by sanding the floor approximately 7-10 days after application. This will not only help the drying out process, but will also provide a stable surface on which to tile onto. A calcium sulphate compatible primer should be applied to the floor once the floor has completely dried to the recommended moisture levels at which point a floor covering can be applied. It is also important that any adhesive used is anhydrite / calcium sulphate compatible. Please check with your chosen suppliers to ensure that this is the case.