How To Lay A Sand And Cement Floor Screed

Unbonded sand and cement screed minimum thickness.

How to lay a sand and cement floor screed.

Next pour about 1 inch of screed onto the floor and lay down long wooden battens to divide the room into 10 foot wide strips. Then combine the screed mix with water so it s the consistency of paint. 3 coarse aggregate 10 mm maximum aggregate size should be considered if the floor screed thickness is greater than 40mm. Laying on wet sand with cement.

Therefore a suitable type of cement shall be selected and sand needs to be free of deleterious materials. Laying a level floor screed over a large area is difficult and to do so by eye requires years of experience. However there is an easier way and this is where the word screed. The slabs are laid on a base of sand mixed with cement.

It also allows to lay the slabs straight on the floor screed avoiding the high costs of the levelling screed arrangements. The minimum sand and cement screed thickness would be 40mm as defined by the british standard. The screed may be left as finished or floated to produce a smooth surface on which to lay the specified flooring or finish. A traditional sand and cement screed is normally a 1 4 or a 1 3.

This technique guarantees the slabs long term stability and their vehicle accessibility. 1 tonne of flooring grit or sharp sand mixed at 4 sand to 1 cement will cover approximately 15 square metres of floor when laid at 40mm thick. So this is how i make my floor screed a 4 to 1 mix with little water mixing the floor screed slow and not over mixing the sand and cement will keep it at a. 3 sands or 1 portland cement.

If the thickness of the floor screed does not exceed 40mm then the recommended mix is 1 portland cement. Ready mixed sand and cement screeds that are factory mixed and then delivered to site offer additional quality assurance over site mixed screeds and offer a more consistent material. 40mm traditional sand and cement screed. Added to that cement type grade of aggregate and the method of storage of screed material influence the mix ratio to a certain extent.