FLOOR SCREEDING UNDERSTAND APPLICATIONS AND METHODS OF LAYING

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FLOOR SCREEDING

FLOOR SCREEDING

UNDERSTAND APPLICATIONS AND METHODS OF LAYING SAND CEMENT FLOOR SCREEDS

UNDERSTAND APPLICATIONS AND METHODS OF LAYING SAND CEMENT FLOOR SCREEDS

FLOOR SCREEDING Aims: To introduce floor screeding Objectives: To understand how to set out

FLOOR SCREEDING Aims: To introduce floor screeding Objectives: To understand how to set out and lay floors to receive carpets, ceramic tiles and vinyl 3 /

FLOOR SCREEDING Introduction What do you know? n What is a bonded floor? n

FLOOR SCREEDING Introduction What do you know? n What is a bonded floor? n What is a semi-dry mix? n How are screeds set out for a level floor? n How are screeds set out for a floor with falls? n What is curing? 4 /

FLOOR SCREEDING Floor screeds Plasterers have always laid floor screeds but large areas now

FLOOR SCREEDING Floor screeds Plasterers have always laid floor screeds but large areas now tend to be carried out by companies that specialise in floor screeding. Floor screeds are laid either level or to falls and can incorporate underfloor heating 5 /

FLOOR SCREEDING Mixing proportions Mixes are usually 3 : 1 = 3 of coarse

FLOOR SCREEDING Mixing proportions Mixes are usually 3 : 1 = 3 of coarse sharp sand to 1 of cement 4 : 1 = 4 of coarse sharp sand to 1 of cement Mixing Mixed to a semi-dry consistency (test: it should form a ball in your hand - too dry it will crumble, too much water and you hands will be wet) Ready-mixed screed Delivered to site, can have retarders added if doing large areas; quite often pumped into the building 6 /

FLOOR SCREEDING Types of floor screeds Bonded floor screed The base is prepared and

FLOOR SCREEDING Types of floor screeds Bonded floor screed The base is prepared and the screed laid on a pre-laid base Unbonded floor screed The floor screed is laid on a damp proof membrane (DPM) Monolithic The screed is laid no more than three hours after the concrete is laid Floating floor screed This is laid on rigid or semi-rigid insulation boards 7 /

FLOOR SCREEDING Floor screed setting out to level using dots or screed rule 8

FLOOR SCREEDING Floor screed setting out to level using dots or screed rule 8 /

FLOOR SCREEDING Falls used for shower or wet room Setting out falls by using

FLOOR SCREEDING Falls used for shower or wet room Setting out falls by using square of datum line or packings of dots 9 /

FLOOR SCREEDING Laying floor screed using battens 10 /

FLOOR SCREEDING Laying floor screed using battens 10 /

FLOOR SCREEDING Floor laid using dot and screed method 11 /

FLOOR SCREEDING Floor laid using dot and screed method 11 /

FLOOR SCREEDING Curing and drying out This means stopping the moisture in the screed

FLOOR SCREEDING Curing and drying out This means stopping the moisture in the screed to allow the cement to reach full strength. You can spray the floor lightly for around 7 days, cover the floor with plastic sheeting to retain the moisture in the screed, or you can spray a chemical on the floor which breaks down when curing is complete. 12 /

FLOOR SCREEDING Conclusion You should now have the knowledge to complete the following: n

FLOOR SCREEDING Conclusion You should now have the knowledge to complete the following: n What is a bonded floor? n What is a semi-dry mix? n How are screeds set out for a level floor? n How are screeds set out for a floor with falls? n What is curing? 13 /

THANK YOU

THANK YOU