This is a comprehensive and photographic method statement of floor screeding works. Screed can be final finish or a substrate of the final floor finishes like homogenous tiles, marble floor or granite floors. This step by step method can be useful for all newbies who would like to learn floor screeding.
The step by step method is listed below:
Create level pegs on the floor to be screed. This will serve as a guide when leveling the wet screed.
When the level pegs are dry, clean the floor by using water jet and sweep away the excess water.
Before screeding starts, ensure that the floor to receive the screed is very clean.
Prepare the cement mixer and bucket for screed powder mixing.
Place the screed premix powder to the cement mixer.
Add water to the mixer on to the amount recommended by the screed powder manufacturer.
While mixing the screed, prepare and mix bonding agent and OPC.
Use hand held electric mixer and mix until flowable consistency.
Pour and spread out the bonding layer over the floor area to be screed.
The bonding layer must be evenly spread to ensure that all screed will bond to the concrete surface.
Bring the screed mix unto the floor area until the desired quantity is achieved.
The screeding must start immediately before the bonding layer lost its tuckiness.
Use a long straight trowel and begin leveling the screed to desired thickness pressing onto the level pegs.
Work from sides to sides pressing the screed to compact it.
Move to the other side and repeat the step above.
Now move backwards and level the screed in a diagonal position. Always stamp and press the screed for better compaction.
If the screed thickness is not enough, top up using a trowel and level it. Repeat the steps above until the entire floor is covered with screed.
The screeding should end at the door area or at the free end where foot or traffic is allowed. Allow the screed to harden and cure for 7 days.
The finished screed for marble floor substrate should be rough and not trowelled to smooth surface. This is for good bonding between the tile adhesive and the substrate. Before tiling work starts, a good practice to avoid abortive costs is to check for debonding of screed or commonly known as hollowness. If there are any hollowness found, repair is a must to eliminate the problem after tiling works.
The repair of hollowness will be the topic on my next post.