Tiling Over Concrete Floors
Both concrete or screeded sub-floors must be allowed to dry out thoroughly before tiling starts. If this is not allowed for, concrete shrinkage may effect the bond between tiles and bedding.
Allow one month for every 25mm of depth before tiling on new concrete. There should be an effective damp-proof membrane.
If the floor appears damp or there are signs of rising damp, this should be treated at this stage.
The floor surface should be clean, level, dry and free from dust. Dusty surfaces can be sealed with an anti-dust agent. A proprietary, self-levelling compound can be used to achieve an even surface. Minor irregularities can be taken up by adjusting the depth of the bedding medium.
This is essential when using a thin-bedmethod of fixing, as the tiles follow the contours of the sub-floor surface.
When laying tiles in a bedding mixture of cement and sand, some irregularities can be taken up by adjusting the thickness of the mortar.
Establish first your datum lines. These are marked on the four walls and the lines joined up. The line should allow for the thickness of the tile and the bedding. It must be level and allow for surface irregularities to be taken up.
You may have to trim doors at the bottoms and rehang them to accommodate the added floor depth.
When tiling an area with fixed units, such as a kitchen, it may be possible to remove all units and tile the complete area or to tile up to the units, using inner curved edging tiles to give a neat, hygienic edge. The level under the units might also be raised by using.
10. November 2011 by admin
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