R
Ruth
Plan: laying stone tiles on wooden floor and small concrete area at lower level. I understand that the ply provides horizontal rigidity, reducing horizontal movement, the more layers of ply the more this theory holds (18mm ply). Could I use two sheet of 9mm ply instead of 18mm, from a practical perspective it would be much easier to handle? If the joints were staggered and the two sheets glued propery, both screwed to the boards below (is 200mm spacing correct?), could this be even better than a single 18mm sheet since there would be no gaps between sheets and the whole area would be a single solid layer. This is used in boat building to achieve a rigid structure. Or is there is a good reason for using a single sheet with a small expansion gap (is 3mm approx suggested?). This leads on to the question of decoupling membrane, I can see their merit when you predict some movement of the subfloor, would you always use over ply? With my double sheet idea would I eliminate movement and therefore no need for the mat?
My second query relates to tiling on tiles, I know this is scorned on but the ceramic tiles currently down in the small concrete area have been there forever and seem incredibly well stuck down. The levels would be easier too. They have a textured surface, other than giving them a good wash with sugar soap, is there any need to scratch the surface to provide a key? Would they need a different adhesive to that used on ply?
I much appreciate your opinions and words of wisdom
My second query relates to tiling on tiles, I know this is scorned on but the ceramic tiles currently down in the small concrete area have been there forever and seem incredibly well stuck down. The levels would be easier too. They have a textured surface, other than giving them a good wash with sugar soap, is there any need to scratch the surface to provide a key? Would they need a different adhesive to that used on ply?
I much appreciate your opinions and words of wisdom
