Tiling on top of existing tiles?

HI all, I've strayed in here from the decorator's forum in the hope of some good advice about floor tiling.

Our kitchen floor is currently tiled with 30 cm x 30 cm smooth, flat ceramic tiles with 5 mm grout lines on top of asphalt (laid originally as damp proof treatment). The correct adhesive was used for the purpose and they are very firm and level.

Is there any reason why we should not lay new tiles on top of the existing ones (rather than breaking them up, which I think would be a pig of a job and damage the asphalt?) And any advice about things to be careful about when re-tiling?

Many thanks in advance.

You can lay on top as long as you dont mind the increased level.

Apply a slurry coat first - this is a mix of dry floor adhesive and acrylic bonding agent. just paint this on and let it dry, then tile as normal.

Use a single part flexi adhesive.

tpt said:

You can lay on top as long as you dont mind the increased level.

Apply a slurry coat first - this is a mix of dry floor adhesive and acrylic bonding agent. just paint this on and let it dry, then tile as normal.

Use a single part flexi adhesive.

Click to expand...

Many thanks!

Another question : if using same size tiles, would it be better to lay them exactly over the existing ones,i.e. with the groutlines in the same places, or to vary it? (This would involve cutting them all as existing whole ones start at the wall and stop just behind the kickboards).

Thanks to anyone who helps!

really wont matter either way. TBH just forget that the base is tiles once you actually start with the job. Lay your cuts properly to suit the new floor.