Tiling a damp concrete floor link to out-house conversion.

11 May 2004
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United Kingdom
I have read a few posts related to damp concrete floors and tiling.

I have a 1960's house where they have linked an small out-house with the kitchen. They have removed the old back door and linked the out-house with the kitchen using a flat roof and a set of french windows.

I have been planning to tile my kitchen floor which has thick chipboard 2cm and lino on top.

This is fine, but when I pulled up the lino in the area that used to be outside (linking kitchen to out-house), there is a damp concrete floor.

The out-house has been converted into a room with a raised floor (which I assume has been damp proofed in some way) this room building is single skin and cold.

My questions are thus:
1. Should I use a bitumen type product on the damp concrete and should I try to dry it out first by lifting the lino and airing it?
2. Should they have put a dpc in that part floor before finishing the conversion?
3. The damp concrete is at the same level as the thick chipboard, so should I raise the whole level of this part of the floor and if I have to what about my upvc doors which are at the level of the concrete as well.

Any suggestions?
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