How to level floor between rooms / avoiding damp

[Murdoch77]

We’ve had a wall knocked down between our kitchen and dining room to make it more open but the kitchen floor is currently about 1cm higher than the dining room floor. We’d like to level it out but want to know the best way to do this without causing any damp problems. The dining room has wooden floorboards and the kitchen has about 1cm of concrete on top of old quarry tiles. The plan is to remove the concrete layer but should we remove the quarry tiles as well? The quarry tiles just seem to be laid on top of sandy soil.

In summary, what’s the best way to level out the floor? Could we have LVT or would stone tiles be better? How do we prevent damp rising through the floor? Any advice would be greatly appreciated.

 

[ree]

OP,
1. Lower the kitchen floor. Dig it all out. The 10mm is irrelevant but constructing a floor on sand is no bueno.
2. Lower the line of brickwork courses where the old dividing wall used to be.
3. The new DPM going under the kitchen floor should reach over the old dividing wall, & flop up over the dining room floor - it can be cut & adjusted after pouring a new slab.
4. Research on here for countless descriptions for pouring a kitchen slab.
5. Note your bench mark for the new kitchen FFL is the dining room floor board level. You will end up with a slight drop at the kitchen door threhold.
6. Is the kichen a later extension than the house?
7. Check the dining room joist tails for rot. Slip off-cuts of DPC under them.
8. Post pics when you've dug out to depth.