I'm currently renovating the down stairs of my house. It is 200 years old
and has very low ceiling (about 7 foot).
The downstairs of the house consists of two living rooms, a dining room and
a kitchen. All the floors are bare concrete with the kitchen and dining room
having had a floor leveling compound put on them to level the floor. There
are no pipes or wires in the floors.
The floor is slightly below grade (1 inch). SWMBO has decreed the
Kitchen floor - slate tiles with under floor heating
Dining room - that wicker carpet stuff, I think it is called seagrass
Living room 1 - Carpet
Living room 2 - real wood floor (with underfloor heating)
Previously the kitchen tiles were so cold in winter the bottom of my feet
would go numb standing on them even with socks on.
The living room carpet became stained (mouldy) in areas where furniture put
pressure on the carpet.
So my considerations are - I need something that will insulate the floor and
prevent damp coming through but be so thin as to not raise the floor level
by too much. I was thinking along the lines of super proofing all the floors
then laying 6 or 10 mil plywood throughout (except where the underfloor
heating would go - I would get either 6 or 10 mil heating insulation board.
I really need to avoid battoning the floor - I just don't have the headroom.
Also I really can't afford to excavate the concrete floor.
Would this set up give me the desired result (i.e. solid floor, well
insulate, damp proof and thin)?
Is super proofing a good idea or would laying something like 6mil polythene
How would I attach the ply without compromising the damp proof membrane?
(The insulation board is supposed to be attached with a flexible tile
Is ply under carpet or seagrass a good idea?
The solid wood floor will be just below grade level - is this ok? I have
heard solid wood below grade is not advisable.
I've heard sea grass is supposed to be glued to the subfloor, is ply ok for
I heard talk of a vapour barrier - is this the same as a damp proof
Finally - is 6 mil board solid enough for all the above floor finishes or do
I need to go thicker? (10 mil, 18 mil, etc?)
Thanks so much in advance.