We have had a new concrete floor fitted in our kitchen / dining area
the last layer of which was laid a couple of weeks ago. It is made up
of approx. 200mm slab 100mm insulation and 75mm screed. This, I know,
is going to take some time to dry out before the wooden floor we have
planned can be laid. We are not planning to lay the wooden floor
under the kitchen units or in the kitchen floorspace itself. Is it
safe for me to install the kitchen units whilst the floor is still
drying out or is the moisture likely to affect the High Density
Chipboard of which they are constructed. I'm not 100% sure but I
don't think the base edge of the unit is laminated.
Bit of polythene sheet under the edges which are touching the floor, or
PVC tape and leave the plinths off for a few more weeks (inch/week rule
of thumb with concrete) to allow air to circulate under the units.
The basic rule of thumb for setting concrete is that after 24 hours you
can walk on it, after 48 hours you can work on it, after 7 days you can
build on it and after 28 days it will have reached in excess of 90% of
its final strength (it will go on setting for years). If appropriate,
structural engineers base their designs on 90% strength, so after 28
days, it is considered fully cured for structural purposes.
So, if it's been laid a fortnight, there's no problem building on it. As
others have said, if you have plastic-footed units then don't worry at
all, just leave out the skirtings (which you can't fit anyway until the
floor is finished). Otherwise, use plastic (dpm would be a good option
if you have any) to protect the cupboard edges in contact with the concrete.
On Thu, 20 May 2010 02:28:37 -0700 (PDT), aberdeen
Stick a piece of plastic over the slabs and leave for an hour to see
what condensation is collected underneath. If loads, then leave for a
while. If not much you should be ok, provided you do not put
kickboards in place or have draught free areas under the cabinets.
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