Had a conservatory built.
Concrete floor is about 5" thick and was poured on May 1st ready mixed (5
weeks ago). It was ok to walk on the next day. It also has a DPM under it.
Not knowing anything about the concrete, it's whatever standard stuff that
might be delivered by a contract concrete supplier.
The question I have (and I have researched on google as well but would like
further opinions), is how long after the floor has been poured is it safe to
lay laminate flooring down?
I have a DPM ready to go on top of it and fibre board to go under the
The laminate packs say 1 week per cm which would mean, based on that
advice - 12.5 weeks before we could put the flooring down. Advice across
various google results suggests 6 weeks. Would we really have to wait
another 7 weeks before putting the flooring down or should we be safe to go
next week or even today?
It has been rather warm over the last couple of weeks and the room has been
vented almost every day.
Thanks in advance for any advice.
Standard practice is to tape a small sheet of clear plastic to the floor &
leave 24 hrs. Any condensation on the plastic indicates that its not dry.
If the base has a DPM under it & you put a DPM over it, where will any
moisture remaining go?
Dave - The Medway Handyman
Thanks for the reply. I'll try the plastic tip.
With regards to the DPM, I can happily ignore the advice on the packs and
take the DPM bac? Must admit, it makes sense that trapping the moisture in
isnt wise. I suppose at least without the DPM, there is scope for it to
What happens when the moisture seeps into the fibre board? Is it the
kind of material that swells when it gets wet? And would laminate
flooring allow moisture to get out? I'd be VERY careful to make sure
the concrete is dry enough because if you mess up now it will be
expensive and a real bother to put things right. It's only a few weeks :-)
A L P
A L P
I have an old house and its scullery has a floor which is slightly below
ground level. It's also an unattractive plain cement floor. So I decided one
day to put down some vinyl to brighten it up. A week later I found that I
was treading on puddles under the vinyl. What had happened was that the
evaporation of moisture had been stopped and the water had just built up. I
tool the vinyl off and everything was restored.
Moral - don't trap the evaporation.
Thanks again for all the responses. We're going to leave it for a good 8
weeks now. Makes sense.
I will ask, we did actually take the DPM back. Is it really really necessary
if there's a DPM underneath the concrete? Is it essential that we put the
DPM on top of the concrete underneath the fibre board?
I can always go and buy it again if I need it.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.