help with moisture under wooden flooring

hi123

hi
we had wooden flooring (hard wood oak ) laid down last year,ground floor lounge,dining and conservatory
lounge and dining area had board onto which we had dpm underlay and wood laid as floating floor(no nails)
the floor started lifting off after a couple of months,brought the joiner again who lifted part of floor increased the gap
this year it has lifted again,have had moisture meter ,gave a reading of 18 at 1 place rest was about 12,what can we do now
if its moisture causing it why has it happened in conservatory which is concrete and we waited a long time after construction for the fllor
please please help with suggestions
thanks in advance

fluffymuffy

Sounds like condensation. Is the floor laid on an insulation layer? If not then water vapour in the air will pass though gaps in the floor and condense on the cold surface below - especially in colder rooms such as conservatories (at night and in winter).

hi123

thanks
i am not clear about insulation underneath,what exactly should i be looking at

hi123

hi
any one with ideas,have had 2 people come and give me different opinion
one says the floor needed to be nailed,other says its because of damp
what can i do please help

Tall_Tone

Hi there
The solid wood will grow slightly when damp and shrink when it dries.
Do you have a DPM under the wood?

As Fluffy mentioned you could have condensation forming and this will pool above the dpm but under the floor. This is one possible reason for the high (18) meter reading. The most common would be a small leak.
The easiest solution to general damp and growing wooden floors is a cheap dehumidifier.
R
TT

hi123

thanks
its not just a little expansion,the floor has lifted off 6 inches in the middle
there is dpm layer put underneath,the joiner who visited this week is saying its the dpm which has caused the sweating
he wants to take whole thing off,take dpm away and lay the floor nailed on the chipboards underneath and in conservatory he wants to glue the thing to concrete
is that the way to go