hi, wonder if anyone could help, weve just put some parquet flooring down but laid it in strips, its block and beam flooring, with 50mm of screed, it has wet underfloor heating underneath, we used the dipping bitumen to bond he parquet straight onto the concrete floor, all is well til the floor warms up then then the strips open up, the floor is 4m x 6m and appears to open up about 5mm accros the 4m width, i presume this is the slab thats expanding, its more noticable this week as weve been plastering and the cracks are visible in the dust (see pic), just wondered if anyone had an ideas how to stop it, dont want to take the floor up again as it took alot of putting down, im not so bothered about the cracks im more concerned that the blocks will lift in a short time withe the continual expanding and contracting.
Parquet flooring underfloor heating cracks
- Thread starter joeybancroft
- Start date
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How old was the slab of concrete the floor has been laid on.
Why was the plastering done after the floor has been laid as your putting a lot of moisture in the air which the wood will absorb.
Was the underfloor heating off while landing the floor. Should be off 48hrs before during and after. Ten turned on low and building up the heat.
Why was the plastering done after the floor has been laid as your putting a lot of moisture in the air which the wood will absorb.
Was the underfloor heating off while landing the floor. Should be off 48hrs before during and after. Ten turned on low and building up the heat.
hi, it was about a month after we laid the cement topping, we did have a dehumidifier on in the roof for a few weeks, yes it was off when laid, its ok when cold but when the heatings been on the cracks appear, im not sure if its the wood thats shriking or the slab thats expanding, or both, we got some more floors to do in the building this year but with slate floor tiles but was worried about those now.
Did you do a moisture text on the sub floor.
Concrete takes 1mm a day to dry out. So a 50mm ( 2 inch ) screed would take 50 days.
Think that's the problem mositure raising up through the wood
Concrete takes 1mm a day to dry out. So a 50mm ( 2 inch ) screed would take 50 days.
Think that's the problem mositure raising up through the wood
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That would be my guess, the water is still coming out of the screed into the wood, probably made worse by the wet trades, but the heat from the UFH is drying the wood out and it is shrinking back.
Agree also would have been better to have got all your wet trades out of the way first and run your UFH on low, controlled at the manifold, rather than via the room stat, which would have helped to accelerate drying of the screed also.
Agree also would have been better to have got all your wet trades out of the way first and run your UFH on low, controlled at the manifold, rather than via the room stat, which would have helped to accelerate drying of the screed also.
hi, cheers would the best thing to do now is leave the underfloor heating on low for the next few weeks say 20c to let the screed and blocks dry out?
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