Ufh overlay boards

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vik2001

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I'm mixing a new extension with the existing house. The old part of house is just a concrete slab no insulation. I need to build this height up by 25mm overlay boards for ufh to match the new extension.

Can I just put 25mm ufh overlay boards straight over the concrete, then lay a floating engineered oak floor on top. Will it stay warm or do I have to worry about heat loss? If so which overlay boards? Doing a very large area.
 
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Yes you can - but overlay is around 20 odd mm and then the engineered wood is at least another 15mm so you will be well over the 25mm difference you are looking for.
 
Madrab said:
Yes you can - but overlay is around 20 odd mm and then the engineered wood is at least another 15mm so you will be well over the 25mm difference you are looking for.
Click to expand...

Which overlay can I use around the whole bungalow over concrete for this purpose?
 
Most of the overlays would be suitable but it would be down to heat output and whether a 16mm PEX would be used - usually they're an EPS400 board as it's supportive and the engineered wood can sit directly on top.
 
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Can laminate flooring be installed the same way directly onto the boards or would it need a underlay with it on top of the eps board?
I'm also wondering if any screeding needs to be done on top of the boards and pipe first?
 
Last edited:
Nope - laminate/engineered wood and real wood flooring can all be laid directly on top of the overlay, as long as it is a high density EPS. Only time you need to use something on top would be if you are going to carpet and things like furniture, tables, point loading etc, then you can use a thin 6mm cementitious board like 'nomoreply' or other similar makers backer boards.
 
Ok thnx. It's a bit confusing because when I'm looking at eps boards it saying check to see which underlay is recommended for laminate or engineered. But from what yr saying no underlay is required and the laminate can sit directly ontop of eps without underlay
 
nothing wrong with a 2mm foam underlay, cant see it causing any issues with heat transfer
 
Shouldn't have any impact on heat transfer, though it may add a little cushioning to the wood floor which wouldn't be a bad thing I guess. As suggested though, if the MI specifies it then that's the best approach as they'll have done/got lots of testing/feedback with their product.
 
I'm being advised by builder not to use laminate and to go with engineered over the ufh boards. He said laminate will cause issues down the line.
My preference is laminate due to costs but I dnt want to run into any issues.
 
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