Increasing joist height to match other floors

8 Feb 2008
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United Kingdom
We are creating an larger open plan space upstairs.

One room (older) has joists that are 18mm lower.

We also want to fit UFH using spreader plates between the joists.

I could fit 18mm T and G across the whole floor but then I've got double the wood width so the room will heat and cool more slowly that the other areas.

Is ok to glue/screw 18mm timber on top of the joists only to raise em?

Thanks for the sanity check.
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