Underfloor heating - Suspended floor thickness question


Postby bemused » Thu Jan 08, 2009 12:59 pm

I want to install underfloor heating in a first floor bathroom with suspended floor. I like the look of "SuperFloor" from YBS Insulation who supply foil insulation and some clever pipe clips that support normal plastic pipe in runs just under the floor boards. It looks pretty easy and maintenance free but I'm concerned that if I add a thickness of ply to the floorboards in order to tile the floor, then add some sustantial floor tiles, will I ever get any heat through?

To minimise the effect I thought I could get rid of the floor boards and just rely on a ply floor plus the tiles. So my question is: If I replace the floor boards with 18mm ply and then tile, will the floor be strong/rigid enough?

Grateful for any thoughts.
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Postby stoneyboy » Thu Jan 08, 2009 8:41 pm

bemused,
Whether the floor will be rigid enough will depend on the size of the existing joists and their spacing.
If you are going to supply the underfloor heating from your CH system you should allow about 2 hours for the heat to penetrate 18mm ply + adhesive + tiles.
end
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Postby bemused » Fri Jan 09, 2009 9:47 am

Many thanks stoneboy. I was indeed expecting to use the CH system for this, so it sounds like I will need an extra zone valve and timer to kick the bathroom heating into action before the rest of the house gets going. Cheers.
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