Underfloor heating over two types of floor

[Morninglory]

Hi,

I'm knocking through downstairs and fitting wet underfloor heating. One half is suspended timber, and the other half is currently just 100+ year old flagstones on the soil. I'm going to get rid of the flags and put in a new floor, but am I better doing solid floor or suspended timber? Solid floor seems better for UFH, but does it matter that the one UFH system will be over two types of floor structure? I figure the solid floor will just take longer to heat up but keep the heat longer.

Thanks

 

[Mr Chibs]

Lots of ufh manufacturers do kits for both types of floor.

with regard to your new floor, concrete is best, finishing in either stone or ceramic tiles.. as these are good conductors of heat. and the heat up times can be quick. An hour for example.

You are right, once it’s up to temp, it stays warm. Mine is coming on once a day at the moment in the morning.

 

[Morninglory]

Thanks for replying. Half the downstairs floor in suspended timber is staying, so would I need two separate zones for the UFH, or do it all as one? It's a tiny terraced house 8x4m so each zone would be 4x4m.

 

[Mr Chibs]

I’ve a single floor kit on mine, two loops, but can extend to four, but it would be all or nothing.

Try to get a small manifold One for the Suspended floor, and one for the new concrete, you’ll be able to tweak to control it per floor.

if you have rads as well, get two zone valves and two thermostats, that way you can have just the floors running and/or the rads, or the hole lot.

Mine is a polypipe zru unit.

If I can help more, just ask.