Replacing Chipboard Floor and Prep for UFH

[jazzhands]

Hi

I have a small bathroom 2.4x2.5m divide by a step up across the middle which is where the bath and basin go. Plumber needs to remove the chipboard floor on the step level to plumb in new bath and vanity.

Considering what to put back down once he's done and that will also be suitable for UFH.

Is there a cement insulation board that will go directly onto joists (with noggins) that I can then put UFH mat onto and if so what thickness?

<or>

Should I board it with WBP ply first then overboard with insulation board and if so what thickness?

What would you guys do?

Cheers
Gaz

 

[Andy Allen]

I would go ply and 10mm insulation board..

 

[Time's Ran Out]

2 different floor levels would mean 2 seperate Ufh mats!

 

[jazzhands]

2 different floor levels would mean 2 seperate Ufh mats!

Why is that? Can I not just cut the mat and drop the cable down a corner between the two levels?

 

[Time's Ran Out]

Just as seperate rooms should be treated as individual zones and not taken across doorways and threshes, if there is horizontal movement in these 2 floor levels the cable could stretch and break!
Check with UFH supplier before you install as it may affect your guarantee.

 

[jazzhands]

Ah ok John, I see what you mean. Thanks for that.