Hi all,

Doing a job next week where I will be overlaying exisiting floorboards with 10mm cement board from U-Heat then installing UFH. I would normally use an F Ball product called Stopgap 700 Flex, which is a blinding alternative to Fiberplan

Anyway my normal supplier hasn't got any in at the moment. I've spoken to Tile Giant (Aberdeen), who has Latexplan in stock

Has anyone used LP in the construction that I have described above?

I would scrim and wipe some spf into the joints of the cement boards first

i use latexplan when installing amteco or lino etc, its a bit "thin" for over underfloor heating! IMO.

its a bit "thin" for over underfloor heating! IMO.

Goes up to 10mm like Dagger...

Originally Posted by merlecollins

Goes up to 10mm like Dagger...

i understand what you mean, but, if your floor is not bob on in the firstplace then 10mm is not that much! plus there is thermal expansion and contraction to concider...just a thought!

to be honest ultraplan maxi is a little more expensive but goes up to 30mm in one hit!!!

but i would still use fibreplan! the fibreglass reinforcement gives me the confidence it wont fail!

just my opinion!

I,ve used latexplan trade over UFH at about 6mm depth and been totally fine up to know.
The instructions for latexplan and latexplan trade says both are fine with ufh.
I wouldn't want to go much deeper with the height issue,cost and not neccessary.
Kev

The instructions for latexplan and latexplan trade says both are fine with ufh.

Aye mate, but it was the timber/backerboard construction I wasn't sure about

Would have thought as long as the wood floor is well screwed down with no deflections would be fine.
As a thought would 6mm hardiebacker be a better option over the wood floor?
Suppose if using a thermal board the heat in theory should be reflected upwards and not as much onto the timber possible eliminating some contraction??
If it had been a wet ufh then i'd use deffinetly use fibre but still think latexplan would be fine
Good luck
Kev

If the sub floor would have concrete or screed i would have said Latexplan Trade, seeing as its overboarded timber with backer boards i would go for Fibreplan for added strength.

fibreplan is the only screed for wood!

and would be my preference over backerboards!!

regards

Dagger.

Spoke to the Mapei technical dept and they say fibre plan would be best but also if the timber is well screwed down Latexplan as well would be totally adequate.
Looked on the technical data sheets of latexplan and trade and both say fine for wood.
Also the compound is to go over the 10mmcement board and not the wood.

Regards
Kev

Cheers Kev mate

To be fair the wayrock is rock solid - I am then going to adhesive stick and screw every 200mm the backerboards down - I would expect Latexplan is adequate