Hi everyone, New to this site and have previously used a different one which doesn't seem to work anymore. Been to look at a job today which has a newly laid concrete floor with underfloor heating, water and not electric. Customer is wanting LVT. First question is can i still use a dpm with underfloor heating and should i? Readings are currently through the roof as its new. Second question is will i have to use Fball 700 flex or can i get away with 300hd? Appreciate your time everyone and look forward to the advice.
you cant use a surface dpm over underfloor heating. You need to let the concrete dry normally. As for compound you can use pretty much what you like. Welcome to the forum.
Tremco do a dpm that can be used over ufh, but I've always been told ufh can crack the screed before its fully dry so best not to use one
Merit, there are a few that say you can. But trust me, we do masses of inspections on failed DPM systems. They all have that get out clause in the warranty.
if only i was allowed to post up the pics and the product names...... sadly i cant as all court cases.
Hi Matt and thank you for the info. Do you mean i will have to let the concrete completely dry before i do anything with it and if so what is recommended? Other thing is Matt, should i get the customer to turn the underfloor heating on know to help dry out the new floor? Thanks again.
I'm not 100% but I'd say turning the heating on would help speed up drying out but if not I'm think it's 1inch of concrete will take 1 month to dry out, at least that's what I've been told by a builder in the past. If it were me I wouldn't lay screed untill fully dry just incase it went wrong.
