Hello all I'm renovating and extending a 1930s house. Most of the house had uninsulated (and very draughty!) suspended floors with a concrete floor in the small kitchen. The old kitchen floor has now been removed and a new damp proof membrane and concrete laid. The suspended floors have been lifted to fill between the joists with PIR insulation, chipboard flooring has then been placed on top. The extension and kitchen will have a new insulated floating floor above the damp proof membrane and concrete so it is the same height as the suspended floors . The plan is to install Wunda Rapid Response (RR) overboard UFH throughout the ground floor. The really big question is what type of flooring to apply on top. Wunda say their RR boards are compatible with pretty much all types of flooring. I was hoping for Amtico on top of a screed (Wunda say 5mm but I'm thinking 10mm) but have read some horror stories about Amtico on Wunda RR. Often the internet has only bad reviews, negative reports, etc. People don't always take the time to shout out when they've had a good experience. Has anyone had a positive experience using Amtico on a screed on top of Wunda RR boards? My other option is engineered wood glued directly to the boards with a flexible adhesive (as recommended by Wunda) with some smaller areas of porcelain tiles (utility and shower room). Does anyone have experience of either of these floor coverings with the RR boards? Really hoping for some good news from you guys Thanks in advance
Forgot to mention, I had a local Amtico/Karndean flooring company around today to measure up for the job. They haven't laid over this type of system before so contacted Wunda who gave them the 5mm screed response. They weren't happy with that so contacted their local Mapei rep who said in his personal experience the screed on these types of systems has a frequent tendency to blow causing big problems with any LVT laid. They said he discouraged them from accepting the job.
I think the wunda system 5mm is fine, use a decent fibre based compound, go 10mm if you wish, prime first
Very risky installing a 2.5mm vinyl tile over this type of system. Think you will be better off with something more solid like engineered wood or tiles as you say.
