Hi All
I have a wet UFH system on a joisted timber floor with the heating pipes in between the joists, a biscuit screed and then 20mm plywood on top. I'm coming to install LVT and have been advised that I need to overboard again with 6mm ply to create a totally flat floor. I don't want to add more plywood, as being an insulator it will reduce the output of the UFH system. I am looking at laying a self-leveling screed instead as it transmits heat better, however I am still concerned about adding more thickness to the floor and reducing heat output. My idea is to drill a series of 20mm holes in the 20mm ply to a depth of 15-18mm and then screed over, the thinking is that enough of theses holes filled with the screed will allow the heat to rise quicker improving the floors overall performance. Has anyone done this before or have any thoughts on whether this will be a good/bad idea...??
Thanks