I hope someone can advise me. We are in the middle of a building project that will have wet underfloor heating put down over a large area (three zones in a rectangular area of 11m x 8m). There is an existing floor level that will need to be broken out over about half of that area; the rest is a new extension which currently has a concrete beam and block base floor down but nothing else (so it's a lot lower). Our builder is apparently going to get all of the floors to the same rough level, then put on insulation, then the underfloor heating pipes, then a screed, and then we will have Karndean laid as the final finished floor surface. I'm wondering about a few things: How thick is the screed that is usually poured on top of the heating pipes? And once laid down, how long does it take the screed to dry before we are able to lay the Karndean? Does the surface of the screed kick up dust once it's dry, and if so is there anything we can do to minimise that? The reason is that we are having a painted kitchen installed, but the painting doesn't happen until after installation. If the timings work right we can have the kitchen installed once the screed is dry enough for that (they say 2 weeks), then get the flooring laid, and finally the painting. But if those times don't work I don't want to have dust from a screeded floor blowing around while wooden kitchen units are being painted! Any advice would be very welcome. JM.
Screed will be dry in two weeks and it's over UFH Must be Anhydrite ? I suggest you find out before the kitchen goes in because it will need the top ground off when it's dry enough assuming that's what it is
Normally a depth of 50mm-75mm. Drying times are 1mm per day as a rough guide. Liquid screeds can be force dried quicker but 2 weeks sounds pretty quick unless it’s a rapid setting screed. Sent from my iPhone using Tapatalk
Also the screeds should be covered to improve its drying after its laid but that never happens. So maybe find out what the screed manufacturer recommends to cover and leave that down Sent from my iPhone using Tapatalk
Roughly 1mm per day up to 50mm then double that for anything more, the laitance will need grinding off which should be done by the builder, and your flooring installer will need to put down a floor layers screed before any LVT is fitted. The only way to know if it’s dry enough is to perform a Rh% test a minimum of 4 weeks later any earlier and you will get false readings, every job is different and we can only give a rough guide it needs a proper site inspection to determine what preparation needs to happen and how long before you’re ready for installation. Sent from my iPhone using Tapatalk