Merit, I used to see floors like that in Popley, Basingstoke. I was always under the impression it was just an additive to the power floated concrete. I never came across one there with any moisture problems unless it was due to leaks. I've latexed a fair few with green bag some years ago and had no issues.
They was not power floated then or old subfloors. The process of power floating forces moister down and seals the top. Hence a very slow drying process. As it happens im testing one at moment. Going to read meter later this afternoon. The concrete is 5 " deep and 10 months old. Its a existing building that had new concrete laid so has always been sealed from outside weather. So it should be dry then? anyone want to have a guess at what the RH will be?
This is the top, bit of plaster on it. That's the thickness of the corner piece I took out, it sound hollow when I tap it? Like its just sitting on top of a concrete base
The patchy bit on the underside looks like fibres. There's so much crap on the floor and areas where they have filled in that have cracked, I'm going to jumpax over it rather than risk it.
well what i can tell you is its a bonded top screed. (laid to thin) it almost looks like ashfelt? you sure it isnt ? It cant be powerfloated at that thickness. Going back to how thin the layer is. It may be a regular sand /cement top screed that has a additive added to it. Its hard to say. If you fancy posting me that bit i will be able to tell you what it is !
Yeah it is brittle, i don't know what ashpalt looks like mate. Definatly too thin, sounds hollow when u tap it in most parts. It's not the same as the black concrete we was talking about before.
