4 weeks before I would even test it 6- 7 for a dpm, if dpm is layed to soon the sub floor could still be moving which could cause the dpm to seperate from the screed
28 days minimum as the concrete is still going through its shrinkage process. Very common failer of DPM's failing is where the concrete developed stress cracks while drying. These obviously transfer through to the Surface DPM and cracks the dpm. Also the strength of the concrete takes 28 days to become strong unless additives added. Applying Dpms to it before can give a lattice effect like on calcium sulphate depending on how porous it is while curing or it does the opposite and drinks loads of surface dpm. All depends on mix, sunlight exposure and a few other things.
Builder made me do one the next day , dpm screed and 15 msq vinyl safety. No probs with it yet two years ago too. Wouldn't recommend it like but sometimes builder force the issue dont they .
Thats quite a risk what do you mean the builder made you ? You should be telling him when it goes down
must of still been soft ! presume a while ago as on insulation the concrete dont have enough strength for foot traffic until 2-3 days old.
Didn't have any option all the w/cs and cubicles were getting fitted the day after , he wanted it down so I did it, obviously explained to him the dangers but like I said its still solid two years on. Yeah it was a bit soft. Just shows u what u can get away with .
its 50/50 at the end of the day. Either it will fail or it wont. Like playing roulette and going red or black. We have all taken risks, some we win some we loose. My risks are one my own , family or friends houses only.
Yeah that's right 50/50. Most of the time it's not worth thinking about doing , suppose you have to weigh the job up , this one was a crappy old pub bog so I just took the chance. Most of time my work is LVT so wouldn't chance it
i think we will all risk a couple of hundred quid job. When it comes to jobs worth thousands of quid bit like we see UV Cure posting pictures of you simply dont take the risk.
