Anyone have any particular advice on subfloor prep on powerfloated concrete? The concrete is just over 12 months old, in a factory, and been used as a finished surface for foot traffic only, in this time. We will be installing safety floor, so I want to make sure I get the levelling compound right. I am doing a site visit today, but expect it to be slightly greasy, but free from flakes/paint etc Would a coarse pad be sufficient to abrade the top surface? Thanks. Steve. ,
Oh dear......... Well without sounding like a complete arsehole I'd say if you are installing safety flooring you should know the basics on this............. I've done this before...... A power floated concrete is very dense on top and retains a vast amount of moisture. If it's 12 months old there is probably a curing agent sat Nicely on the surface making it look shiny hard and dry!!!!!! If you where doing a site visit did you take a hydrogemeter with you and test for relative humidity or are you the type of contractor that undercuts me on a daily basis with no knowledge on sub flor preparation but can quote for a quick skim and fit........ Let me know your answer and I will offer a bit more advice
Shot blast the surface to get a key Then DPM prime screed They almost aways test off scale the scale for RH%
Correct..... But the reading is key to the dpm you use...... For example Ardex dpm 1c will take 98% in one coat but some others only 92%. The last one I did was 94% so Ardex was used over a 2 coat system. Also shot blasting doesn't always remove the water based acyrlic curing agents ..... We had to diamond grind the last one
Ardex 1c will still require removal of any curing agent as the dpm is only as strong as the bond it can adhere too. I went to rectify a job where the Ardex dpm 1c had been applied to a non pre smoothed floor and popped as the surface wasn't prepared correctly
A few moons ago we did two side by side units, the first we arditex NA straight to the power floated the floor DPM and arditex NA on top, the second the architect insisted on shot blasting DPM straight to the surface to save the cost of a first 3mm of arditex NA x 1000 after paying a "consultant" The first one is still down and as solid as can be after 6 years, the second lasted 12 months and it was up as the dpm gave way. .
Lol, sometimes the more you fuck with the floor the worse it gets lol! Sent from my iPhone using Tapatalk
I am using dehumidifier for few days, then you can use your DPM and you are secure after arditex na. When your NA is dry is time for Altro walkway or similar. Contrax is not very good. www.services.profflooring.co.uk
The dehumidifier helps me every time when the room is wet, the moisture. Reducing the level of RH%. If the concrete is up to 6 weeks old, no one company can give you guaranty for the DPM membrane, if you use dehumidifier you can help the DPM. It works and you don't need to worry to much for the DPM and how much pressure is on the floor. With power floated concrete the process of drying is longer then the normal one. Much more water. Closing the room and leave it inside with heater will be better, but heater must to be off over night for safety reasons. www.services.profflooring.co.uk www.profflooring.co.uk
Power floated floors take years to dry out. You have to grind off top. 2 coat dpm Prime and screed On tapatalk HD
A 150mm powerfloated floor will take about 15 years to dry Easier to take a reading with a probe rather than a box. You need an rh reading before deciding on products imo. Sent from my SM-G930F using Tapatalk
