Got 3 areas coming up where part walls are being knocked down and I have to fill the holes. Then lay over with Karndean. Sizes are approx 2ft x 6" and about 4" deep. Last time I did it I used visqueen sheet and filled it with screed and granno. But ceramic were going down so didn't have to worry about drying time. Is this the best way? Or should I use something like ardex 35 mix. But that will be pricey.
your looking at making a smoothing compound something it is not designed to do. you need a sand and cement mix. but then you have drying times. Mapei do a product called 'topcem' as pointed out above. It is designed to be used the same as a sand and cement mix but has additives that makes it fine to be layed on after i think 7 days. It still needs a smoothing compound over the top tho as it is a deep fill concrete. Anyway, this thread got me thinking. Would you all benefit from a course that covers concrete floor types and construction, what you can use and what you cant for deep sections? mixing concrete and why a certain mix etc? I ask as this is something we could add to our course list, do you think we should offer a course like so?
Yeah, a real world subfloor prep course would be very beneficial, we all know the floors we have to tackle everyday are less than perfect.
Ardex a55 rapid with chippings to fill the gap then screed over the top at the same time that's what I've done before and never had a problem
how much is a bag of ardex 55? like i said above, using the wrong product. For example i can mix 1 tonne of sand and cement for £100 quid. Ardex 55 is 10kg bags? so you would need 100 bags to mix the same as what i can mix. Anyone have a price on 55 at moment?
It say here anything over 10mm add aggregates Isn't it about £30 a bag ? I'd have though 1 bag would be enough to do what's needed with chippings added
Ardurapid 45 all the way. Great stuff, never failed. Really, really fast, and solid. Fill em in, prime and screed.
