Evening chaps. I've been to look at a floor today to measure up for Karndean. The floor has a concrete base then a 20mm/25mm grano screed. The grano screed has cracked terribly and theres movement in a couple of places. Any thoughts on this. I have mine but I want to see what you guys think. The customer will be viewing this so be good and the builder who did the grano screed is a very good friend of his. I was told he's done quite a few before of the screeds and he can't understand what's happened to this one. All decent input will be appreciated.
Could be not bonded or dried to quick or the compression strength it to high or not mixed correctly or all of it ?
From what was said I think the concrete underneath sucked all the moisture out. He said the builder unibonded it but to my reckoning it was too weak a mixture.
Not used proper primer and used to much water in his mix id of said, seen a fitter who used to work for the same firm I do and he used to water his bag and bottle so much it went white like that.
Has anyone got a ratio equation I can use. I want to level 26sqms at 20mm. First mix I want to put granno to bulk out then next screed to make smooth and level. How much granno to use on first mix per bag. Only granno'd smaller areas before and that was yonks ago.
Renovation has fibres in it mate. I do half a bag granno to one unit screed. Not sure on the size of the granno bag though. It's the one I use from Jedens.
So your gonna need 32 bags of screed and 16 bags of chips then 6 bags of screed to finish? That sound about right?
Yeah thats what I figured. Gonna be expensive. Hes been quoted just over £1000 for pump screed. Working on say £25 per bag including profit then labour its going to be cheaper.
