Grano Screed - TilersForums.co.uk | Tile Forums

willbones · 31-07-2007

A couple of days ago I put down a grano screed to level out kitchen floor. The screed is about 15 mm thinest and about 40 mm thickest. It has a DPM underneath it. The screed is compressivley very hard but it quite crumbly. I'm going to put SLC over the entire surface before I tile it. Question is whats the minimum time i can leave it before i put SLC down and tile? The screed was made from 8 bags of grano, 4 sharp sand, 2 cement with only a little bit of water to get it to go off. Some reckon that this is nowhere near enough cement but got the instructions of a very reputable builder.

Will

CJ · 31-07-2007

Give it a week

**Dave** · 31-07-2007

It should be left at least 1 week for every 25mm of screed .........

If tiled too early then the floor will sweat and then debond the tiles from substrate........

clarke · 31-07-2007

My mate does conservatory bases and cocrete flooring for a living and he always goes by the rule of a week per inch for drying.
another way is to put a rubber backed doormat on it and check it every few days, if its 'sweating' underneath you know theres still moisture in the screed (that also proves to the customer its still wet if theyre hassling you to get the floor done)

steg90 · 05-08-2007

I thought a week by cm of drying?

**Dave** · 05-08-2007

it is deffo 1 week per 25mm