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Old 01-11-2009, 09:13 AM   #1
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floor screed failed

hello i was wondering if someone can advise me on my options, i have built an extension with a insulated concrete floor, i pva'd the floor and added an additional 50mm screed to bring up to finish floor level minus carpet and underlay. My screed was mixed in a cement mixer by buckets ratio 3 grit sand 1 cement, the mix was balling when adding water and as the sand had been sat there a couple of weeks i thought the water content would be suffice without adding too much as when compressed it stuck as a solid in your hand, so i didnt add any more water, i layed 16m2 and left it a week to cure, but it has dried with a crust and as a powder underneath in sections and the grit in the sand seems to have stopped it binding properly thus if you rub it with your finger you can chip away and it breaks up down to the conc base, i have thought of self leveling over the top after pva again but then i still have the problem of the screed being not right underneath. Any advice would be appreciated


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Old 01-11-2009, 11:59 AM   #2
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Did you tamp it and vigoroulsy compact it when putting it in place?


Remove it and start over.

Balling is a common problem when mixing the mud that dry, this is why it is generally mixed by hand with a hoe.


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