hi all, external wall of breeze block, successful scratch coat dried and suck perfectly. 2nd coat initially at 4:1 after drying came away from the wall in sheets when dry. I thought the sand cement mix was not strong enough so re-did again 2nd coat at 3:1 but this is also starting to sound hollow when tapped as it dries.
i've done this before but don't understand why it wont stick. The back side of the render that's come off has a sandy dusty finish. Using a float and pushing hard to get the mix to stick, building sand at 8mm using a plastersiser onto a rough scratch coat.
I made sue i put it on on a cloudy day and covered it to slow the drying down
I have rendered a 6m*3m wall as part of the same job and its stuck properly.
can anyone help?
should i be throwing the topcoat on, is a float enough pressure?
really frustrated!
i've done this before but don't understand why it wont stick. The back side of the render that's come off has a sandy dusty finish. Using a float and pushing hard to get the mix to stick, building sand at 8mm using a plastersiser onto a rough scratch coat.
I made sue i put it on on a cloudy day and covered it to slow the drying down
I have rendered a 6m*3m wall as part of the same job and its stuck properly.
can anyone help?
should i be throwing the topcoat on, is a float enough pressure?
really frustrated!