S
sammoseley
Hi,
rendered half my new garage today, I was really happy with it till looked again an hour later and it started hairline cracking/crazing. Gave it a few doses of the mist spray from the hose over the next few hours but still cracking, even worse now. Pretty sure I should have wet it down more, eg. just after floating it.
I soaked the blocks beforehand and soaked the scratch coat which was nearly dry before putting top coat on.
I'm pretty sure the mix was right so I guess it just dried too quick, but I'm not too sure how I stop that happening next time ie. next weekend !!!!
background is medium density block.
Scratch coat 4:1 plastering sand:cement plus waterproofer, 8mm ish, soaked blockwork beforehand - did this yesterday
Top coat today 5:1:1 plastering sand, cement, lime 5mm ish, soaked scratch coat beforehand
didn't over work it, laid on, ruled off floated then final light rub with dry sponge, looked the business till it started cracking.
any advice much appreciated on how to stop the next lot cracking up
cheers
Sam
rendered half my new garage today, I was really happy with it till looked again an hour later and it started hairline cracking/crazing. Gave it a few doses of the mist spray from the hose over the next few hours but still cracking, even worse now. Pretty sure I should have wet it down more, eg. just after floating it.
I soaked the blocks beforehand and soaked the scratch coat which was nearly dry before putting top coat on.
I'm pretty sure the mix was right so I guess it just dried too quick, but I'm not too sure how I stop that happening next time ie. next weekend !!!!
background is medium density block.
Scratch coat 4:1 plastering sand:cement plus waterproofer, 8mm ish, soaked blockwork beforehand - did this yesterday
Top coat today 5:1:1 plastering sand, cement, lime 5mm ish, soaked scratch coat beforehand
didn't over work it, laid on, ruled off floated then final light rub with dry sponge, looked the business till it started cracking.
any advice much appreciated on how to stop the next lot cracking up
cheers
Sam