Hi,
I m pretty in expierenced when it comes to rendering, so generally steer clear of it. However, on the very few occasions that i have had to do a bit i ve used the guide that church (i think...) put up on here, and have never had any problems.
However, i ve done a small is area 3x3m max on the side of a house that i was doing a lot of overboarding and skimming in and it s gone proper tits up.
I applied a scratch coat of 1;3 with 3in 1 waterproofer gauged exactly as instructed and with fibres. I then left it to cure for 5 days before returning to top coat. Top coat went on 1;2;8 again with fibres, floated up and sponge finished, looked fine. However when i went back a week later the topcoat was cracked and hollow in some places, totally crap:RpS_crying:.
It was much worse at the bottom of the area with no cracks higher up, it s generally a shaded area and it s been cool and damp so im pretty sure it s not been got by the sun.
I ve hacked off all the topcoat ready to re-apply and put in some extra scoring to key to with the grinder, but am worried because i don t actually know why it went and what to do to prevent a repeat
. I was planning to damp down, then prime with sbr/cemant before applying the topcoat again, with more fibres and slightly tighter ( the previous one was upto 10mm in places).
Can anyone offer any advice/ reasons as to why it blew? I did nt damp the scratch coat down much as id used waterproofer in it to control suction.
I really need to get it done tomorrow so any help would be greatly appreciated.
Thanks
Greg
I m pretty in expierenced when it comes to rendering, so generally steer clear of it. However, on the very few occasions that i have had to do a bit i ve used the guide that church (i think...) put up on here, and have never had any problems.
However, i ve done a small is area 3x3m max on the side of a house that i was doing a lot of overboarding and skimming in and it s gone proper tits up.
I applied a scratch coat of 1;3 with 3in 1 waterproofer gauged exactly as instructed and with fibres. I then left it to cure for 5 days before returning to top coat. Top coat went on 1;2;8 again with fibres, floated up and sponge finished, looked fine. However when i went back a week later the topcoat was cracked and hollow in some places, totally crap:RpS_crying:.
It was much worse at the bottom of the area with no cracks higher up, it s generally a shaded area and it s been cool and damp so im pretty sure it s not been got by the sun.
I ve hacked off all the topcoat ready to re-apply and put in some extra scoring to key to with the grinder, but am worried because i don t actually know why it went and what to do to prevent a repeat
. I was planning to damp down, then prime with sbr/cemant before applying the topcoat again, with more fibres and slightly tighter ( the previous one was upto 10mm in places).Can anyone offer any advice/ reasons as to why it blew? I did nt damp the scratch coat down much as id used waterproofer in it to control suction.
I really need to get it done tomorrow so any help would be greatly appreciated.
Thanks
Greg
