rendering on blocks

ellsbells · Posted: Mon May 07, 2007 6:06 pm Post Subject: rendering on blocks

Please help i am having trouble with rendering on thermal blocks and turbo blocks with the render blowing can anyone help with the correct mix i should use or any prep work i should or could do first been told not to p v a as this bridges it??? cheers

Robert too · Posted: Mon May 07, 2007 7:49 pm Post Subject:

I will be interested in seeing the responses from the guys actually doing it ,

as a specifier , i always ask for concrete blocks as an outer skin to receive render

noseall · Posted: Mon May 07, 2007 8:26 pm Post Subject:

i for one would not use lightweight (high suction) blocks on an external situation.

saturate the blocks with a garden hose.

good luck.

Ron Gamma · Posted: Tue May 08, 2007 1:37 pm Post Subject:

I'm keen to know the answer as well.
I'm about to render some medium density blocks and want to avoid a c*ck-up.
Usual rendering style consists of trying to press it on with a trowel gradually descending to standing about 3 foot from the wall and lobbing handfuls of muck at it until it stays put.

brist · Posted: Tue May 08, 2007 4:38 pm Post Subject:

SOAK THE WALL MIX 4 TO 1 AND ADD A CAP FULL OF OPTIMIX TO EACH MIX.

jamcb · Posted: Mon May 14, 2007 9:50 pm Post Subject:

hi, i suggest you contact thermalite technical department and submit the question to them, they will for sure give you the correct advice.

claude76 · Posted: Tue Jun 05, 2007 7:57 pm Post Subject:

wet your wall do a 3 sand 1 cement mix render your wall then get a piece of wood about 6inches long hammer nails through it and scratch the render moving along in a wave motion.then leave to dry and do a second coat this is your finish coat.the first coat is to take out any uneven bits sticking out or holes etc that need filling.if u do one coat u normally see the block shapes through it once it dries but also depends how thick u put it on.normally u do 2 coats also seals it better.