rendering on blocks

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7 May 2007
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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 :cry:
 
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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
 
i for one would not use lightweight (high suction) blocks on an external situation.

saturate the blocks with a garden hose.


good luck.
 
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.
 
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SOAK THE WALL MIX 4 TO 1 AND ADD A CAP FULL OF OPTIMIX TO EACH MIX.
 
hi, i suggest you contact thermalite technical department and submit the question to them, they will for sure give you the correct advice.
 
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.
 
Use SBR slurry straight 1 to 1 SBR latex bonding and portland cement paint on with roller and stiff brush leave to dry the your scratch coat
 
Use SBR slurry straight 1 to 1 SBR latex bonding and portland cement paint on with roller and stiff brush leave to dry the your scratch coat

There's your answer boys :wink :Maybe wet the sbr/cement before you spread the scratch....
 

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