Control of suction is critical to avoid cracking,as has been said. Hiding one behind a downpipe is always good,if possible. Check with manufacturers but I believe it's 9m for block work.
Sometimes an exp joint can work to your advantage in terms of breaking up the run into more manageable sections. You need to be a member in order to leave a comment. Sign up for a new account in our community. It's easy! Already have an account? Sign in here. Recommended Posts. Posted March 14, edited. Hey all, My architect has specified Thermalite shield block for the exterior walls. My building supplier doesn't stock them and suggests Celcon standard block is equivalent.
Any advice welcome! Cheers Edited March 14, by pocster. Share this post Link to post Share on other sites. Declan52 1, Posted March 14, This type of block has a tendancy to crack badly ESP on large walls like gable ends. When applying the final coats, make them about 6mm thick. Finish this off with a wooden float, rather than a steel trowel or float, until you get the texture you want. Dry dash and roughcast finishes are not really suitable for use with aircrete unless the correct strength render mix is used or reinforced render system adopted.
Finally, a common misunderstanding with Celcon blocks is that the scratched surface seen on some of them is there to provide a key for render.
This is not true at all. The only reason these scratches appear is because of different cutting processes used at our different factories. If you do come across our blocks with scratched surfaces, remember, the scratching makes no difference to applying render and they have exactly the same properties as plain faced ones.
Do Thermalite blocks need rendering? The only thing about Thermalite blocks is that they create an extremely soft substrate and therefore can be tricky to render.
Ideally, Thermalite blocks need finishing with a material that matches them in softness and flexibility in order to prevent cracking. Can you paint Thermalite blocks?
A painted wall of Celcon blocks will often be perfectly satisfactory in areas with limited access, for example in plant rooms. Paints of most types can be applied direct to the surface of the blocks. After normal preparatory work, the paint should be applied following the manufacturer's specific recommendations.
How do you render over Thermalite blocks? Do concrete blocks need render? Single coat proprietary renders on standard texture blocks should require no pre-treatment.
Pre-treatments or raking back mortar joints are advised on paint quality blocks using traditional renders and also may be necessary when using proprietary renders See render manufacturer's literature.
What are lightweight concrete blocks used for? A lightweight concrete block is an engineering control that may help reduce heavy lifting and carrying. The lightweight concrete block is a concrete masonry unit CMU made of expanded aggregate to reduce the density and weight compared to standard concrete block.
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