Which Block for rendering?

[dabomb3k]

Hi guys I've got a bricked garage , it has 4 pillars which take the bulk of the weight for the roof etc, but the front has a single skin brick wall and a window, to the left of the window the brick has inevitably decided to start leaning and i wouldn't say is safe anymore, I want to take it down and use breeze block to rebuild it, however I would like to finish it off with some render afterward,

I also have a solid stone wall that I plan on rendering smooth and I want to make it a bit higher so was planning on putting a few blocks flat on top then rendering the whole thing smooth?

I read somewhere I shouldn't use aerated block but this seems the cheaper and easier option as I can also cut them to size with a standard saw,

My question is could I render over these if I also used a mesh an nails before applying not the render and if not could someone point me in the direction of a uk site with the best block to use?

Travis Perkins and b and q both seem to do a 7.3n aerated block and they do a medium density concrete block?

What's the best option with cost and cutting of block in mind for rendering after?

Thanks in advance

 

[tomfe]

You can render aerated block, many people don't like it (I am one of those), as the blocks thermally move quite a lot and make the render fail. You could put a fiber glass mesh in your scratch coat or use eml as you have said . But the far easiest and cheapest it to use a medium, dense or light aggregate block, you can cut them with a bolster and mash/club hammer or buy a cheap 9" angle grinder and put a cheap diamond disk on it. These are also cheaper than aerated blocks.

 

[noseall]

Lightweigt aerated blocks are too unstable and too high suction for rendering applications. Not impossible but way down on the list on the bezzy scale.

A rendering friend of mine prefers the dense (7n) concrete blocks above all others especially when spreading the polymer based renders.

 

[dabomb3k]

Thanks guys, aggregated blocks it is, trade point have them for £1.21 a block inc VAT, will go with that and hope I can cut em without shattering them