BBQ Render Advice on Celcon Blocks

GavinS

New Member
Hi all

New to the site and have read some really valuable advice on plastering and rendering. Great Job..

I know its wrong but its done now, I have built a smoker and BBQ out of celcon blocks which will be lined with 25mm calcium silicate insulation boards to the interior followed by 25mm fire bricks.

My questions are:

How should i bond the calcium board to the inside wall.
I need to waterproof the celcon blocks but do i do both inside and externally.
How soon after laying the blocks can i waterproof the laid blocks.
What should i use to waterproof and do i do that first before a scratch coat.
Finally, what ratio and mix should i use to either waterproof or scratch. I have a jumbo back of bricklaying sand and also a bag of thames wash sand i was going to use for another job as a dry mix with cement for filling gaps to the edge of paving. I also have some plastisiser and SBR to hand.

Many thanks all in advance.

Gavin
 
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