Posted: Thu Aug 09, 2007 8:58 pm
Having spent ages worrying about the lack of depth of some of my drains, I am following advice and haunching with concrete. Some parts of the drain once haunched give me no opportunity to add sub base in fact I have only managed to coverr with about 50mm of concrete in parts. I have added subase along the drive up to the concreted section and can now get moving with adding the paving blocks. What I have is a ST1 sub base bordering a concrete slab covering the drains. Will water tend to wash the bedding sand from under the blocks that sit on the concrete? Would it be advisable to add a shovel of cement to the bedding sand for blocks over the concrete?
Cheers in anticipation
Andi
Cheers in anticipation
Andi