Posted: Mon Aug 14, 2006 9:35 am
I have dug up an old tarmac drive which had approximately 4-5" of concrete underneath it.
I am breaking the concrete down into lumps approx 6" square and adding other harcore (from previous building projects I have an abundance of bricks, paving slabs etc) to it to give a depth of 6".
My question is whether I would be better adding a thin layer of concrete (again from previous projects I have surplus ballast available) to the top of the rubble to bind/seal it or should I add compavted sand/ballast or other materials instead to complete my sub base?
I am breaking the concrete down into lumps approx 6" square and adding other harcore (from previous building projects I have an abundance of bricks, paving slabs etc) to it to give a depth of 6".
My question is whether I would be better adding a thin layer of concrete (again from previous projects I have surplus ballast available) to the top of the rubble to bind/seal it or should I add compavted sand/ballast or other materials instead to complete my sub base?
