The Brew Cabin

1. Can I use hardcore (broken paving slabs, broken concrete including large lumps) blinded with sand and compacted in place of DTp1.

2. When constructing the sand base, having spread the sand ready for compacting, where do you walk when doing the compacting on the prepared sand base ?

1 - NO! Read the website - the sub-base is the most critical layer for longevity of an elemental paving such as block paving. Skimping on the sub-base will cost you dearly in the long run, as you will get differential settlement.

You know all those drives you've seen with block paving that's sunken and rutted - guess what they used as a sub-base?

2 - You can walk on the sand when it's first compacted, but, once it's screeded off to level and rady for laying the blocks, you should NOT walk on it at all.