By Noell Legoff. driveway. Published at Friday, January 18th, 2019 - 17:58:21 PM.
There are 2 methods you can employ as the bed for block paving, one, you have fully compacted sand making the sub base and the laying coarse much firmer, achieving a much flatter surface. To achieve this you need your sand approx 10 – 15mm higher than the finished screeding height, this surplus sand is screeded off to the correct height and then you lay your block paving.
Brush kiln dried sand over the entire area making sure all the joints are full to the top. Then give them a compacting with the plate compactor, leave surplus sand on top of the the driveway so when the vibrating plate passes over it, it will spread about filling any joints which may require more sand.
Before they begin the cleaning job, the company should provide you a rough estimate of how long they would take to complete the job, depending on the area of the surface and the possible need to re-sand the area or add a sealant at a later date. They should also give you an idea of how long the effect would last before you need to hire their services again.
Using a tight string line to get the screeding rails to the correct finished height prior to screeding the sand, check for level or falling towards any drains, a 1:60 fall is required, that’s 1” in height to 60” in length minimum fall to ensure any surface water drains into your drainage system or soak-a-way.
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