What is a sub-base for patio?

The sub-base is the main load-bearing layer of paving construction. A well-designed sub-base should evenly spread the load of traffic, whether pedestrian or vehicular, down to the sub-grade, also known as the formation level.

Can you lay new patio slabs over old ones?

With rigid/bound bedding (mortar or concrete) it is highly unlikely that the old bed will perfectly accommodate the new paving, so it should be removed prior to laying new. There may be a temptation to lay a new bed directly over the old, but this, too, is not always a sound plan.

Can you lay a patio without cement?

The best alternative to cement is to use a sub-base of sand. While this isn’t too tricky (see our ‘how to lay paving slabs on sand’ section) it isn’t the most secure way of laying a patio. Unfortunately, the slabs will often begin to sink and shift eventually, plus, weeds will make their way through the sand base.

Can you lay a patio without sub-base?

You do need to put something under paving slabs. Paving slabs should not be laid directly on to soft ground or grass. What’s crucial to patio laying success is a sub-base to provide the support paving slabs require. You’ll need a sub-base, which is the main load-bearing layer of your patio.

How deep should a sub-base be for a patio?

Site Preparation. The recommended depth you’ll want to dig to is about 150mm or 6 inches from the finished patio level. You can use a tape measure to check your depth is correct and once you’re happy you can compact the soil using a Vibrating Plate compactor, also known as a Wacker Plate.

Can you put gravel on top of paving slabs?

Yes, you can. Nidagravel gravel grids are the ideal way to stabilise gravel that is to be laid directly over concrete, tarmac and block paved driveways. In fact, a gravel grid is the only way you can install gravel successfully over a solid slab.

What is a resin patio?

What is a Resin Bound patio? Resin Bound patios are naturally beautiful, stylish and very practical. They are made from mixing high quality dried aggregates and UVR resin, which is trowelled to produce a uniform, even and consistent finish.

Is it best to lay slabs on sand or cement?

We’d always, always recommend bedding slabs down. Whilst you may get away with it in some instances, the vast majority of slabs won’t stay put when laid straight onto sand. We’d recommend bedding the slabs down with a simple mortar mix each and every time.

What do I need to relay slabs?

How to relay your paving slabs

  1. Four small pieces of wood.
  2. Sharp sand.
  3. Cement.
  4. A plastic bucket.
  5. A spade.
  6. An electric drill with a mixing paddle attachment.
  7. A pointing trowel.
  8. A stiff-bristled brush (do not use a brush with metal bristles or wire wool as this might damage the paving slab)