How much sub base do i need?

Question

Could anyone give me a good rule of thumb for a patio?

Charles · Answer

For a patio, a good rule of thumb is allow 1 m² per person for seating space, plus extra for paths and furniture.

Kind regards, CB Builders & Son

Aaron · Answer

sub base  should be no less than 100mm 4inch kind regards aaron

Dave · Answer

A good rule of thumb for a patio sub-base is 100–150mm of properly compacted MOT Type 1, depending on the ground conditions.

Typical installation build-up is:

• 100–150mm MOT Type 1 sub-base, compacted in layers
• 30–40mm full mortar bed (sharp sand and cement mix)
• Paving slabs installed on a full bed, not spot bedded

This normally means excavating to around 150–200mm below finished level.

For firm, well-draining ground, 100mm may be sufficient. However, on clay, softer ground, or areas prone to movement, we always recommend 150mm for long-term stability.

The most important factor is that the sub-base is installed in layers and mechanically compacted, as this is what prevents sinking, rocking slabs, and future movement. Also ensure the patio has a slight fall (approx. 1:60) away from the property for drainage.

In our experience installing patios and landscaping projects, the sub-base is the single most important part of the job. If done correctly, the patio will remain solid and level for many years.

Russ · Answer

A good rule of thumb is 150mm heavily compacted type1 stone (MOT) as a sub base and give yourself 30-35mm for bedding (cement) make a paste up ( watery cement and PVA mix) paste the back of the slabs before laying.

John · Answer

if this is for a concrete slab, then you will normally need 100mm hardcore, sand and 100mm of concrete

Paul · Answer

Dependent on the ground obviously,  but 4-6 inch of well compacted hardcore

Lee · Answer

100mm of  type 1 for foot fraffic  150-250 in drive way could use different materials (ie brick rubble) for cheaper option

James · Answer

Good evening rule of thumb 
Basic maths 
Length x breath X depth 
That will give you the cubic meteredge of type 1 needs for your sub base the same rule for mortor underneath the slabs 
Hope this helps

Roger · Answer

The minimum amount of type one you should put in is 100mm but i would always put in 150mm well compacted with a wacker plate .

Amy · Answer

Minimum is usually about 100ml depending on how soft the ground is

How much sub base do i need?

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