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Replies

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  Kieran Ray March 23, 2010 at 11:15pm

  In theory yes this is correct but my personal preference is to have a minimum of 100mm MOT type 1 compacted underneath. I believe this is true of most people.
  
  As you may have seen on programs such as ground force they never used MOT and just laid on the soil.
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  Anthony Toop March 23, 2010 at 11:27pm

  Agree, when ever i have helped out a builder friend with some small patio work, he always used an MOT sub base.
  
  I was just curious as to wether it was best practice for small work or a bit overkill, would the 70-100mm sub base also hold true for say, a single paviour wide (450mm) path?
  
  Kieran Ray said:

  In theory yes this is correct but my personal preference is to have a minimum of 100mm MOT type 1 compacted underneath. I believe this is true of most people.
  
  As you may have seen on programs such as ground force they never used MOT and just laid on the soil.
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  Kieran Ray March 23, 2010 at 11:31pm

  I must admit tomorow I am extending a path by 4 slabs so I am only laying on a muck bed, I beleive the originals are just on sand, they have been there 40 years + though.
  
  Anthony Toop said:

  Agree, when ever i have helped out a builder friend with some small patio work, he always used an MOT sub base.
  
  I was just curious as to wether it was best practice for small work or a bit overkill, would the 70-100mm sub base also hold true for say, a single paviour wide (450mm) path?
  
  Kieran Ray said:

  In theory yes this is correct but my personal preference is to have a minimum of 100mm MOT type 1 compacted underneath. I believe this is true of most people.
  
  As you may have seen on programs such as ground force they never used MOT and just laid on the soil.
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  Boxelder Landscapes March 24, 2010 at 6:57am

  I'm starting to lay a 80 sqm patio this morning 100 - 150mm sub base. It makes no difference if the patio is 1sqm or 100 sqm as the sub base is there to support the slab, the weight doesn't increase the larger the patio.
  I've been laying slabs for 20 years on type 1 sub base and never had to re-lay, I've had to re-lay plenty that were layed on just sand with no sub base though
  
  Anthony Toop said:

  Agree, when ever i have helped out a builder friend with some small patio work, he always used an MOT sub base.
  
  I was just curious as to wether it was best practice for small work or a bit overkill, would the 70-100mm sub base also hold true for say, a single paviour wide (450mm) path?
  
  Kieran Ray said:

  In theory yes this is correct but my personal preference is to have a minimum of 100mm MOT type 1 compacted underneath. I believe this is true of most people.
  
  As you may have seen on programs such as ground force they never used MOT and just laid on the soil.
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  David Grimes March 27, 2010 at 2:35pm

  when i price a job big or small i all ways include type 1base i . i advise what i think about the base then give the client the options
  
  to have a base or not if they say no i point out we will not cover any settlement
• PRO

  Graham Parker March 27, 2010 at 9:24pm

  Karl
  
  Im sure you meant to say the Geotextile under the base? can't believe anyone would lay paving without a base material.
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  Richard@www.seasons-garden.co.uk March 28, 2010 at 10:24am

  For slabs, unless the ground itself is unstable then 4" of sand/cement bed @ 6:1 should be ample for normal foot traffic. Otherwise I'd use a membrane then 2" Type 1 compacted plus 2" sand/cement bed.
  Never had any issues with this and for patios anything more is overkill IMO.
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  Anne Macfie March 28, 2010 at 9:59pm

  I always specify a minimum of 100mm Type 1 for any patio.