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What sub base to use for permeable eco paving

I would be really grateful for some help. I'm going to lay some Hebdon 402 eco paving tiles on a driveway. These will be filled with 60mm of gravel.
I was going to use a compacted MOT 1 sub base but after reading some installation info on the internet I realised that it is recommended that you use MOT 3 sub base because of the drainage properties.
I have found it very difficult to get hold of MOT 3 in the London area (under 10 bulk bags.)
I have asked some landscapers for advice and everyone who I have talked to have used MOT 1 under the paving tiles and said that they haven't had a problem with drainage.
Has anyone had experience in laying these tiles. If so what sub base did you use?
Does anyone know where I can get an MOT 3 sub base from in the London area?
Many thanks
Will

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  • If you need a permeable sub base then a type 3 base should be used, if not just go for type 1.

    Is the sub base needed to make the drive suds compliant?

    In the past we have used a relatively clean 40mm crush to make a semi permeable sub base for gravel grids, in the end we made the base almost 300 deep though. Have a look around and see what 20-40mm aggregate you can get as long as it has minimal to no fines you will be fine, just make sure its compacted properly and topped off with a geotextile fabric.

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    You could try Day Aggregates they can usually supply 10 ton loads of pretty much any type of aggregate you want. Day Aggregates 0845 0654 655

  • Thanks for your responses. I've tried Day Aggregates but their minimum drop is 10 tonnes. I only need around 5 tonnes.
    I managed to find some helpful advice from Bexley sand and Aggregate. I'm going to get 2 tons of 40mm and 3 tons of 20mm and hopefully that will do the job

  • The other option is to talk them down on price.

    Pay there haulage cost and only 5T of aggregate that way it is still worth there while and you get the product that you need.

    Where is your London location as our local guys are very amenable.

  • Haven't used the paver's are they permeable ? If so then surely open graded MOT should be used, Try Loveday in Hemel Hampstead for north and west London, failing that try lafarge aggregates

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