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Kota Blue Limestone

Posted by James Brett on August 31, 2020 at 8:27pm in Landscaping and Paving Materials and Advice

Good evening all,

 

it's been a while since I have been on as I left the industry a few years back. I hope you are all keeping well. I have recently moved house and we have decided to lay 900x600 Kota blue limestone pavers. I have done the usual prep of a 100mm sub base and then a 50mm full bedding layer of sharp sand and cement at 4:1. the slabs have gone down well over around 25m2, in the course of laying them we had some delightful weather resulting in a plastic sheet being laid across to stop the rain. I have now noticed that 5-6 random pavers sound like they are loose and as you step you can hear a slight crunch noise. I have never had this issue before. This is what I have used previously on Black Limestone and there has never been an issue for me or my customers. 

any suggestions as to the cause of this, I know it's remedy is to remove, break out the bedding and relay on a new mix but I'm concerned that all the laving will lift now 

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Tags: paving, limestone
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Replies

  • PRO
    Honey Badger September 1, 2020 at 10:49am

    Hi James, I'm know expert in paving, but I do lay the odd patio.

    On the paving expert wedd site it shows with limestone you should make a bridging bond between lime slabs and mortar using SBR and cement mix that you applie to the bottom of the slab. I have successfully used this method to repair old patio's. It appears to work well. The other methods I have used it to wet the bottom of the slabs on the outside course. Which causes suction.

    Hope that helps, Dave

    • James Brett > Honey Badger September 4, 2020 at 1:30pm

      Thanks Dave, this is weird in the fact that I haven't experienced this issues before with this stone. I haven't used the SBR mix before and it's never been an issue. 

      I did email Tony from Paving Expert and he has suggested that these stones are perhaps clearance one which have been sat in the yard for a while. If they are they quite often get dusty and this causes issues

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