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Posted: Sun Sep 13, 2009 8:15 am
by Mikey_C
I planning on putting clay block paviors in around the edge of an Indian sandstone patio. They are left over from the drive and therefore are 65mm thick, as I have allowed 75mm for the flags and bedding this only gives me 10mm under the blocks, what’s the minimum I can put under the blocks?
cheers. 
Posted: Sun Sep 13, 2009 10:14 am
by lutonlagerlout
why not dig out and bed the edging pavers on 150 mm of leanmix?
then put the MOT into the middle and wack to 70 mm down
LLL
Posted: Sun Sep 13, 2009 11:01 am
by Mikey_C
I've only put down about 80-100mm of type1 for the patio, the blocks don't need to provide to much lateral support it's only stopping the flags from spreading, I was planning on using free edge restraining methods under the flags at edge as described here. I just thought 10mm might be a bit thin for mortar or concrete? Would C20 with 10mm gravel be ok.
Posted: Sun Sep 13, 2009 2:54 pm
by lutonlagerlout
TBH
the flags are unlikely to spread mush if you use a wet mix,why not just lay the slabs,then when they have gone off a bit scrape back the MOT and bed the pavers on 100MM + of leanmix,then haunch the edge
or you could do the pikey version and lay the pavers on their sides <cough cough >
worth doing it right mikey,10m of mortar on type 1 is worthless IMHO
LLL
Posted: Mon Sep 14, 2009 6:38 pm
by Just
I am also just about to lay my slabs and have started thinking about edges. I have about 150 MOT whacked and plan to use a 40mm Mortar bed for the slabs. I am planning to use a single line of granite setts, hopefully a similar colour to my Indian SS Moorland Green flags. I have studied the site pages and although I think I have enough sub base depth to scratch out for the setts, which I think will be 75mm deep? I am not sure on the mix I should be using to lay and haunch them? Should I still use sharp sand here? I thought 4:1 wet but then I thought that will probably be a different colour to my slab joint mix? Should I use 12mm joints on the setts as well?
Posted: Mon Sep 14, 2009 8:16 pm
by lutonlagerlout
most edgings/setts/cobbles need to be laid on leanmix (20mm aggregate 10:1 cement damp mix) then haunched with a wetter mix
i wouldn't consider laying them on anything less than 100mm of leanmix
LLL
Posted: Mon Sep 14, 2009 9:07 pm
by Mikey_C
Appreciate your help LLL, I think I knew the answer I just didn't want to admit it, because it would mean scaping out the type 1 I have just put down 