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Answers found at www.pavingexpert.com in my opinion.
Really depends on whether what you're laying is calibrated or not, adjusting the sub base depth comes with uncalibrated....and good luck if you're on that ticket :->
Personally i don't find it difficult to work to +/- 10mm. Its more critical with block paving as you want a nice even thickness of sand to prevent any variation in settlement. Its easy with block paving though as you can fine tune once you put screed rails down.
Not sure what eugene is refering to regarding calibrated vs uncalibrated.
Sub-base should always be an even depth with variation in slab thickness taken into account with extra bedding mortar.
When I first started hard landscpaing many years ago, it was impressed on me on my first footing and base excavation that I needed to keep 'a level bottom'(which I found amusing at the time!), but soon realised why. A concrete base was the norm for all paving with an allowance of 25mm for a wet mortar bed, so a variation of +/- 10mm was the very max. Old habits dye hard and it's a method i have used to this day.
I cringe now when I see a driveway excavated to varying depths and goodness knows how many ton of road scalpings are spread about and the block paving laid on a sand bed of =/-50mm or more.
Not sure what eugene is refering to regarding calibrated vs uncalibrated.
He read bedding layer for sub base and went off at a tangent.....sorry!
Eugene
Sorry, what Iam trying to find out is there a code of practice that covers landscape works as there is with highway works.
Yes, the most informative source is the little green book, called (amazingly..:-) :
"Landscapes Architect's Pocket Book" which also refers to the relevant BS Codes of Practice.
There is also a companion "Little Blue Book for Architects".
I would assume all Designers have this on their desk/bookshelf ?
If not you need to remember a lot of figures and BS codes or have access to Heather's Specifications
I can't scan in the back of the book but its Isbn is 978-0-7506-8348-7
would anyone have access to this book and could let me know if there is anything about the tolerances allowed for laying a 30mm thick granite dust laying course.
try paving expert.com