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Posted: Wed Mar 25, 2009 1:56 pm
by Jakeyba
Alright here goes probably a stupid question but.. I am intending to lay some stable blocks on a sand & cement screed. Jointing will be with kiln dried sand. What I want to know is shall I run a whacker over the paved area once laid or do I run the risk cracking the screed below? Further what ratio would you reccomend for the sand and cement? Any info much appreciated.
Cheers
Posted: Wed Mar 25, 2009 4:31 pm
by oioisonnyboy
norfolk and chance jakeyba
It seems you are getting confused perhaps. blocks laid on compacted screeded sharp sand (No cement anywhere near) and jointed with kiln dried sand = flexible construction (block paving, modular flags etc.)
sharp sand and cement bedding is used for laying larger slabs, flagstones etc which requires a more rigid construction
see on the main site under block paving for more detailed info. use of a wacker over any kind of bound (i.e its hard and contains cement) bedding is not advisable, it shakes the f&ck out of the wacker and the person using it, very noisy and will not do the material any good, possibly cracking it and rendering it useless.
once you have laid your blocks on screeded sharp sand ONLY apply kiln dried sand and then wack, sweep, wack sweep till joints are full.
hope this helps, and have a dekko on the main website too...stop any wisecracks about daft questions and daft people :;):
Posted: Wed Mar 25, 2009 5:13 pm
by Jakeyba
Fair comment mate. Cheers
Posted: Wed Mar 25, 2009 6:15 pm
by Pablo
In Scotland a Jakey is the kind of alcoholic that doesn't undo his trousers to take a p#ss. I bet you never knew that. :laugh:
Posted: Thu Mar 26, 2009 8:28 am
by Tony McC
I've seen stable pavers laid on a sand-cement screed and jointed with KDS and it seems to work, although it's not a method I would have chosen. I can't see the need for a bound laying course if this is a reasonably wide area and you have (or can construct) firm edge courses.
The job I saw was a 1m wide path, and so I couldn't really argue that laying two edge courses at 200mm width on a moist mix and then screeding a completely separate 600mm wide sand bed was worth the effort.
One lesson learned, and the reason I was asked to look at the project was because of the damage done to the clay stable pavers by the plate compactor, The contractor should have used a neoprene sole plate to protect the pavers, as all that rattling cracked a few and chewed the corners off about 15% of them.
Posted: Fri Mar 27, 2009 6:51 pm
by loudog
What is a neoprene sole plate? I have to lay a clay paved drive so would i need this to compact my pavers when i apply the KDS.
Posted: Fri Mar 27, 2009 6:57 pm
by Dave_L
It is a rubber protector that slips over the steel baseplate of the vibrating compactor that protects the clays from the severe vibration/jumping action of the plate itself.
Posted: Fri Mar 27, 2009 10:05 pm
by loudog
oh i see, can you hire them or are they part of the plate itself
Posted: Fri Mar 27, 2009 11:22 pm
by Injured
They are seperate and the hire shop should have one to suit the wacker they have.