here's one for ya'...
im laying marshalls rustic tumbled blocks 150 thick with different widths and various lenths and a 75 x 75 x 150 on 30mm of sand with 100mm of concrete and subase ..problem being the set's vari in thickness and im having to tap them down 1 by 1 to 5mm above channels before i run a whacker over them. It is for a busy town centre with heavy lorries delivering evey day how can i speed up the process but remain within the 30mm sand spec..? and would you say that builders sand is the right stuff or grit sand? ??? ???
will 5ml be enough remember they need to sit 3 / 5ml above channels for drainage. is there that much of a difference in depth that you cant screed a large area and lay them to compliance? sharp sand m8. good luck.
well over 10mm in variation ,and as im already consolidating them with a mallet so the wacker is only setting them down by 1-2mm id like to be able to screed a large area and wham 'em down?
i think i would be tempted to do away with the sand and lay them straight onto 150mm leanmix
sounds like a right bollox of a job
what does the agent reckon?
regards LLL
"ST1 - C7.5 Concrete
A low strength (lean mix) ST1 concrete for general use.
Mix 6 units of 14-20mm gravel, with 3 units of a grit sand and 1 unit of ordinary portland cement.
ST4 - C20 Concrete
A medium strength ST4 concrete for general use.
Mix 4 units of 14-20mm gravel, with 2 units of a grit sand and 1 unit of ordinary portland cement. "
this is the info off the index. "seek and ye shall find."
Never, ever, ever lay any type of paving on building sand.
If you're laying on coarse/grit/sharp/concreting sand, don't over-compact it prior to screeding. use just one pass of the plate, then screed off and lay your blocks, and you should find that they'll compact down more evenly when you've finished laying.
one day you will be calling the shots, then you can do it your way hag. its hard when when you want to do a pro job but the cowboys wont let you. you wont change them m8. just keep up being keen. :;):
subbies have been drafted in to push the job on for christmas. we prep and they lay, i have watched them to pick up any tips and as they are official marshalls certified. they are on price so M2 make the money and they have been screeding off large areas,placing sets and then whacking down as i would have like to have done......but the finnish is far from acceptable to me as there are some very high lips and very low dips in the paving(it is looking rustic but for the wrong reasons) yet nothing has been said and the work continues ...we would have been pulled off the job if we had contiued like this.
