Browse Forums Paving & Concreting 1 Mar 30, 2008 11:47 am I have an old slab that used to be my garage and want to pave over it. Areas around it will also be paved (under pergola and up to car hole.) I have crushed rock up to the edge of the slab, but I'm wondering what depth, if any, sand to put over the concrete?
The slab is fairly flat, no huge mismatched edges, so I figure a light sprinkling of sand will help level the pavers with each other and stop rocking/noise if they move a little. Or does it need the same depth as over the crushed rock? Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Re: Paving over concrete 2Mar 31, 2008 8:52 pm if you pave on the slab then continue on to a crushed rock base over time the crush rock area thru subsidense and movement will drop further than the concrete area
any paving on concrete should be on mortar or if the pavers are calibrated then a rubber based exterior adhesive will work to i would suggest to excavate the areas not concreted drill in y12 reinforcment bars into the side of the pre existing concrete and pour a rough screed concrete slab to new areas, y12 bars stop slab seperation acid etch the old concrete and lay pavers on mortar or adhesive laying on sand will work but only for a year or so then you will have to redo the whole job again Da Vinci Outdoor Living Architectural landscaping http://www.davincioutdoor.com Re: Paving over concrete 3Nov 12, 2008 2:35 pm Sorry to hijack this thread... but what do you mean by "if the pavers are calibrated"
Also what sort of gap would be recommended for paving over concrete? Would you still use fine sand in the gaps, or mortar with silicone at intervals for expansion? Thanks Re: Paving over concrete 4Nov 13, 2008 7:49 pm calibrated means the pavers are individually measured and machined by hand to the miilimmeter in size etc.
grout gaps are generally 4mm in pavers but the travertine i lay has 2mm gaps, granite tiles 3mm etc if you rigid pave (on mud) then you need to do a rigid grout with the possibilty of expansion joints depending on application if the paving isnt enclosed on 2 or more edges then you probably dont need expansion joints but if you have reactive soils/ sub base then you may need expansion joints with all rigid paving you need control joints in base slab use gap sand on flexible (sand paving) in grout joints if you want grout joints but on sand generally pavers are butt jointed Da Vinci Outdoor Living Architectural landscaping http://www.davincioutdoor.com As most others have posted above the install isn't compliant. The pipe is meant to be covered in loose soil or sand, the pipe has holes in it that leaks out a termicide… 10 4659 Much a do about nothing. You can see the fall heading to the actual drains. Stormwater ingress will be minimal and it's far better to have the top sitting flush rather… 12 5208 Just get as close as you can without hitting the posts. Once you are close to the edge of the path the chance of cracking is minimised. 7 7359 |