A portion of the asphalt driveway slopes slightly into a narrow grass
strip (2 ft. wide) that abuts a portion of the house. Considerable
water flows down that slope. I want to build a vertical "wall" or
curb where the asphalt meets the grass and channel the water away down
into a steeper slope away from the house.
Is it simply a matter of building a sakrete wall, maybe 6" high? Will
the sakrete adhere to the current asphalt and form a waterproof bond?
Are you planning on putting that curb where there's grass now or
standing it on top of the asphalt?
If you're digging out a strip of grass to put the wall there you'll
probably find that the asphalt has a pretty grotty edge and you may have
to cut it back a bit to get a decent surface to pour the wall against.
If you've got the time and patience you can trim the edge of the asphalt
with a 3 or 4 inch wide mason's chisel and a hand sledge. Wait for a hot
day to do that, the asphalt will be easier to cut then.
Since you're not building a load bearing structure and if you don't
don't mind offending the purists here, you could pour the wall right on
top of the asphalt. I'd get some pieces of rebar about a foot in length
and drive 'em right through the asphalt where the wall will be, maybe
every two feet or so, leaving about 4" sticking up for the Sakrete to
grab onto. You can figure out how to make wooden forms and keep them in
place while the Sakrete cures.
I don't think you need a waterproof seal there, any small crevices will
plug up with dirt fast enough and stop all but the tinyest seepage of
water through to the lawn.
Jeff Wisnia (W1BSV + Brass Rat '57 EE)
"As long as there are final exams, there will be prayer in public
NO, but it redirect enough of the water to accomplish your objective. If
you want it to last a long time enrich the mix. Add about 10 lbs of
Portland cement to each bag of dry sakcrete mix and mix it a dry as you can
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