I'm about to have some 8" cores drilled through a concrete driveway in order to run a fence across it. I'll use 4×4 posts, probably cedar, sunk several feet deep and anchored in concrete.
Should the concrete anchoring the posts be level with the driveway? Higher? Lower? Should I do anything special at the place the anchoring concrete meets the driveway concrete? Any other tips for this project from someone who's done it before?
Best Answer
Since there will be now way to insure the concrete will be the same color or will it be able to tie in the texture to make the new pour "go away", neatly slope the concrete up towards the post say about a 1/2" to create a break line where the new concrete meets the old. Try to keep the slope uniform from post to post just so it will look professional. The slope will help drainage, even though the concrete acts like a huge sponge, holding moisture to the post, but it is much better than soil.
New concrete can smear over the old making a mess, but after a few hours, you can carefully clean the old concrete with a DAMP stiff bristle brush, no flowing water, taking MUCH care to not let the brush touch the fresh concrete. You may even wait 6 hrs and still accomplish this task.