First time posting. I was caulking the 2in wide x 16ft long gap between my driveway and garage yesterday and I screwed it up. I cleared most debris out then put play sand as a base. Then I put foam backer in there but I suppose it wasn't deep enough. It was taking a lot of bottles of caulk to fill the gap. Now the foam backer has risen to the top of most of it. Its basically a covered caulk rope.
Should I just rip out the foam backer and place a new one in there lower down as a I can? Then put new caulk on top. Will I even be able to do that at this point? I was trying to get away with not using as much caulk but it looks like that backfired.
Any advice is welcomed. Thanks!
Best Answer
I'm not sure caulk is the right approach in the first place for a gap of two inches. There are commercial products that do a good job (seen in cases such as pre-cast building walls), but you'd need the appropriate applicator tool and large quantity of material. Typical caulks are only suitable for gaps of up to half an inch or an inch, depending on the product. I'd be surprised if any claim usefulness to two inches.
I think I'd use asphalt patch mix. Clean out the channel to 3" of depth, rinse and compact with water, and install using a suitable tamping tool (a sledge hammer and 2x4 on end to set, flat to finish).
If both of your slabs are concrete, consider renting a diamond saw, cutting the channel to 12" or so, and pouring a proper slab segment with a few bags of ready-mix.