Where my garage floor & driveway meet is sinking. The first 3-4 feet of garage floor is cracking and the 2 feet of asphalt driveway next to the garage has sunk 1 - 1.5 inches. This has happened over the past 2-3 years.
Any ideas why and what to do to resolve?
This could be a number of things. First and most obvious would just be settlement of the ground under and around your garage, if your garage and laneway is under 10 years old. cracks in the concrete of your garage is
80% of the time caused by contractors not using re-bar ( Re-enforcement ) in the concrete slab. A underground conduit or tree root could cause this as well. The slab takes the most punishment at the door where it is usually sloped slightly and the car would hit it first with most of its weight.
Concrete area would have to be chopped out back to the crack and more fine gravel or stone dust packed into place. Re-bar would then have to be inserted into the edge of the slab and then a new section of the slab can be re -poured with concrete. The driveway part has probably settled as much as its going to unless there are bad cracks in it as well, then it will have to be chopped out as well, re-packed and re-paved.
Replacing the damaged areas would be the best aesthetically but is quite high in cost. If you are looking to keep costs lower I would look into specialized "Mudjacking" companies. They are able to pump a cementitious slurry underneath the slabs and raise them back up. It wont make cracks look new but I have seen slabs lifted back in place I never thought could of been fixed.
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