I have a garage that has a 4″ reinforced concrete slab for a roof, that also doubles as a deck. The structure is at least 40 years old, and has developed three hairline cracks that extend parallel to the shortest span ( ie: from side to side). These cracks let water in at a slow drip rate during a rain storm, or snow thaw.
Aside from the annoyance of water dripping into the garage, I am concerned that if left unchecked, the water moving through the slab will cause the rebar to rust, and the slab to start to deteriorate.
I tried to use concrete paint on it a few years ago to stem the tide, but after one winter, the paint began to peel at the cracks (I assume this is due to water permeating the concrete at these points). What is the best way to seal the cracks, while still allowing the top side of the slab to be used as a deck?
Replies
since you mentioned snow, that means you have ice building up in the cracks and that will lead to failure faster then any rust ever could. Ice will tear up concrete with cracks with the expansion cycles that happen daily.
Find out what caused the cracks in the first place.
Id consider probably going with a tiled top on the patio . Under the tile or cap put down a anti fracture membrane then the exterior tile. I think you could get a waterproof membrane on top of the anti-fracture membrane. Then seal up your grout. (each anti-fracture membrane company will also have remedies for cracks of varying sizes) If looking to a contractor search out the commercial tilers they will most likely have the knowledge of anti-fracture and fracture remedies. Not saying residentials dont, but commerical tilers spec probably have more expericence with them.
I think that would be a more pleasing and longer lasting solution then patches. more here will pitch in ideas.
You might have a serious look through http://www.grailcoat.com . Will cost you more than concrete paint, but it might be the fix you need.
Formerly BEMW at The High Desert Group LLC