Sep 27, 2003, 3:48 PM
Post #5 of 6
Personally, I've never seen anything built of concrete that doesn't have cracks. In the US, I have used a combination of concrete impregnated with chopped fiberglas for garage floors so that the cracks don't appear. Concrete cracks aren't necesarily structural in nature. The steel in the concrete expands and contracts at a different rate than the concrete itself as does the rock in the concrete as does the ground under slabs and footings as well as walls at different levels. All this expansion and contraction causes mostly surface cracks because the finish on concrete walls is made of a substance of virtually no structual value. I have determined, from experience in this field that having a good roof, good surface drainage and with the proper finishing techniques, including sellador and a plethora of other typical Mexican alchemy by a good maestro, your cracks will be kept at a minimum. I am not saying that all cracks are benign but that I wouldn't worry too much unless you see a large separation or a crack enlarging quickly.