 Foundation SINKING SLAB-TYPE FOUNDATIONS In rare cases a concrete slab foundation may fail. Usually this is due to bad drainage, ground movement, subsidence or poor construction. The problem will usually be noticed when doors that used to open and close start sticking, or a gap appears between the skirting board and the floor/carpet. With brick construction a small crack may begin in the foundation and slowly work its way up the wall as the building moves and the crack widens. On timber frame construction the problem is not as readily apparent, only a small crack at the foundation may be visible. This type of foundation problem can be repaired. First of all, any drainage or water problems need to be addressed. Water that flows toward the house or tends to pool near the building, as well as water from down spouts, needs to be drained away from the building. A concrete leveling company that can "mud jack" or lift the slab will need to be hired. They can usually repair the foundation in one day without too much disturbance to your home. The work to raise the slab involves lifting the carpets and drilling one or more small holes through the foundation slab. A special concrete mix under pressure is then pumped into the area under the slab. Raising it and returning it to its original position. In cases where the ground under a portion of the building is unstable and "mud jacking" alone may not be adequate, piers can be sunk. These piers are then attached to a bracket mounted along the outside edge of the foundation’s slab. This holds the building in place, giving it the rigidity and structural integrity necessary. | Welcome to BIS | About BIS | Home Inspections | Get Started | Technical FAQ | Contact us |
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