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C O M M O N F O U N D A T I O N R E P A I R S
FOUNDATION CRACK REPAIRS
All concrete cracks. Hairline fissures are common in old as well as newly poured concrete because concrete shrinks as it cures. Usually these cracks are cosmetic and have no structural significance.
Larger cracks however, can be cause for concern. They are indications of deeper structural problems that will increase with time.
Cracks 1/4" and larger must be repaired.
Additionally, these cracks allow for moisture intrusion. This will eventuallyu cause the rebar, the structural steel buried in concrete that gives it reinforced strength to oxide, expand and cause concrete spalling.
FOUNDATION CRACKS wider tht a piece of paper and up to 1/4" are commonly repaired with epoxy. On foundation stem walls it is a common practice to inject epoxy into the crack and then bolt steel straps over the crack.
FOUNDATION CRACKS larger than 1/4" are normally repaired by saw cutting out the crack, usually 12" on each side. This opens a space large enough to drill holes into the existing foundation and install new rebar. Then a new concrete replacement section is poured. The new concrete adheres to the newly installed rebar and the rebar holds the new concrete to the existing foundation.
SLAB CRACK REPAIRS
Cracks in CONCRETE SLABS are usually associated with settlement.
The repair involves saw cutting out the crack, usually 12" on each side. This allows a space large enough to drill into the existing slab for the installation of new rebar. A vapor barrier is laid for moisture protection, a 4" sand base laid and then a new concrete slab section is poured. The new concrete beds on the sand base and adheres to the newly installed rebar.