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Old 01-12-2012, 05:47 PM   #1
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foundation joint-concrete floor crack repair?


is it necessary to repair an interior crack between basement floor and foundation joints? the basement is pretty dry and has a sump pump. and i don't think the crack affect structure of house. and its about 1/8" around the entire foundation joint and basement floor

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Old 01-12-2012, 06:36 PM   #2
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foundation joint-concrete floor crack repair?


Depending on the initial construction, if it is a concrete or block basement wall built on a strip footing (16" to 24" wide by 8" to 10" thick), it is very common for the 4" slab to be poured later on top of the strip footing and is not connected to the wall or footing in any way. If this is the case in your home, the crack is only due to the long term concrete shrinkage of the slab and movement due to temperature and the crack is to be expected is not a problem. Apparently, your drain tile and sump are working as expected since you do not have any moisture problems.

If it bothers you, it could be caulked with a quality caulk that remains flexible if you can get the caulk into the joint.

This type of construction is very sound and is done for many good construction reasons. The "true" floating slab provides a positive resistance to any lateral movement and 3-1/2" thickness is required in some codes. The other reason is to provide a better construction schedule and in cold climates allows any buried basement utilities to be installed after the first floor is capped and then the slab can be poured and cured under controlled conditions. Also, restraining the edges of the slab by a connection to the footing or walls can create cracks in the open area of the floating slab.

Dick

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Old 01-12-2012, 06:59 PM   #3
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foundation joint-concrete floor crack repair?


Quote:
Originally Posted by concretemasonry View Post
Depending on the initial construction, if it is a concrete or block basement wall built on a strip footing (16" to 24" wide by 8" to 10" thick), it is very common for the 4" slab to be poured later on top of the strip footing and is not connected to the wall or footing in any way. If this is the case in your home, the crack is only due to the long term concrete shrinkage of the slab and movement due to temperature and the crack is to be expected is not a problem. Apparently, your drain tile and sump are working as expected since you do not have any moisture problems.

If it bothers you, it could be caulked with a quality caulk that remains flexible if you can get the caulk into the joint.

This type of construction is very sound and is done for many good construction reasons. The "true" floating slab provides a positive resistance to any lateral movement and 3-1/2" thickness is required in some codes. The other reason is to provide a better construction schedule and in cold climates allows any buried basement utilities to be installed after the first floor is capped and then the slab can be poured and cured under controlled conditions. Also, restraining the edges of the slab by a connection to the footing or walls can create cracks in the open area of the floating slab.

Dick
it look like the foundation is block of 24"inch wide(since it look like there are consistent vertical line on the foundation). and i do belief the concrete floor was added after the foundation. so basically its natural, and i don't have to worry about it.

however if i want to build a parameter wall for remodeling, i don't have to seal the crack?

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Old 01-12-2012, 10:33 PM   #4
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foundation joint-concrete floor crack repair?


I would seal the crack if building a wall, usually they were caulked.
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