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Old 05-24-2012, 06:11 PM   #1
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Old Footing and slab on grade - is it a crack r expansioin joint


The slab is approximately 50 years old, and I'm replacing a few rotten wall studs along the perimeter of one edge of the slab.

I found what, at first glance appeared to be a crack just inside the 2x4 PT sill. The crack was 7' long, 1/8 inches wide, and 4 inches deep. Upon further probing it looked too even to be a crack, and it ended as a perfect corner - where the foundation jogged.

Is it possible that where stem wall of the footing rises up to meet the sill it is only 4 inches wide, and the slab was poured separately allowing for an expansion gap? Has anyone ever seen a footing that might be similar to this one? See diagram...
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Old Footing and slab on grade - is it a crack r expansioin joint-footing-diagram.jpg   Old Footing and slab on grade - is it a crack r expansioin joint-p5240078.jpg   Old Footing and slab on grade - is it a crack r expansioin joint-p5240082.jpg   Old Footing and slab on grade - is it a crack r expansioin joint-p5240084.jpg  

Last edited by lakemans; 05-24-2012 at 07:11 PM. Reason: Attach diagram
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Old 05-24-2012, 06:36 PM   #2
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Old Footing and slab on grade - is it a crack r expansioin joint


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Old 05-24-2012, 07:06 PM   #3
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Old Footing and slab on grade - is it a crack r expansioin joint


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Originally Posted by lakemans View Post
The slab is approximately 50 years old, and I'm replacing a few rotten wall studs along the perimeter of one edge of the slab.

I found what, at first glance appeared to be a crack just inside the 2x4 PT sill. The crack was 7' long, 1/8 inches wide, and 4 inches deep. Upon further probing it looked too even to be a crack, and it ended as a perfect corner - where the foundation jogged.

Is it possible that where stem wall of the footing rises up to meet the sill it is only 4 inches wide, and the slab was poured separately allowing for an expansion gap? Has anyone ever seen a footing that might be similar to this one? See diagram...

Seen a lot of garage's poured that way,but the floor was not level with the stem wall,floors were always 6 inches below the wall.
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Old 05-24-2012, 07:19 PM   #4
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Old Footing and slab on grade - is it a crack r expansioin joint


So you think it's not a stress crack, rather that the slab and the footing were not poured at the same time, and the stem wall was intended to be only 4" wide? Seems a bit thin to support the load of the walls and roof.... Still, it does appear to be designed that way....
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Old 05-24-2012, 07:38 PM   #5
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Old Footing and slab on grade - is it a crack r expansioin joint


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So you think it's not a stress crack, rather that the slab and the footing were not poured at the same time, and the stem wall was intended to be only 4" wide? Seems a bit thin to support the load of the walls and roof.... Still, it does appear to be designed that way....



Yes i've seen a lot of them,the bottom plate just fits on the stem wall.
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