Originally Posted By: jane molina This post was automatically imported from our archived forum.
On a hairline or 1/16 foundation crack or cracks , what kind of concrete patch do you use to seal them with for best results ? There are alot of products out there . is the concern for slab foundations the same as for a raised one
Originally Posted By: Guest This post was automatically imported from our archived forum.
In all likelihood Jane, the horizontal cracks are structural concerns typically caused by frost heave, expansive soils or excessive compaction of the soil surrounding the foundation by equipment. That situation requires remedial work to secure the integrity of the foundation and none of the products I listed would “fix” a horizontal crack.
I’m curious how a stair step is created on a slab foundation. Did you mean a slab footing and cmu foundation?
Jane, it's 4:30 am in California what the heck are you doing awake, much less thinking about concrete.
Originally Posted By: roconnor This post was automatically imported from our archived forum.
It really depends on the type of crack.
A horizontal crack in a basement wall is bad news, because walls span vertically from the floor to the footing. Once the wall cracks that way significant strength is lost ... recommend an SE for that.
For vertical hairline cracks that are not moving (careful there) ya can epoxy inject them which works well with stabilized hairline cracks, or rout and seal with a polyurethane sealant. There are also other hydro-active injection products that can be used for active water leaks.
Recommend a good SE if ya suspect anything unusual, or recommend a good foundation repair contractor for minor non-structural cracks.
Just my 2-nickels ... 
-- Robert O'Connor, PE
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