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07-23-2010, 07:31 PM #1
Horizontal Black Line in Foundation
Never seen anything like this. 1955, single story ranch home. At the right/front exterior foundation stemwall I found a line that had been painted-over. When I chipped a bit of the paint off, I found black asphalt or tar. Looked and felt like the stuff used for a T&G roof. Then, when I was in the foundation crawlspace area, I found another larger line in a different area.
We do have some fairly expansive (adobe-type) soils around here, but there was no evidence of excessive foundation movement. Looks to me like it was originally poured this way. Seems to me that the seismic resistance of the foundation is compromised.
Foundation was bolted at some areas, but I could not find any bolts in the area of the second two pics. The first two pics are at the exterior of a slab section, so bolting could not be verified. Jerry Mc offered an observation that this upper layer is pretty much horizontal and might have been poured to raise the stemwall, like they originally poured it short.
Anyone ever seen anything like this before?
Anyone have any idea as to why this was done?
Any thoughts or suggestions? I will probably defer to a structural engineer, but I am still curious.
Thanks.
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07-23-2010, 08:54 PM #2
Re: Horizontal Black Line in Foundation
I'd defer to a structural engineer. But, if I saw a poured foundation in a 1955 home in MN I'd suspect the foundation was rebuilt or the house moved to a newer foundation. Everything around here built in the 1950's is block.
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07-24-2010, 06:14 AM #3
Re: Horizontal Black Line in Foundation
Jerry Mc offered an observation that this upper layer is pretty much horizontal and might have been poured to raise the stemwall, like they originally poured it short.
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07-24-2010, 07:59 PM #4
Re: Horizontal Black Line in Foundation
Jerry Mc offered an observation that this upper layer is pretty much horizontal and might have been poured to raise the stemwall, like they originally poured it short.
Mr. Alquist: I do believe that Mr. McCarthy is right.In which case, we can think of no good reason for the tar.
John Kogel, RHI, BC HI Lic #47455
www.allsafehome.ca
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07-24-2010, 08:47 PM #5
Re: Horizontal Black Line in Foundation
When in doubt and poured the first part too low.
Drink, Drink, Drink, Pour tar, Drink, drink, Drink, Pour concrete.
Get er done bubba.
Mabey Tar goes well with Asbestos!!
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07-25-2010, 02:07 PM #6
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07-25-2010, 02:55 PM #7
Re: Horizontal Black Line in Foundation
Needed 1 more truckload before the long holiday weekend but, NOOOOO! the plant closed down!
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