Underpinning - Minimum Distance without Doing So
Underpinning - Minimum Distance without Doing So
(OP)
Hey All, Happy Friday.
Client is deepening their basement. 2 story building. Adjacent building has a basement. Each building has its own 12" wide foundation wall, but no spread footings, and they are directly next to each other. I'm underpinning my foundation wall, and when all is said and done, the bottom of my new footing will be 10" below the adjacent existing foundation wall.
Question: Do i have to underpin their existing foundation wall (10") so both are at the same depth?
Thanks,
Client is deepening their basement. 2 story building. Adjacent building has a basement. Each building has its own 12" wide foundation wall, but no spread footings, and they are directly next to each other. I'm underpinning my foundation wall, and when all is said and done, the bottom of my new footing will be 10" below the adjacent existing foundation wall.
Question: Do i have to underpin their existing foundation wall (10") so both are at the same depth?
Thanks,





RE: Underpinning - Minimum Distance without Doing So
www.PeirceEngineering.com
RE: Underpinning - Minimum Distance without Doing So
We have permission from other building owner, but I'm just trying to figure out if underpinning the adjacent wall is really necessary. I can't go any less than 10" per the client's request. I understand that you're saying that constructability may require me to go even deeper so they can underpin wall and add the drypack, but again, does a 10" difference in footing elevations require it in the first place.
Thanks,
RE: Underpinning - Minimum Distance without Doing So
Given that your walls have no footing, I'm guessing that you're bearing on some pretty robust material. If that's the case, perhaps a geotechnical engineer would give you the green light to do forgo underpinning the neighboring foundation. I wouldn't be making that call on my own however.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Underpinning - Minimum Distance without Doing So
www.PeirceEngineering.com
RE: Underpinning - Minimum Distance without Doing So
Thanks for your input everyone.