Residential building Footing and foundation wall
Residential building Footing and foundation wall
(OP)
I need help to resolve a Construction site issue: Upon soil excavation for a new 2 stories high residential building, the foundation wall at the cellar of the adjacent existing one Storey has a "T" shaped footing instead of an 'L" shaped footing. The "T" shaped foot encroached 4-5" beyond the property line of the new building. The cellar level of the new building would be about 1' lower than the adjacent existing footing. I would appreciate a recommendation on how to resolve the detail for the new footing and foundation wall.
RE: Residential building Footing and foundation wall
RE: Residential building Footing and foundation wall
RE: Residential building Footing and foundation wall
I need help to resolve an EXISTING Construction site issue:
A.. Upon soil excavation for a new 2 stories high residential building, we found out that an ADJACENT EXISTING 1 STOREY WITH CELLAR BRICK BLDG HAS THE FOOTING (T Shaped)4" OVER THE PROPERTY LINE INTO MY SITE.
B.. My proposed New 2-Storey Building with Cellar has an 'L" Shaped Footing which is supposed to be installed at the LOT LINE. My Cellar Level is 12 INCHES LOWER than the Cellar of the adjacent existing building.
C.. I would appreciate a recommendation on how to resolve the DETAIL FOR THE NEW BLDG FOOTING AND FOUNDATION WALL. PS, I CANNOT MOVE THE NEW BLDG FOOTING AT ALL. IT MUST BE BUILT AT THE LOT LINE (0' Lot Line)
RE: Residential building Footing and foundation wall
Calculate the effect of the eccentricity.
It is a lot of work but unless your design is very thin it should work out.
And I presume that the owner of your site is going after the neighbor for all additional costs.
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P.E. Metallurgy, consulting work welcomed
RE: Residential building Footing and foundation wall
These are the options as I see them:
1) Move your footing and foundation wall over and cantilever the wall above to hit the lot line. You'll lose a bit of basement square footage but you'll keep the building above the original dimensions.
2) The developer of your building convinces the owner of that building that's okay to do an analysis of his building to see if it's okay to cut 5" off of the existing footing so you can build yours up to the lot line. Good luck.
3) Come up with some weird combined footing that picks up the 5" of their footing overhanging the property line. I've never been a position to do a 0 setback foundation so I don't know if that's common...but on its face it seems like a horrible idea and I wouldn't recommend it.
RE: Residential building Footing and foundation wall
RE: Residential building Footing and foundation wall
RE: Residential building Footing and foundation wall
Assuming the new footing is deeper and assuming reasonably average soils, no rock, and no ground water problem; underpin the existing building (with permission). Keep the front face of the underpinning even with the property line. Rear face of the underpinning should be even with the rear edge of the existing footing. Extend the underpinning straight down to at least 6 inches deeper than bottom of the proposed footing and then continue the underpinning for an additional 4 to 6 inches of depth while belling out the front face of the underpinning 4 inches beyond the property line to provide bottom bearing for the underpinning that is equal to the original footing. Trim off the front 4 inches of the existing footing that extends across the property line AFTER the underpinning is finished. Make sure the new footing is founded on well-compacted soil above the belled portion of the underpinning. No reinforcing steel is needed for the underpinning. Dry pack an approximate 2.5 to 3 inch gap between the existing footing and the top of the underpinning. If none of this makes any sense to you, call a contractor who is experienced in underpinning or call me with questions.
www.PeirceEngineering.com
RE: Residential building Footing and foundation wall
I'll move my footing and Foundation wall 1 foot from the Lot Line and cantilever 5" back on the first floor to meet the Lot Line. I would provide reinforced conc. piers or columns at min 6' OC and brace/tie with 4' steel beam to the columns (enough to withstand/pick up the conc. blocks wall weight and the bending moment).
RE: Residential building Footing and foundation wall
www.PeirceEngineering.com