Question about frost depth.
Question about frost depth.
(OP)
Hello,
I am working on putting a new recessed loading dock between two existing buildings. The local frost depth is 4'-0" below grade. Our design called for the existing footings to be underpinned with concrete for the full width of the existing footings in order to keep the bottom of the footings 4' below the new paving. The owners rep/contractor while excavating the site encountered fairly stiff clay. He wants to do the attached while we are still maintaining that he should underpin the full width. What I am curious about is what his proposed compromise, underpinning only 6" of the footing, work. I realize that there may be failure due to part of the footing resting on hard concrete vs relatively softer clay. I am interested in your thoughts about the attached. Currently we are still maintaining the position of full width underpinning.
Thank you
I am working on putting a new recessed loading dock between two existing buildings. The local frost depth is 4'-0" below grade. Our design called for the existing footings to be underpinned with concrete for the full width of the existing footings in order to keep the bottom of the footings 4' below the new paving. The owners rep/contractor while excavating the site encountered fairly stiff clay. He wants to do the attached while we are still maintaining that he should underpin the full width. What I am curious about is what his proposed compromise, underpinning only 6" of the footing, work. I realize that there may be failure due to part of the footing resting on hard concrete vs relatively softer clay. I am interested in your thoughts about the attached. Currently we are still maintaining the position of full width underpinning.
Thank you






RE: Question about frost depth.
BA
RE: Question about frost depth.
BA
RE: Question about frost depth.
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RE: Question about frost depth.
If you're okay with the slab heaving, you could insulate under it far enough to ensure you don't get heave under the footing. Once again, you'd have to carefully consider isolation joints.
RE: Question about frost depth.
RE: Question about frost depth.