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The existing footing will be completely backfilled. This situation will prevent any lateral
failure on the three foot high footing. It is unlikely this footing would fail laterally
without backfill given its dimensions and composition.
An analysis is therefore made for crushing strength of the footing verses the unit stress of
one linear foot of the foundation wall.
A one (1) foot length by 0.67 foot thick by nine (9)high unit column of the foundation
wall weighs 905 pounds using the standard weight of concrete at 150 pounds per cubic
feet. This column will occupy an area of twelve (12) inches by eight(8) inches for a total
of ninety-six (96) square inches. This yields a stress value far less than the capacity of
the existing 3000 psi concrete.
CONCLUSION:
The existing footing system is adequate for supporting the proposed foundation wall for
the residential dwelling being constructed at this location.
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C.M.Technical Consulting,Inc. SEP I 1 j
2013 ,
118 Washington Road
Electr c f':, � �tlons Springfield,Massachusetts 01108
Phone(413)739-3658 A bervice=CoRnerte-d Disabled Veteran Owned Company
Fax(413)739-3658
September 9, 2013
Pat Melnik
110 King Street
Northampton, MA 01060
RE: 259 Chesterfield Road
Leeds, MA
Dear Mr. Melnik:
A structural engineering assessment was performed of an existing footing system at the
subject address to determine the adequacy of this system for supporting a proposed eight
(8) inch thick, nine (9) foot high foundation wall.
DESCRIPTION:
The existing footing system consists of a sixteen (16) inch wide by approximately three
(3) foot high concrete footing that is constructed of steel reinforced 3000 psi concrete.
The vertical reinforcement is #3 rebar spaced at approximately twenty-six (26) inch
intervals. The horizontal reinforcement (through the sixteen (16) inch dimension), is also
#3 rebar and is spaced at approximately twenty-four 24 inch intervals. This footing
appears to be sitting on a concrete "sub-footing"that is twenty-four (24) inches wide.
This entire footing system will be completely backed filled with soil.
FOUNDATION DESIGN:
A concrete foundation wall will be poured on this existing footing system. This wall will
be (8) inches thick and nine (9) foot high.
ANALYSIS:
The weight of a one foot unit length of the foundation wall will be 905 pounds. This
weight will be centered on the existing footing.
The existing footing will be completely backfilled. This situation will prevent any lateral
failure on the three foot high footing. It is unlikely this footing would fail laterally
without backfill given its dimensions and composition.