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The homeowner Frank does a
final walk of the front of his Altadena home. The foundation is unreinforced
brick. He has elected to install a steel reinforced "sister foundation" on
the interior face of the existing masonry foundation. Thereby preserving the
architectural integrity of this classic craftsman home.
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Our crew has arrived at the
jobsite and is busy under the house trenching for a new foundation to secure
the structure against the lateral forces generated by some earthquakes. |
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The trenching along the interior of the south elevation
is nearly ready for the steel reinforcing grid.
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We have carved niches at 48"
on center in the existing brick and hung a foundation bolt, which will be
cast in the new concrete.
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Additional niches and bolts are placed within twelve inches of each corner
of the foundation
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The steel reinforcing grid is
hung in place in readiness for the forming boards. |
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The steel is bent into the
new footing base and tied to two continuous bars of steel that run the
length of the entire new footing.
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Forming boards are being
placed to contain the pouring of new wet concrete until the concrete
properly sets up
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As with a majority of homes
of this era, there was no foundation under the wall of the front door where
the porch joins the house, a condition that allows that portion of the
structure to be the first section to slide and suffer some degree or total
collapse. Above is a new trenching and form under that vulnerable portion.
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The trenching, and steel
placement has been approved by the local jurisdiction. The foreman begins
placing pumped concrete for the new foundation system.
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You can almost hear him shout
commands to start or stop the pump until he has repositioned the hose for
concrete placement.
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Easy to imagine the surging
force of the wet concrete as it pumps out of the nozzle. Several crew
members back him up holding the hose steady. |
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The new concrete wall under
the front elevation, along with the rest of the foundation has been stripped
of the forms and anchored in place.
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Plywood shear panels are
being gun-nailed to strict specifications. The holes in the plywood must be
strategically placed to allow ventilation of the stud bays, and serve as
inspection windows to verify steel foundation anchorage.
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The foreman tests the torque
values applied to the nuts and washers.
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Mesh is fastened in place
over the ventilation and inspection holes to prevent pest infestation. |
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Our proud foreman stands
along with Frank, his wife, and sweet daughter. The family can now rest
easily as this fine home is now braced against future earthquakes. |
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We are now ready to leave
these delighted customers for the next project. Could it be yours? |