HOUSE FOUNDATION
CONSTRUCTION DESIGN OF A CONCRETE PILASTER
By Before The Architect Copyright 2009
YOU MAY FREELY QUOTE THE AG WITH PROPER ATTRIBUTION
Do you think that the devil's in the
house plan details? The only devil in the house plan details of whom we know is the devil
serving lazy, lousy home designers and home builders. From our vantage,
house plan details take
the wiggle-room out of commonly low home designing and home building standards. Before The
Architect
QUESTION: WHASSUP WITH HOUSE FOUNDATION
PROBLEMS?
ANSWER: PRETTY NEAR NOTHING WITH A CONCRETE COLUMN PILASTER DESIGN IN
HOUSE FOUNDATION SLAB CONSTRUCTION.
PILASTER
HOME
FOUNDATION PLAN GUIDE FOUNDATION DETAIL FOR CONCRETE COLUMN PILASTER SUPPORT TO
A FOUNDATION SLAB - FLAT SLAB, OR GRADE SLAB, OR SLAB-ON-GRADE
A house foundation concrete column pilaster
design to support a foundation slab - flat slab, or grade slab, or slab-on-grade
Shall function
to support an exterior slab on grade at its joint to a home foundation
At not less
than 6 linear inches both sides of a change in direction of the slab
At the
entirety of concentrated loads (as a step) plus 1 linear foot along
wall line each side of load
Otherwise
at not greater a clear span in feet than 3 times slab thickness in
inches
Except
where masonry finish clad flooring is to be applied, then at the
more numerous of
Not
greater than half a clear span in feet than 3 times slab
thickness in inches where masonry finish clad flooring is to be
applied
Shall function
to support evenly either side of a contraction, or control, joint
intersection with a home foundation wall
Shall function
to support each grade beam or modified grade beam butt to home
foundation
Shall be not
less
In height
than from a footing top of face to the bottom of face of the
supported element
In width
not less than 8 linear inches, not less than the width of a
supported grade beam
In depth
not less than the depth of the footing reveal on which the pilaster
rests
May be of
Brick
Block or
Placement
If of brick or
to brick, then
Secured to
a home foundation wall
With wall
ties at not greater than 6 linear inches on center on the vertical
and
With wall
ties not greater than 12 linear inches on center on the horizontal
Comment: In the figure Pilaster Home
Foundation Applications, there are two different functions served by pilasters
(dark-hatched areas) based on the footings interior top of face:
Support the
slab-on-ground either side of contraction, or control, joints (long, dashed
lines), unbonded.
Support the
slab-on-grade at either side of a cornerpoint, unbonded.
For information only -
In the illustration
Pilaster Home Foundation Applications, Plan View, the concentric semi-circles
indicate eventual finishing with decorative half-columns as apparent structure
supporting a covered porch.
Concrete Pilaster
Column
Home Foundation Design Applications, Plan View
Notes: The broad band elements with diagonal
hatches are grade beams, unbonded; the big square in an intermediate support to
the grade beams.
Center on the
vertical and not greater than 12 linear inches on center on the
horizontal
If of block or
to block
Then
secured to a home foundation wall with deformed rebar of diameter as
applied in proximity, as dowels,
At not
greater than 6 linear inches on center on the vertical and
Not
greater than 12 linear inches on center on the horizontal
Or
equivalent
Or with
wire mesh as in block wall material on not greater than 8 linear
inches centers on the vertical
If by placement
to placement either cold joint or monolithic
Then
secured to a home foundation wall with deformed rebar of diameter as
applied in proximity, as dowels,
At not
greater than 6 linear inches on center on the vertical and
Not greater
than 12 linear inches on center on the horizontal
Shall not
be secured by any means (except as by compression) to a grade
beam
A cold joint shall be
separated by a continuous bond break between the pilaster top of face
and the grade beam bottom of face
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