Box Columns Specs
We have had inquiries about our Box Columns.
Above are some photos that may help clarify what they are, and the
following is a description of the components and construction method. The
finished columns are 9 1/2 feet tall, 6 3/4 inches thick and 18 inches
wide. The height accommodates seven rows of two string bales.
Vertical struts 3 - 2"x6"x10' - cut to 9 feet, 3 inches.
Top plate, bottom plate, fire-break 1- 2"x6"x10" - cut two 18 inch pieces
(top and bottom plates) and one 15 inch piece (center fire-break).
Sheathing Two sheets of 4'x8'x5/8" OSB - rip 18 inch wide strips from
sheet. Insulation 6'x18" open faced fiberglass.
Nail two of the 2"x6" timbers together with 16D framing nails, spaced
about 6 inches apart and staggered edge to edge. This yields a nominal
4"x6". Lay the 4"x6" and the other 2"x6" on edge appx. 18 inches apart and
nail on the top and bottom plates. Square the resulting box with a framing
square and nail in the 15 inch fire-break at the mid-point (16D framing
At this point we sheathed one side. Two pieces of sheathing are required
for columns this tall. One 5/8" x 18" x 8' and one 5/8" x 18" x 18" OSB.
Apply construction adhesive to one side of the box frame. Lay on the
sheathing pieces and fasten with 8D nails every four to six inches around
the perimeter and across the fire-break.
At this stage the columns were installed on the foundation. (doubled 2" x
6" facing to the outside of building - this thickness carries the load of
the 2"x12" microlam perimeter joist) by drilling two half inch holes in
the bottom plate that would accommodate two 1/2" x 6" J-bolts embedded in
After this step the columns were stuffed with insulation and the other
side of the sheathing was glued and nailed into place. This describes one
box column and there seems to be a lot of waste material but when many are
being constructed there isn't much waste. The box columns are attached to
the perimeter joist with steel column caps from Simpson Connectors. The
stirrups on the column caps had to be welded (by Simpson) at 6 3/4" wide
to accommodate the width of the columns.
Box Column Details
We have had many
people ask about the details of the box columns. Click
here for details on how they
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left lists the components of the houses as they are being
built. If you start with Foundations and click on each
button under it, you will see the houses going up in
sequence from start to current status.
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