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I-joist
As of 2005, approximately 50% of all wood light framed
floors were framed using I-joists. An I-joist comprises two
main parts, the web and flange. The web is sandwiched
between a top and bottom flange, creating the “I” shape.
The flange can be made from laminated veneer lumber or
solid wood finger-jointed together for ultimate strength. It
is then grooved on one side to receive the web. The web is
typically made from plywood, laminated veneer lumber, or
oriented strand board. After cutting the webs and flanges
to the specified widths and lengths, they are assembled
with waterproof glue by pressuring the web into the top
and bottom flange. After initial assembly, the I-joist is then
end-trimmed and allowed to cure in an oven at room
temperature to approximately equilibrium moisture content.
The sizes manufactured vary on the I-joists intended load
and span. Their depths can range from 9 ¼ inches to 24
inches and are available up to 80 feet long. The intended
use for an I-joist is for floor joists and roof rafters in both
residential and commercial construction
I-joists were designed to help eliminate typical problems
that come with using solid lumber as joists. The advantage
of I-joists is they will not bow, crown, twist, cup, check, or
split as would a dimensional piece of lumber. Also, I-joists
are designed to help eliminate squeaky floors by being
more dimensionally sound and experience little to no
shrinking.
The I-joist made by TJ Industries, is marketed as a TJI.
As of 2005, approximately 50% of all wood light framed
floors were framed using I-joists. An I-joist comprises two
main parts, the web and flange. The web is sandwiched
between a top and bottom flange, creating the “I” shape.
The flange can be made from laminated veneer lumber or
solid wood finger-jointed together for ultimate strength. It
is then grooved on one side to receive the web. The web is
typically made from plywood, laminated veneer lumber, or
oriented strand board. After cutting the webs and flanges
to the specified widths and lengths, they are assembled
with waterproof glue by pressuring the web into the top
and bottom flange. After initial assembly, the I-joist is then
end-trimmed and allowed to cure in an oven at room
temperature to approximately equilibrium moisture content.
The sizes manufactured vary on the I-joists intended load
and span. Their depths can range from 9 ¼ inches to 24
inches and are available up to 80 feet long. The intended
use for an I-joist is for floor joists and roof rafters in both
residential and commercial construction
I-joists were designed to help eliminate typical problems
that come with using solid lumber as joists. The advantage
of I-joists is they will not bow, crown, twist, cup, check, or
split as would a dimensional piece of lumber. Also, I-joists
are designed to help eliminate squeaky floors by being
more dimensionally sound and experience little to no
shrinking.
The I-joist made by TJ Industries, is marketed as a TJI.
