| Build the Bridge |
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These
instructions are intended solely for a decorative bridge which rests
entirely on the ground. To cross an actual gap (ditch, pond, etc.)
consult your local building authorities for specific instructions
and requirements. |
Use the following steps to construct a 16' x 3' bridge. You may, of course, change any dimensions
you wish. Just remember to scale up or down accordingly. If you decide
to make the bridge wider, don't allow the stringers to be more than 24"
on
center (OC).
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| Lay Out and Cut the Stringers |
- Use 16' 2x12s for the stringers. Square both
ends
of a 2x12 and cut it exactly 16' in length.
- Measure up 4" on each end of the 2x12 and make a mark. Locate the center
of the 2x12, measure 1 1/2' (18") toward the left and right ends, and
mark. Draw cut-lines between the marks as shown below.
- Use a circular saw to cut the stringer along the cut-line. Use the first stringer as a pattern to mark and cut the
other stringers.
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| Brace the Stringers |
- Cut ten 14 3/4" pieces from your 2x4 stock. Use the pieces of 2x4 to brace
the stringers. Install the center and intermediate braces staggered, as shown below.
- Install the end braces flush with the bottom of the stringers, the intermediate
braces 1" up from the bottom of the stringers and the center braces
flush with the top of the stringers.
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| Install the Decking |
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Good idea:
To avoid splitting the deck boards, predrill holes for the screws.
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- Cut 5/4x6 decking boards to 36" for decking.
- Center the decking boards on the stringer frame so there's about an inch of
overhang on each side. Secure the deck boards with two screws at each
stringer. Leave a 1/8" to 1/4" gap between each decking board.
It may be necessary to cut decking boards to fit where the incline flattens
out on the bridge. Stain
and seal the bridge.
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| Railings |
For this
bridge, we decided not to install railings. In most areas, structures
under two feet high are not required to have railings, but always check
with your local building inspector for requirements in your area. If your
local code requires railings or if you would like to add them to your
bridge, please see the railing instructions in our deck
building article.
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