From 
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FIGURE A Trellis/arbor details.
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1. Stake the post positions using a
rectangular 2x4
template. Remove the template and dig the postholes.
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2. Screw the lower post assemblies
together with
four pairs of screws on each side.
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3. Drop the posts into their
postholes, then plumb
them both ways and toe-screw them to the template.
Tamp soil around it to brace it.
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4. Mark the short side posts a few
inches above grade
and cut them off with a circular saw. Take care not
to cut the long center post.
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5. Cut the lintels to length, then level and rest them on temporary blocks. Mark the height of the center 2x4s, then cut them off with your circular saw.
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6. Cut the cedar 2x4 post trim
boards to length and
screw them to the center treated post. Then screw
the lintels in place flush with the post top.
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7. Cut the 2x6 post trim to fit
directly under the lintel
and screw it to the cedar 2x4s, keeping an even
overhang on both sides.
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8. Set the trellis posts, then cut
the
2x4 rungs to fit between them.
cluster the rungs and lay out the
picket positions.
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9. Stack the rungs over the
vertical supports, screwing
each one to the tops below it as you work.
You’ll cover the joints with 2x6s later.
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10. Tack a level guide board across
the posts. Push
the pickets against the guide and nail them to
each rung with 10d finish nails. Add the last 2x6 trim
boards.
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