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Modern Pergola Installation Guide
STEP 5 – INSTALL PERIMETER BOX BEAMS
(ATTACHED TO STRUCTURE METHOD)
a)
If you trimmed the width
or depth of your pergola
follow items 1-4 below. If not
proceed to letter b) below.
1.
Start by measuring, at the
post base, the outside to
outside of the posts as
shown in figure 5c. Write
this measurement on
top of the corresponding
box beam (2x8).
2.
Cut this beam ½" under
the outside to outside
post measurement.
3.
Measure the outside of
post to ledger plate (already
attached to structure) for
the remaining two openings.
Write this measurement on
the top of each box beam.
4.
Cut these beams 2 ½"
under this measurement.
b)
Using the step bit, drill two
large holes in the top of each
beam end according to figure
5b. These holes will be covered
later. DO NOT drill holes on
the side of the beam that
attaches to the structure.
c)
Install the rafter hanger on
the ledger plate for each of
the box beams attaching
to your structure.
NOTE:
Necessary fasteners for ledger
plate attachment are NOT
provided in kit. Requirements
determined by structure.
d)
Using a helper, lift and set
the beams into your posts
and hangers ensuring to lap
the beams as per figure 5c.
e)
Using your driver extension
fasten the beam to the
Post Top Plate using the
fasteners provided.
f)
Set the beam attachment
bracket in the inside
corner of each beam
intersection (Figure 5b).
g)
Using a driver extension and
the pre-drilled holes in the
post, attach each bracket
to box beam with fasteners
labeled "beam attachment
bracket" You DO NOT need to
fill every hole on the bracket,
four per side is sufficient.
h)
Insert the post cap into each
post. This cap should sit ¼"
below the top edge of the post.
i)
Fasten the post cap to the
top of the box beams with
fasteners labeled "post cap."
j)
Install 5/8" plugs into the holes
on the side of the post.
k)
Fasten outside beams to rafter
hanger using fasteners labeled
"rafter hanger to rafter." DO
NOT put a screw in the top
hole on the inside of the box
beam as it will interfere with the
outside purlin holder in step 7.
l)
Repeat this step for each
beam and post connection.
Ledger Plate
Structure
7" sq. Post
2"x8" Box Beam
2
"x8
" B
ox
B
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m
2
"x8
" B
ox
B
ea
m
M
ea
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f P
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Measure Outside to Outside at Post Base
Figure 5c
