Modern Pergola
Installation Guide
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9
STEP 6 – INSTALL RAFTERS
a)
Measure from the outside of
one box beam to the other.
This measurement will be
divided evenly depending
on the number of rafters in
your kit. Example (Figure 6):
If you have a 16’ wide kit you
will have six rafters and seven
spaces. The measurement
from the outside of your box
beams should be around 191".
Subtracting 2" will give us the
center to center measurement.
191"-2" =189". We will then
divide 189" by seven spaces to
get 27". This is the center to
center measurement of each
rafter. If you have NOT trimmed
your pergola width this center
to center measurement will
be called out in the CAD
drawing for each pergola size.
b)
Using this measurement,
mark the center of each rafter
on each of the beams.
c)
Using the fasteners marked
"rafter hanger to beam", and
the rafter hanger tool included
with your kit, install the rafter
hangers on these marked
locations. The rafter hanger
tool will ensure the proper
height of each rafter on the
beam. If your kit is attaching
to a structure, please note
that these fasteners are NOT
provided in your kit as they
are determined by the type of
structure you are attaching to.
d)
If your kit is attached to a
structure, you will want to
transfer the same rafter
spacing layout you used on
your outside box beam to the
ledger plate on the structure.
To ensure the rafter hangers
are placed at the correct height
it is helpful to use a stringline
attached with quick clamps
to the box beams next to the
structure. If you pull this line
tight under the box beams it will
show the correct line for the
bottom of your rafter hangers.
e)
If you trimmed the depth of
your pergola please follow
items 1-2 below, If not
proceed to letter e) below.
1.
Measure each opening
between hangers to
determine the rafter
length. Write this on the
top of each rafter.
2.
Cut each rafter ½" shorter
than this measurement.
f)
Using a helper, lift and set each
rafter into place, and attach
with the fasteners labeled
"rafter hanger to rafter".
g)
Repeat this step for each
rafter and connection
R
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Purlin Direction
Measure Outside to Outside at Post Base
Install rafter hangers in even increments
Figure 6
