Installation Guide

Traditional Pergola Installation Guide
ModernPergolaKits | 3
Step 1 – Layout
A Note on Pergola Sizes
Sizes are defined by the total width
and depth of the roof. For example, a
12' x 16' pergola will have a roof area of
12' x 16' and a post spacing of 10' x 14'.
All Pergola Kits Can Be Cut To Size.
The beams and rafters supplied in the kit are
NOT pre-drilled. This is to allow the width and
depth to be customizable for each kit. Our
standard sizes are designed around a 1' overhang
on each end. This is merely a rule of thumb
and can be adjusted during installation.
Measure
a) Determine necessary height, post locations and
overhangs based upon site – Make note of the
following measurements as you will want these later:
1. Desired outside to outside dimensions of your posts
2. Desired height to the top of your beam (same
as height to bottom of your rafter)
b) Ensure posts are square with each other
and/or any adjoining structure
1. Post and beam spacing is adjustable to fit installation
site and any obstructions. Beam and rafter overhangs
should not exceed 36", purlins should not exceed 24".
2. NOTE: If adding to existing slab or patio do
not assume that they are built square!
c) It is common that existing concrete and paver
patios are installed with a certain degree of slope.
If slope is minimal (less than 1" in 10') you can
simply disregard it. If slope is more pronounced,
consider that your posts may be differing lengths
to allow pergola roof to be level to horizon.
d) Maximum span of 2x6 beams and rafters is
16'. 2x8 beams and rafters can span 22'
e) Note that purlin holders do not have to run under
any roof overhangs on your site. This allows
maximum head clearance for your rafters.
f) For challenging sites, custom fabrication of pergolas
to your unique site is available, please contact [us].
EXAMPLE:
If you have a patio that is 10'-6" deep x 13' wide you would
want a roof that was at least 12'-6" deep x 15' wide. You
would order the next size up, a 14' deep x 16' wide and
trim the beams and rafters to your desired overhang.