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Obtaining the correct Design Requirements:
Your
local
Municipal
Building
Department
can
and
will
inform
you
as
to
the
Snow
and
Wind
rating
codes
for
your
area. 
Remember
this
information
is
your
for
your
benefit.
A
local
non-direct
third
party
is
your
best
attempt
as
to
what
is
required
in
your
area, ie;
if
possible
your
local
building
dept.---you
and
your
families
safety
is
a
concern
of
ours
also.
Live Load rolls up to the next pound rating if it is in between two
ratings, example: if you have a 25 lb requirement you will need to order
a 30 lb
live load.
Open Span - No Support:
Span
in
general
is
the
unsupported
distance
between
the
structure
and
the raingutter/header
or
an
intermediate
positioned
"C"or"I" beam.An intermediate positioned "C" or "I" beam with
posts can be placed at mid-span of projection. By doing this you will
reduce the span between supports and this will allow for thinner pans to
establish your projection. This generally will require you to install
footings for the patio cover posts. Alumawood Arbor Lattice Covers
can be designed for Snow Loads of up to 60 lbs. per square foot and Wind
Factor of up to 90mph.
Snow Loads Explained:
An Arbor Lattice is an "open roof" however it can potentially snow over.
Snow weights approximately 5 - 1 / 4 pounds per cubic foot of snow
( 12" x 12" x 12" ) which is +/- = 1" in depth of water on a 12" x 12"
area. Some areas may have a slightly higher water content than 1".
The Arbor Lattice can be engineered up to a 60lb. psf snow load.
Wind Factor Explained:
We
can
engineer
up
to
90
MPH
Wind
Factor.
This
may
seem
quite
an
extreme
for
wind
but
this
is
designed
to
protect
against
the
Blustery
umbrella
effect
of
the
wind.
Note:
Exposure
"B"
has
terrain
which
has
buildings,
forest
or
surface
irregularities
covering
at
least
20
percent
of
the
ground
level
area
extending
one
mile
or
more
from
the
site.
Exposure
"C"
has
terrain
which
is
flat
and
generally
open.
Extending
one-half
mile
or
more
from
the
site,
in
any
full
quadrant.
Eave Attachments:
If you are thinking about attaching to your eave/fascia you will need to
make sure your eave/fascia can handle the load your awning will add.
The Arbor Lattice Engineering has specifications for eave attachments,
you will need to measure the size of your rafters (i.e. 2" x 4", 2" x
6", etc.) the spacing of the rafters (i.e. 16", 24", etc.) and how far
the fascia board is from the wall (eave projection). Also, you
will need to attach an A34 Clip (90 Deg. Clip) to the back side of your
fascia board and the rafter to create a mechanical connection so the
fascia does not get pulled off the rafters. If you have a closed
soffit you will have to access the bottom of your eave or attach to the
wall instead. Fascia Board must be a minimum of 2" lumber.
Roof Top Attachments:
Roof Top Ledger Engineering is available for California
applications only, if you're not in California your local Building
Inspector may accept it however contact him to verify prior to
purchasing anything. The Roof Top Engineering is an addition to
the Original ICBO Engineering Report. The Roof Top Engineering has
only been stamped for California. Attachment to the roof is done
by using 90 Degree Brackets and a 2" x 8" Douglas Fur Ledger Board.
The Brackets are Lag Bolted to the Ledger Board then Lag Bolted to the
Rafters through the Roofing of the House. The Arbor Lattice will
then attach to the ledger board by using Inside Rafter Brackets the same
as if the rafters were being attached to the wall or eave. Important Note regarding attaching an aluminum awning to a structure:
If you are thinking about attaching to a structure you will need to
make sure your structure can handle the load your awning will add.
These awnings are engineered to work with "conventional wood framed
home" on a concrete foundation. Conventional framed home can be
on a concrete slab with concrete perimeter or raised foundation with a
concrete perimeter that supports the exterior walls.
A conventional home does not include any form of
the following:
Mobile Homes
Manufactured Homes
Travel Trailers (including park models)
Reason: Mobile Homes, Manufactured Homes and Travel
Trailers are not typically designed to have any additional loads put
on their exterior walls. |
