All of our units are
supplied as pre-engineered roofing systems
which have been approved by qualified, state
approved engineers in 45 States. Our systems
are rated according to 2012 International
Building Codes. We can supply you with the
engineering on our components upon request.
Our engineering does not account for snow
drifting or wind uplift in wall attached
units. If for any reason local
specifications require an individually
engineered unit, it can be supplied at an
additional cost. Current approved standards
assume an importance factor equal to 1 &
wind exposure equal to "B".
will need to know your local (city /
municipal building department) live load
requirements (lb./sq.ft.) and wind speed
Your city building
department is where building permits are
issued from. You may or may not need an
actual permit for your installation, and
this is left as the sole responsibility of
the homeowner. However, panel thickness,
beam placements, beam size, distance between
posts out front... all are a function of the
load (snow & wind) that your cover will be
subject to. Even though you may determine
that you do not require a permit, you will
still need to contact them to get your local
building code requirements so that we can
supply you with the 'correct' materials!
Customers agree to hold Home Porch & Patio
Kits Inc. and the manufacturer free of any
liability for improper installation,
maintenance and repair.
When building something like your home are
attaching a structure to it, they need to
built strong, secure and wind resistant.
Wind load calculations are important to
ensure that the structure can withstand the
kind of winds common to your area. Wind load
calculations can be difficult to figure out
because the wind is unpredictable, however
the IBC standards can give you a good idea
of what a building can withstand. Wind
loading analysis is an essential part of the
Roof snow loads are influenced by elevation
of the area you live in, wind, general
weather patterns and moisture laden air,
roof configuration and slope. We always ask
you to call your local building department
to get the wind and snow load requirements
for your area because overestimation of load
requirements unnecessarily increases the cost of
construction and underestimation of load
requirements creates the potential for unit
failure and safety issues.
Roof snow and wind loads are based on the
historical records for a given location,
however the local building authority should
always be consulted to determine the correct
roof snow and wind load to use for a given
site and application.
The weight of snow varies greatly. Light
fluffY snow may only weigh about seven
pounds per cubic foot. More average snow may
weigh 15 pounds per cubic foot and drifted
compacted snow may weigh 20 pounds or more.
The following calculation is based on a 25%
moisture density which is conservative. As a
rule, saturated snow weighs about 20 lbs.
per cubic foot. The moisture content of snow
can range from 1% to 33%, which relates to
weights of 1 pound to over 30 pounds per
Sample calculation: There are 7.48 gallons
per cubic foot of water- that's about 62.4
For Wet Snow
- Let's say wet snow would be equivalent
to 1" of rain or 5" of snow, you would
get a resulting 62.4/5 = 12.5 lbs./cu.ft.
Fluffy Snow - Let's say fluffy snow
would be equivalent to 2.5" of water and
12" snow, you would get 62.4/12= 5.2
The following table describes how far each panel thickness can go away
from the wall until it needs to be supported by a set of beam & posts!
Note: 3" Roof thickness simply references the thickness of the panel
How to read the table: For example... a 3" thick roof
panel will span 12' away from the wall under a 25 lb. load requirement
Maximum Panel Simple Span Load Table
| Rated for 115 mph (or less) wind loading
3" Thick | .024" Skin
4" Thick | .024" Skin
6" Thick | .024" Skin
The following table(s) describe the
load vs span capabilities of our flat pan and W pan
Note: .023 ga.
= .023" thick / This simply references the thickness of
How to read the table:
For example in the table below...
8'6" is how far you can go 'away from the wall' before the .023" thick pan needs to be supported under a 20lb. load requirement
12" x 3" Flat Roof Panel - Maximum Panel Simple Span
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