Per square foot of load.
Supporting the roof of an aluminum screenedporch for snow.
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Measure the distance between the bottom of the porch roof and the top of the ledger beams of the porch.
Decks typically are designed to support 55 pounds per square feet or psf of weight.
If the deck doubles as a porch it needs to be able to support no more than 80 psf.
If the snow on your roof is 20 inches deep then 20 x 1 25 25 lbs.
There is a fatigue factor.
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A roof may be able to support this snow load for several days or a few weeks probably no more than 30 days.
If one side of the roof is supported by the house and the other side is supported by the beam divide the total load by two as the beam is only supporting half of the roof.
If our example roof has only one beam it must carry half of the total load or 4 000 pounds.
There are two primary choices of extruded frames available for your screen wall kit.
If the roof is attached to the deck it needs to be able to support the weight.
Brings in the natural light while filtering out the hot sun.
Cut beams to fit.
Aluminum screen fabric makes a sturdy screen that withstands strong winds but it can be difficult to install and it creases easily.
While many like to use the smaller 4 x 4 posts they can tend to warp after they have been standing under the weight for several seasons.
Large 8 x 8 posts are necessary for the use of supporting a porch roof.
All framing is made from strong maintenance free aluminum.
If there is also a beam in the middle of the roof divide the total load by three.
Uncoated aluminum screen can corrode or rust in humid climates.
Patio cover kits.
These frames have a 062 thick aluminum wall making them exceptionally strong and durable when compared to products at your local hardware store.
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 that this level of loading 25 pounds per square foot is not intended to last all winter.