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DECK
MOUNT SNOW FENCE TECHNICAL GUIDE
TRA-Mage's
Deck Mount Fences have been designed for use as a surface
mounted snow fence for all pitched roofs, installed over
ice and water protector membrane and sheathing, the lag
bolts go through the sheathing into the rafters.
For optimum assurance that your rafters can support the
snow load, check with a structural engineer. You will need
to know the snow load, roof slope and snow fence location.
The general rule of the deck mount placement is to install
one row of snow fences at the eave over the plate line,
adding additional rows up the roof every 15' when the eave
to ridge length runs over 20'. An engineer should be consulted
to determine that each snow fence will hold specific load.
For assurance that the lag bolts will not pull out due to
snow and ice loads, check with the structural engineer or
lag bolt manufacturer for load pull-out numbers on the lag
size and length. The fail point on these snow fences is
the lag screws and their pull-out poundage. Be sure that
there are enough snow fences up the roof to carry the weight
of the snow without pulling out the lag screws. Spacing
brackets over 24" on center can cause the pipe to bend.
Note: The snow load is based upon the ground snow load,
roof slope and the number of square feet of snow load that
will be on a given bracket. Check with your local building
department to verify the snow loads for your area.
It should be noted that snow fences are designed to stop
upper-layered snow and ice from sliding off a roof. Snow
brackets should be used to stop other snow and ice movement
on roofs. Note: Snow fences do not stop ice dams from occurring.
Please refer to the NTRMA and WSRCA manual for proper roofing
application in heavy snow areas.
INSTALLATION
Install the snow fence over the roof plate line. The snow
fence must be secured to the rafter. The hole size for the
lag bolt is 1/2". So you will need to use a 3/8"
bolt. TRA-Mage recommends caulking with butyl around the
snow fence base in the lag holes. To keep the snow fences
lines up with the holes for the pipes, run one pipe through
the previous bracket installed to the new one. Snow fence
brackets should be installed from 16" to 24" on
centers. Slide pipes through the holes in the snow fence
brackets. The pipes are 10' long and are threaded on each
end. Connect the pipes at the coupling. Install additional
rows of snow fence up the roof as needed.
PACKAGING
TRA-Mage Snow Fence brackets are normally shipped 30 to
a pallet. Snow Fence pipe are normally shipped in bundles
of 5-10 pipes.
TYPES
TRA-Mage Snow Fences are available pained in most powder
coat colors.
Call
for more details!
(800)
606-8980
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