Strengthening Your Roof For The Weight Of Snow

If you have a stick frame roof there are a few basic techniques that you can use to strengthen your rafters.

Strengthening your roof for the weight of snow.

Per square foot of roof space which is beyond. Estimate the weight of snow on your roof. Use machine stress rated lumber machine stress rated msr lumber is tested by a machine so you know the exact strength of every piece used in construction. Determine the transient load of the roof.

It also helps if the roof is in a sheltered area. To find out how much snow you can expect in your region check out this link. Use this basic formula as a guide but always check with your local weather experts regarding the type of snow that typically occurs in your area. To help us get around this the iibhs provides us with its general guidelines to best assess the maximum snow weight that can be build up on the roof before it is necessary to clear it.

Strengthening existing roof rafters is a difficult process that often requires professional help. Saturated snow weighs about 20 lbs cubic foot. This is highly regional as weights of snow for example range from 10 to 300 pounds per square foot based on moisture and volume of the snow. Sheds roof strengthening kit for 6 x 5 ft 8 x 6 ft.

With the arrow roof strengthening kit you ll increase the roof strength by up to 50 which will help your shelter withstand heavy snow accumulation. The snow settles on it. Snow increases the overall weight of your roof adding to the forces acting on your rafters. In addition the closer the purlins the more evenly the snow weight will be transferred to the trusses.

3 5 inches of old snow is equal to one inch of water or about 5 lbs. Thus snow weighing 10 pounds per cubic foot and at a depth of 18 inches on a roof is exerting 15 pounds of pressure per square foot. The ideal pitched roof is smooth and steep so the snow slides off and framed with closely spaced rafters for strength. Per square foot of roof space so anything more than 2 feet of snow could be too much for your roof to handle.

S 1 25 p where s is the number of inches of snow on your roof and p is the pounds per square foot of. And 8 x 6 ft. The weight of snow on a roof varies according to its nature depending on its state fresh packed or ice the weight of the snow will not be the same on the roof. For 6 x 5 ft.

If you live in the us our snow load calculator compares the total weight on your roof with the permissible load calculated according to the standards issued by the american society of civil engineers regarding the minimum design loads for buildings and other structures asce7 16.