What Does it Mean to “Test From the Sheathing Up”?
TRA Snow and Sun is serious about providing a snow retention system that is the most protective and dependable of any on the market. From the moment the patent was received on the very first Snow Bracket, founder Terry Anderson’s number one goal has been to protect people from the dangers of avalanching snow and ice. Hundreds of people around the world have become victims of this highly preventable hazard; and hundreds of thousands of dollars have been spent repairing damaged property and resolving lawsuits. Our goal has never changed. Protecting and saving human lives is the most important thing we do.
If you’re one of those visual people who’s getting tired of reading (like me!),
scroll down a little further to see an actual test of one of our Snow Brackets.
Our warranties on roof snow retention products are some of the best in the industry because we test not just our own product but also the method of attachment. We recommend that you look into our competition and you’ll find that many guarantee only their product. You’ll find we stand behind our systems better than the rest.
What types of tests are run?
- On sloped roofs with shingles or tile, we perform a type of tension test which determines at what force the snow guards fail due to shear causing bending/deformation or fastener pull-out. Materials tested include various sheathing types and thickness, different snow bracket types and materials, and fasteners of many types and lengths. We do our best to test the actual field conditions. A failure is when ANY PART of the system deforms, breaks, bends or tears off, not just when the snow guard pulls off.
- On standing seam metal panel roofs we determine at what point a clamp fails by sliding down the seam or twisting off the seam. Failure occurs with damage to any part of the system not just the clamp.
- We create spreadsheets with adequate safety factors plugged in to assist in determining the proper layout/installation to prevent failure on actual roofs. The bracket metal type, roof sheathing type and thickness, attachment method, type of roofing product, snow load and other factors that determine proper design and layout.
- The customer provides the data for their particular, unique roof and a layout is designed. (It must be noted that we are not responsible for inaccurate data provided by the customer.)
Here is an example of a tension test on a copper H Snow Bracket, using stainless steel screws into 7/16″ OSB sheathing. Similar tests are done in numerous other combinations of snow guard, attachments and sheathings. This information is tabulated and used to provide excellent engineered systems to our end customers. It is our hope that our products and engineering methods will protect property and save lives.