Snow guards work by creating friction and interrupting the movement of snow across the roof’s surface. When snow accumulates on a roof, it forms a layer that can become slippery when warmed by sunlight or attic heat. This slippery layer can allow the snow to slide off the roof all at once, posing a significant risk to people and property below. Snow guards, by breaking up the large mass of snow into smaller sections, prevent the dangerous release of snow in one abrupt motion.
Types of Snow Guards:
1. Fence-style snow guards: These snow guards consist of a series of metal bars or rods that are installed parallel to the roof’s eaves. They prevent large quantities of snow from sliding off by creating barriers that hold the snow in place, allowing it to gradually melt or get removed in a controlled manner.
- Pad-style snow guards: Pad-style snow guards feature a flat or slightly sloped plate that is attached to the roof. The pads create friction and surface tension, preventing the snow from easily sliding off. They often have raised nubs or ribs to enhance their grip on the snow.
- Pipe-style snow guards: Pipe-style snow guards are cylindrical tubes that are attached to the roof. They work by creating multiple small points of contact with the snow, increasing friction and stability. This design allows for easy installation and removal if needed.
Effectiveness in Preventing Roof Collapse:
The use of snow guards can be effective in preventing roof collapse under certain conditions. They help distribute the weight of accumulated snow more evenly across the roof’s surface, reducing the risk of localized stress points that could lead to structural failure.
However, it is important to note that snow guards alone may not guarantee complete prevention of roof collapse. Their effectiveness also depends on factors such as the roof’s design and construction, the amount and type of snowfall, and the condition of the roof itself.
Consulting a Structural Engineer:
To determine the suitability and necessary installation of snow guards for a particular roof, it is advisable to consult with a professional structural engineer with expertise in snow load analysis. The engineer can assess the specific requirements based on regional climate data, roof pitch, and other relevant factors to ensure proper snow guard installation.
While snow guards can help reduce the risk of roof collapse due to snow build-up, they are not foolproof solutions. Homeowners in heavy snowfall areas should consult with professionals to evaluate the effectiveness and necessity of installing snow guards on their roofs. Understanding the types of snow guards available and their mechanisms of action can be beneficial in making informed decisions to protect their roofs and the safety of occupants in snow-laden winters.