Snow Load Dangers on Low-Slope Roofs in Central New York: What Builders Need to Know

Especially for Post Frame Structures in Onondaga & Cortland Counties

In Central New York, snow is more than a seasonal inconvenience. It can be a structural hazard, especially for low-slope roofs on post frame buildings. Builders working in Onondaga, Cortland, and Cayuga Counties understand that snow load is a critical factor in both new construction and repairs, particularly for buildings built decades ago. Understanding how snow load affects structural integrity and how thaw and re-freeze cycles worsen the problem is therefore critical for both builders as well as property owners.

What Is Snow Load and Why Does It Matter?

Snow load is the downward force snow exerts on a roof. In regions like Central New York, snow is often heavy and wet, sometimes weighing 20 pounds per cubic foot or more. For low-slope roofs, which are often common in agricultural buildings, pole barns, and many agricultural and commercial structures, snow doesn’t easily slide off. This allows snow to accumulate rapidly and remain in place longer.

According to ASCE 7-22 design standards, the ground snow load in Onondaga, Cortland, and Cayuga Counties typically ranges from 50 to 70 psf (pounds per square foot). Builders must ensure roofs are engineered to withstand these loads—not just when snow is fresh, but during repeated freeze-thaw cycles that can compact snow and increase density.

The Risk of Thaw and Re-Freeze

In post frame buildings over 20 years old, roofing materials and structural connectors may already be fatigued. Add the effects of Central New York’s volatile winter temperatures where melting during the day is followed by overnight freezing and problems quite literally compound. Ice dams can form at eaves, snow can become denser and heavier, and water intrusion can begin where seals have aged or failed.

These cycles often go unnoticed until significant damage occurs, such as:

• Roof sagging or deflection in trusses
• Cracks in metal or wood paneling
• Fastener pull-out or sheared connections
• Drainage backup and water damage inside

Local Expertise You Can Trust

Tully Building Supply in Tully, NY has been a trusted name in Central New York for decades, providing quality materials and expert advice for builders specializing in post frame construction. Whether you are building new in Cortland County or restoring a 50-year-old pole barn in Moravia, our team can help you choose roofing systems and materials rated for local snow loads and winter extremes.

Don’t Let Snow Load Catch You Off Guard

For builders across Central New York, snow load planning isn’t optional. It’s mandatory. Design for today’s conditions. Inspect older roofs for signs of stress. And rely on local experts like Tully Building Supply to help ensure your post frame and other structures are safe, durable, and ready for whatever a Central New York winter brings.