Exterior glass railings offer a clean, unobstructed view, but they interact differently with the elements than metal or wood. In a climate like Ontario’s, the primary concern is not just the glass itself, but how water, ice, and snow move around the system. Proper planning prevents water from pooling in hardware channels and reduces the risk of freeze-thaw damage to mounting points.
Managing Water Flow and Drainage
Water is the most persistent challenge for exterior glazing. When rain or melting snow runs down the glass, it must have a clear path to the ground. If water collects in the top channel or around the base of the posts, it can freeze, expand, and exert pressure on the glass or the aluminum channels.
- Top Channel Slope: Ensure the top aluminum channel is slightly sloped away from the building or toward a designated drain point. Even a minor angle helps water shed off rather than sit in the channel.
- Base Drainage: The base shoe should allow water to pass through or drain away. Avoid designs that trap water between the glass and the deck surface.
- Ice Dams: In shaded areas, ice may persist longer. Designing the railing to sit slightly above the deck surface can prevent ice from forming a seal against the base, which can crack the glass upon removal.
Accounting for Snow Storage and Weight
Snow does not always slide off glass immediately. Depending on the pitch and the type of snow, it can accumulate on the top channel or the glass surface. While laminated glass is strong, the hardware and channels are not designed to support significant static loads indefinitely.
Consider the following when planning for winter conditions:
- Clearance: Ensure there is enough space between the top of the railing and any overhead structures (like a roof overhang) to prevent snow from being trapped against the glass.
- Load Distribution: If the railing is part of a larger balustrade system, ensure the posts are spaced appropriately to handle the weight of snow that might bridge between panels.
- Access for Removal: Plan for how snow will be removed. You need safe access to the top of the railing to brush off snow without damaging the glass or the finish.
Hardware Access and Seasonal Care
Exterior hardware is exposed to salt, road grime, and temperature fluctuations. Regular maintenance is essential to keep the system functioning smoothly. Choose hardware that is accessible for cleaning and inspection.
For seasonal care, focus on these tasks:
- Spring Inspection: Check for any cracks in the glass or corrosion in the hardware after the winter thaw. Ensure all bolts are tight and that the drainage paths are clear of debris.
- Winter Cleaning: Use a soft brush to remove snow and ice. Avoid metal shovels or ice picks, which can scratch the glass or damage the aluminum channels.
- Finish Protection: Wipe down aluminum channels with a mild detergent and water to remove salt residue, which can accelerate corrosion over time.
FAQs
Do I need special glass for exterior railings in cold climates?
Laminated glass is standard for safety and durability. It provides better insulation and resistance to impact. Consult with a professional to determine the best thickness and lamination for your specific project.
How do I prevent ice from forming on the glass?
While you cannot completely prevent ice, ensuring proper drainage and avoiding water pooling reduces the risk. Using a de-icing solution safe for glass and aluminum can help in extreme cases.
Can I install exterior glass railings on a wooden deck?
Yes, but the deck must be structurally sound and properly waterproofed. The railing posts must be anchored securely to the deck joists or a concrete foundation, depending on the load requirements.
Planning for drainage and snow is a critical part of designing durable glass railings for exterior use. By considering water flow, snow load, and maintenance access, you can enjoy the aesthetic benefits of glass without compromising its longevity. For a custom solution tailored to your property, request an estimate from Bonafide Glass to discuss your specific needs.