Managing Snow Load and Structural Integrity
Every veranda installed in the UK is engineered to a specific snow load based on its location and altitude. However, an exceptionally heavy winter can still cause concern for homeowners. Understanding how your roof is designed to 'deflect' (bend slightly) under weight, and knowing the safe way to clear snow if necessary, will ensure your structure remains in perfect condition for decades.
The physics of structural deflection
All structural beams are designed to flex slightly under load. This deflection is a sign that the material is working to distribute the weight of the snow. Calculations ensure that this flex remains well within the 'elastic limit' of the aluminium, meaning it will return to its perfectly flat position once the snow melts.
- Engineered flex limits
- Recovery to original form
- Safety factors built into calculations
When should you clear snow?
In most cases, you should let snow melt naturally. Modern roofs are designed to handle significant weight. However, if a very heavy 'dump' of wet, heavy snow occurs, or if 'drifting' piles snow higher in one corner, you might choose to clear some of it to reduce the immediate pressure on the frame.
Never clear snow by climbing onto the roof; always work from the ground or a secure ladder using long-reach tools.
Safe clearing techniques
If you must clear the roof, use a soft-bristled brush on a telescopic pole. Avoid using metal shovels or sharp implements that could scratch the glass or damage the powder-coated finish of the glazing bars. Starting from the edges and working inwards helps prevent unbalancing the load.
- 1Use soft-bristled telescopic brushes
- 2Clear gutters first to allow melt-water to escape
- 3Avoid pouring hot water on cold glass
Common questions
Is it normal for the roof to creak in the snow?
Yes, small sounds are common as the aluminium and glass expand and contract at different rates under the weight and temperature change.
Can I use salt or de-icer on the roof?
No, salt and chemicals can damage the aluminium's powder-coating and the rubber seals; use only plain water or a soft brush.
How much snow can a glass roof actually hold?
This is calculated per project, but a typical roof is designed to handle at least 60-100kg per square metre depending on your local postcode.
Do solid roofs handle snow better than glass?
Both are engineered to the same safety standards, though snow may slide off glass more easily than off some solid panel finishes.
Impact of 'drifting' snow
Drifting occurs when wind blows snow off a higher house roof onto the lower veranda roof. This can create a localized weight that exceeds the average snowfall. If your property is prone to this, our surveyors will often specify reinforced rafters in the affected areas.
Check your house roof for snow guards which can prevent large 'avalanches' onto your veranda.
In short
Veranda roofs are engineered for structural deflection under snow load, and while they rarely need manual clearing, using soft tools from ground level is the only safe way to do so.
What to do next
Talk to our engineers about the snow-load specifications for your specific location.
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