When should you remove snow from your roof?

How much snow is dangerous for a roof?

There is no universal amount of snow considered dangerous for a roof. In Quebec, roofs are designed according to the requirements of the Quebec Construction Code, which specifies the roof snow load a structure must support. This capacity varies depending on:

• The type of roofing materials and the age of the home
• The size of the roof
• Its slope (sloped roof or flat roof)
• The region (weather conditions vary across Quebec)

In practice, a “normal” snow accumulation is generally supported by both flat and sloped roofs. However, roof snow removal is recommended in certain situations, including:

• When snow blocks essential elements such as roof vents or plumbing vents
• When rain is forecast over a thick layer of accumulated snow

How do you know if there is too much snow on your roof?

Certain warning signs may appear inside your home before a roof collapses under excessive snow load. Watch for:

• Unusual cracking or popping sounds in the frame or ceiling
• Doors or windows that suddenly stick, possibly indicating structural deformation
• A sagging ceiling or visibly bowed roof
• New cracks in drywall on walls or ceilings
• Water infiltration or visible moisture stains indoors

If you notice one or more of these symptoms, removing snow from your roof may become an essential preventive measure to avoid major structural damage or even a roof collapse.

A prompt intervention can prevent significant damage to your home.

Tips for safe roof snow removal

After fresh snowfall or strong winds that cause uneven snow accumulation, exercise caution.

• Work from the ground using a roof snow rake made of wood or plastic with a telescopic handle.
• Ensure you have proper roof safety equipment, such as a safety harness and a securely anchored ladder.
• Always have someone assist you during the operation.

Good to know: Proper attic ventilation and adequate insulation help prevent ice dam formation and reduce the risk of ice buildup.

Should you remove snow from solar panels and skylights?

Yes.

Solar panels

It is recommended to perform solar panel snow removal during heavy accumulation. From the ground, use a soft, non-abrasive telescopic brush to avoid damaging the surface.

The amount of snow retained depends on the panel angle. A thin layer of snow will usually melt on its own.

Skylights

It is recommended to carry out skylight snow removal in winter. Excess accumulation can put pressure on the glass or frame. Melting snow may infiltrate around the skylight and cause water damage.

Do you need to remove snow from a metal roof?

No. Snow typically does not remain on a metal roof. Materials such as steel or aluminum are smooth and prevent snow from adhering.

Devices such as snow guards or snow stops are installed to prevent snow or ice from sliding off suddenly and posing a risk to people below.

When should you hire professionals for roof snow removal?

It is best to hire professionals if your roof is:

• High
• Flat
• Difficult to access

A specialized roofer has the experience and equipment required for safe snow removal. Snow removal companies, landscaping businesses, or building maintenance providers may also offer this service.

Good to know: If your roofing system is still under warranty, contact the contractor who issued it before performing any work.

Do you need to remove all the snow from your roof?

Not necessarily. It depends on your roof type:

• Flat roof: Clear the drain and create drainage channels
• Sloped roof: Clear snow from the edge of the roof to improve water drainage at the bottom of the slope.

In all cases, leave the bottom layer of snow in place to avoid damaging the waterproof membrane. This is particularly important for asphalt shingle roofs.

Roof vents and plumbing vents should also be cleared. Also check that water is draining properly from the gutters, especially during periods of freezing and thawing, to prevent ice or blockages from forming.

Snow damage: Are you covered by home insurance?

Even with proper precautions, snow and ice can damage your home or belongings. Depending on the type of loss, two coverages are particularly important:

1. Water infiltration

Snowmelt or ice blocking drainage can cause water infiltration. Verify that your policy includes a water damage endorsement (above-ground water), which covers this type of loss.

2. Damage caused by the weight of snow

Exceptional snow accumulation can weaken your roofing system and personal property. An all-risk home insurance policy typically covers damage caused by the weight of snow and ice.