How much snow is too much for your roof?

 

 

Every winter many roofs collapse due to heavy snow or ice loads. Add rain or heavy, wet snowfalls on top and you’ve got a dangerous combination. Often roofs collapse suddenly, giving occupants little, if any, warning to evacuate the building.

 

How Much Snow Can Your Roof Support?

 

Roof collapse can happen to new and old buildings alike and can cause extensive damage to the building and contents. Low pitched and flat roofs are most susceptible to collapses. Most roof designs can handle snow loads of 20-40 lbs per square foot. But, as the chart below shows, packed snow with ice can easily overload a roof once it reaches about 12" off depth.

 

Snow Type

Approximate Density

(lbs per square foot for every 12” of depth)

Light and Fluffy

5-20

Packed

20-40

Packed with Ice

40-58

Ice

58

 

 

 

 

 

How To Protect Your Roof

 

Watch for ice build up on the edge and valleys of your roof. When heat escapes through your attic, it melts the snow. When this water freezes at the edge of your roof, it forms an ice dam and allows water to back up and enter the building under the shingles and wood decking. Besides adding extra weight to your roof, ice dams can cause extensive water damage inside.

 

Excessive accumulations of snow and ice will require removal. For safe removal that won't endanger you or damage your roof, consult a roofing contractor. Be certain the contractor is covered by WSIB (Workers Compensation) and provides you with a current liability insurance certificate.

 

 

 

Clearing Snow From Your Roof

 

If you are removing the snow on your own, be very careful as the roof can be very slippery. Here are a couple of tips to follow if you choose to tackle this job yourself:

 

1. Wear Safe Attire

 

Choose a pair of boots with excellent traction.

 

2. Choose a Proper Shovel

 

A plastic bucket (scoop) shovel with a large handle is best so you can scoop and slid the snow off the roof’s edge.

 

3. Save Your Shingles

 

Don’t pick or chip at ice near the roof surface or dig deep as you may damage the shingles and shorten the roof’s life expectancy.

 

4. Minimize The Stress

 

Do not pile all the snow in one area before removing it. This may overstress that section of the roof causing it to collapse.

 

5. Be Safe, Not Sorry

 

Removing snow from your roof is not a job to rush.

 

Protect your home and your family this winter by keeping your roof clear from snow build-up. Use the chart above to estimate when the snow needs to be cleared and then be careful to get the job done safely and properly.

 

 

 

     

 

 

 

Susan E. Lemay

Susan E. Lemay

Sales Representative
CENTURY 21 Reynard Real Estate Ltd., Brokerage*
Contact Me

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