- Fresh snow: Roughly 1 foot of accumulated new snow weighs about 5 pounds per square foot on your roof's surface. Based on the 20 pounds-per-square-foot limit, your roof could handle up to 4 feet of new snow before being in danger.
- Old snow: Packed snow of 3 to 5 inches is equivalent to 1 foot of fresh snow, so the load limit begins at 2 feet of old snow.
- Ice: An inch of ice equals about a foot of fresh snow, according to IBHS, so 4 inches of ice on your roof could mean trouble.
The steeper the roof, the less that snow accumulates. But if a portion of your roof is flat, such as over a porch, take extra care to prevent snow and ice buildup there during a winter storm.
And for safety, just stay off that ladder. "The biggest danger is trying to go out and scrape snow off the roof yourself," says Tim Reinhold, IBHS senior vice president of research and chief engineer.
Use a snow rake, and stay safely on the ground, he advises. For multistory roofs, hire a snow-removal contractor.
Protect water pipes
If temperatures drop too low in your house during a power outage or furnace malfunction, pipes can freeze. If they burst, water leaks can cause extensive damage.
There are several ways to prevent this, according to IBHS. They include:
- Keeping the house warm using a generator or other alternative heat source, such as a wood stove.
- Insulating openings in the attic for vents, plumbing stacks, access doors, and electrical "chases" -- box-like enclosures for electrical wiring.
- Sealing doors and windows to hold in heat.
Home improvement stores sell insulation to wrap around your pipes, advises Bob Blume, a State Farm claims team manager in Colorado.
You also can use "heat tape" -- electrified wrapping -- to warm pipes. Blume advises having an electrician install it.
Prevent ice dams
Ice buildups at the roof edge or around drains keep melting snow from draining properly. This backs up, or dams, water into walls, ceilings and insulation.
Stopping ice and snow from accumulating during winter blizzards is key. Inspect your roof's drainage, keep gutters and downspouts clean, and trim trees to keep leaves to a minimum, advises IBHS.
Add insulation above the ceiling and increase roof ventilation to make the roof area warmer and prevent ice buildup.
You can even install self-regulating heat cables on gutters, downspouts and roof drains.
Use caution with alternative heat sources
Space heaters -- including electric, gas, pellet and wood stoves -- can be great alternatives to constantly running the furnace and heating the entire house. The nonelectric heaters can also be helpful if the power goes out -- taking the heat with it -- during a blizzard or other wintry natural disaster.
But take care when installing or placing heaters, and make sure they meet standards and codes. Know how to use and maintain them. Otherwise, you risk a fire.
According to the most recent estimates from the National Fire Protection Association, home fires involving heating equipment caused $893 million in direct property damage and 400 civilian deaths in 2011.
Often, these fires are caused by equipment that wasn't kept clean or was placed too close to something that could ignite.
The association offers these heater safety tips.
- Keep flammable items, such as paper or bedding, at least 3 feet away from the heater.
- Buy a heating unit approved by a recognized testing lab (such as Underwriters Laboratories).
- Install the equipment according to local codes and manufacturer's recommendations; use a licensed contractor.
- Make sure the heater vents to the outside so carbon monoxide won't build up indoors. Keep the vent clean and unclogged.
- Install carbon monoxide detectors.
- Have a qualified professional inspect and clean your heater annually -- before winter blizzards hit.