Why Does Your Roof Leak When It Snows? (How to Prevent It)

Winter brings beautiful snowfall, but it can also bring an unwelcome surprise—roof leaks. Many homeowners assume their roofs are safe from leaks in cold weather, but snow and ice can cause serious issues. Understanding why your roof leaks when it snows and how to prevent it can save you from costly repairs.

In this guide, we’ll cover:

• Common reasons roofs leak during snowstorms
• How ice dams contribute to roof leaks
• Warning signs of winter-related roof damage
• Prevention tips to protect your home

Common Reasons Roofs Leak When It Snows

Your roof is designed to withstand the elements, but heavy snow and freezing temperatures can create conditions that lead to leaks. Here are some of the most common causes:

1. Ice Dams

One of the most notorious culprits behind winter roof leaks is ice dams. These form when snow melts on your roof and refreezes at the eaves, preventing proper drainage. As water backs up behind the ice dam, it can seep under shingles and into your home.

2. Condensation in the Attic

Improper attic ventilation and insulation can cause warm air from your home to rise and condense under the roof deck. Over time, this moisture can lead to leaks, mold growth, and structural damage.

3. Cracked or Worn Flashing

Flashing around chimneys, skylights, and vents is designed to seal vulnerable areas of the roof. However, cold temperatures can cause metal flashing to contract, creating gaps where water can enter.

4. Clogged Gutters

If your gutters are filled with leaves and debris, melting snow and ice won’t drain properly. Water can overflow and seep into the roofline, leading to leaks and water damage.

5. Heavy Snow Accumulation

Excessive snow buildup adds weight to your roof and can lead to stress fractures or collapse in extreme cases. As the snow melts, any existing vulnerabilities in your roof’s structure may allow water infiltration.

6. Aging or Damaged Shingles

Older shingles may have cracks or gaps that aren’t noticeable in dry conditions but become problematic when snow melts. Water can seep through these weak points, causing leaks inside your home.

How Ice Dams Contribute to Roof Leaks

Ice dams are one of the most damaging winter roofing issues. They occur when heat from your home causes snow on the roof to melt, but the colder eaves remain frozen. This leads to:

• Water pooling behind the ice dam
• Increased pressure on shingles and flashing
• Water infiltration into attic spaces

Signs of an Ice Dam Problem:

• Large icicles forming along the roof’s edge
• Water stains on ceilings or walls
• Peeling paint or sagging drywall
• Uneven melting patterns on the roof

How to Prevent Roof Leaks in Winter

Taking proactive steps before winter arrives can prevent roof leaks and extend the lifespan of your roof. Here’s what you can do:

1. Ensure Proper Attic Insulation

A well-insulated attic prevents heat from escaping through the roof, reducing the likelihood of snow melting unevenly and forming ice dams.

2. Improve Roof Ventilation

Proper ventilation allows cold air to circulate in your attic, preventing warm air buildup that contributes to condensation and ice dams.

3. Keep Gutters Clean

Clear gutters and downspouts before winter to ensure proper drainage. Consider installing gutter guards to minimize debris buildup.

4. Remove Excess Snow

Use a roof rake to safely remove heavy snow from your roof after a storm. This reduces the risk of ice dam formation and structural stress.

5. Schedule a Roof Inspection

A professional inspection from S&K Construction and Remodeling LLC can identify potential vulnerabilities and address them before winter sets in.

When to Call a Roofing Expert

If you notice signs of a roof leak during snowfall, it’s crucial to act fast. Contact a trusted roofing contractor like S&K Construction and Remodeling LLC to assess the damage and provide solutions. As an Owens Corning Preferred Contractor, we serve homeowners across Northeast Ohio with expert winter roofing services.

Don’t let winter weather wreak havoc on your home. Schedule a consultation today to ensure your roof is ready for the snow and ice ahead!