Roof leak in winter: Causes and what to do?

Winter roof leaks can be a serious issue, causing water damage, mold growth, and structural problems. Understanding th causes of winter roof leaks and how to prevent and address them can help protect your home or business.

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What causes winter roof leaks?

1. Ice dams

Ice dams form when heat escapes from the attic, melting snow that then refreezes at the roof’s edge. The trapped water has nowhere to drain and seeps under shingles, leading to leaks.

2. Attic condensation

Poor ventilation causes warm, moist air to accumulate in the attic. Condensation builds up on the underside of the roof, leading to water damage and mold growth.

3. Exhaust fans

Bathroom and kitchen exhaust fans that vent into the attic increase moisture levels. This can lead to moisture buildup and dripping water, mistaken for a roof leak.

4. Compromised flashing

Flashing seals around chimneys, vents, and skylights can deteriorate due to temperature fluctuations. Cracked or loose flashing allows water to seep into the roof structure.

5. Clogged gutters

Debris-filled gutters prevent proper water drainage. Water overflows and backs up under shingles, causing leaks.

6. Damaged shingles

Heavy snow, ice, and wind can crack, loosen, or dislodge shingles. Missing or broken shingles expose the underlayment to moisture penetration.

7. Low-slope roof style

Low-slope or flat roofs allow snow and ice to accumulate without proper runoff. Water pools on the roof surface, increasing the risk of leaks.

8. Structural damage caused by water

Prolonged exposure to water weakens roofing materials and the underlying structure. This can lead to sagging, rotting wood, and interior water damage.

9. Shingles are nearing end of life

Roofs that are 15-20 years old or more may have weakened materials. Aging shingles are more prone to cracks and leaks, especially in winter conditions.

10. Exposed nailheads

Improperly driven or loose nails can create entry points for water. Water infiltrates through nail holes, causing small but persistent leaks.

Prepare your roof for winter with our professional services. Schedule your consultation today and ensure you’re ready for the winter season! Call us at (781) 874-0248 now!

How to prevent roof leaks during winter?

• Improve attic insulation and ventilation to reduce heat loss.
• Regularly clean gutters to ensure proper drainage.
• Install heat cables to prevent ice dams from forming.
• Check and repair flashing around chimneys and vents before winter.
• Replace missing or damaged shingles to prevent exposure to moisture.
• Trim overhanging branches to minimize snow accumulation on the roof.
• Schedule a professional roof inspection before the winter season.

What to do if you have roof leaks in winter?

• Contain the water by placing buckets and towels under leaks.
• Remove excess snow from the roof using a roof rake.
• Temporarily seal leaks with roofing tar or caulk until professional repairs can be made.
• Call a professional roofing contractor for immediate repairs.
• Address attic ventilation issues to prevent future leaks.

FAQs: Roof leaks in winter

Is it safe to go on the roof in winter?

No, walking on an icy or snow-covered roof is dangerous. Always use roof rakes from the ground or hire professionals for snow removal.

Is it a roof leak or condensation?

Roof leaks leave water stains and dripping areas in ceilings and walls. Condensation occurs in the attic due to trapped moisture and inadequate ventilation.

Is it normal for a roof to leak in heavy rain?