Post-Winter Roof Inspections in the Pacific Northwest: Why They Matter (Especially for Aging Shingle Roofs)

The Pacific Northwest is no stranger to wet, chilly winters. Between pounding rainstorms, the occasional snow dump, and freezing overnight temps, your roof takes a beating from November through March. And if your roof is already showing its age? That winter wear and tear could mean leaks, damage, and costly repairs ahead.

That’s why spring is the perfect time for a post-winter roof inspection—especially if you’ve got an older asphalt shingle roof. Catching issues early can save you thousands, and maybe even extend the life of your roof by a few more seasons.

What Winter Weather Does to Aging Roofs

Even if you didn’t have a major weather event this winter, the day-to-day exposure can be just as damaging over time. Here's what to look out for:

Snow: Freeze-Thaw Damage

While heavy snow isn't as common at lower elevations, even light snow that sticks around can cause:

• Ice dams that force water back under shingles
• Freezing and expansion that cracks old, brittle shingles
• Moisture retention that softens decking and underlayment

Rain: Constant Saturation

The PNW gets more than its fair share of rain. For older shingles that have lost their granules and protective coatings, that means:

• Water infiltration through microscopic cracks or gaps
• Accelerated wear from the constant moisture
• Moss and algae growth, especially in shaded or tree-covered areas

Cold: Shrinkage and Cracking

Frigid temps cause shingles to contract, especially at night. With aging shingles, that can lead to:

• Cracks and curling edges
• Exposed nail heads that invite leaks
• Loss of adhesion, letting wind and water get underneath

Signs It’s Time for a Post-Winter Roof Check

You don’t have to climb a ladder to know your roof might need attention. Look for:

• Shingles that look curled, cracked, or missing
• Dark streaks or green patches (hello, moss)
• Water stains on your attic ceiling or interior walls
• Debris in your gutters that looks like shingle granules

If you spot any of these, it’s time to call in a professional—or better yet, a roofing contractor who uses Owens Corning roofing products.

Why Choose Owens Corning for Replacement?

If your roof is ready to replace, Owens Corning offers some of the best solutions on the market for wet,

cold climates like the PNW.

Top Product Picks:

• Duration® Shingles with SureNail® Technology - These are built tough for windy, wet conditions and offer excellent adhesion to prevent shingle
• blow-off.
• WeatherLock® Ice & Water Barrier - Protects vulnerable areas like valleys and eaves from ice dam damage.
• ProArmor® Synthetic Underlayment - A strong, moisture-resistant barrier that helps keep the roof deck dry.

The Bottom Line

Spring is roof-check season in the PNW. If your shingle roof is 15+ years old, or if you noticed anything unusual over the winter, get a professional inspection ASAP. A little preventative maintenance now can save you a major headache later—and with Owens Corning’s durable, high-performance products, you’ll be better protected for whatever next winter throws your way.

Tip: Ask your roofer if they're an Owens Corning Platinum Preferred Contractor to get extended warranty coverage and peace of mind.

Your roof has had a long winter. Give it the check-up it deserves.