The short answer
What New Shingles Can Do
New shingles give your roof a fresh, water-shedding surface. They cover cracks and gaps in the old layer, and they can stop leaks that start from worn or missing shingles. In a mild marine climate with wet winters, a sound shingle layer is your first defense against water entering your home.
But shingles are only as good as what lies beneath them. If the roof deck has rot, or if flashing around chimneys and valleys is rusted or lifted, water can still find its way in. New shingles don't fix those hidden problems. You need to check the entire roof system before deciding that new shingles will solve your leak.
When Shingles Alone Are Not Enough
A roof leak often starts at a penetration, like a vent pipe, a skylight, or a chimney. The flashing around those spots can fail long before the shingles wear out. If your leak is near a penetration, new shingles won't address the real cause. You might need to replace or reseal the flashing instead.
Also, if water has already soaked into the roof deck or the insulation below, you could have hidden rot or mold. New shingles would trap that moisture inside, making the problem worse. In that case, the damaged deck must be repaired first. A thorough inspection can reveal whether you need more than just a re-roof.
- Check for soft spots or rot in the roof deck
- Look for cracked or lifted flashing around chimneys and vents
- Inspect the underlayment or ice-and-water shield for tears
- Ensure gutters and downspouts are clear to prevent backup
- Verify attic ventilation to reduce moisture buildup
How to Inspect Before Replacing
Before you commit to new shingles, take a close look at your roof from the outside. Use binoculars to spot missing or curled shingles, but also check for rusted nails or exposed felt. From inside your attic, look for daylight coming through the roof, which signals holes. Dark stains on rafters or insulation can indicate past or active leaks.
If you're not comfortable climbing on your roof, a local water damage pro can do a roof leak inspection and moisture mapping. They can identify where water is getting in and whether the deck is sound. That information helps you decide if new shingles will actually stop your leak or if you need roof leak repair and water damage mitigation first.
Cost and Right Timing
Re-roofing costs often range from $5,000 to $15,000, but it depends on your roof size, pitch, and the type of shingles you choose. The final price also depends on whether the old shingles need to be torn off and if any deck repairs are needed. A steep roof or multiple layers of old shingles can raise the cost.
Timing matters. In Redmond, the wet season runs from late fall through early spring. If you plan to re-roof, aim for a dry stretch, because shingles need dry conditions to seal properly. If a leak appears during the rainy season, you might do temporary patching first, then schedule the full replacement when the weather cooperates.
What the Pros Can Do
When you hire a local water damage pro, they can assess the full scope of your roof problem. They can check for hidden moisture in the deck and insulation, and they can recommend whether a simple re-roof will work or if you need structural drying and dehumidification first. They can also handle the removal of old shingles and the installation of new ones.
The pros can also repair flashing, replace damaged deck boards, and ensure proper ventilation. Their work usually involves removing the old layer, inspecting the deck, and installing new underlayment and shingles. That thorough approach gives you the right chance of stopping leaks for good. Just remember that no roof lasts forever, and regular maintenance is still needed.
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Call Now (425) 407-5186Frequently asked questions
How long do new shingles last?
Asphalt shingles typically last 20 to 30 years, while higher-end materials like cedar or composite can last longer. But lifespan depends on local weather, roof pitch, and installation quality. In a wet climate, you might need to replace them sooner if they're exposed to constant moisture and algae growth.
Can I put new shingles over old ones?
Sometimes, but it's not always wise. Adding a second layer adds weight and can hide deck rot. If your roof already has two layers, building codes often require a full tear-off. A pro can inspect the deck and tell you if an overlay is safe or if a full replacement is necessary.
What if the leak continues after new shingles?
If a leak persists after re-roofing, the problem is likely not the shingles. It could be a flashing issue, a crack in the deck, or a leak from a plumbing vent that penetrates the roof. You'll need a water damage inspection to trace the source. Sometimes the leak is coming from a wall or window, not the roof.