- Age matters: most PNW asphalt roofs 20–30 yrs
- Repair vs. replace: an honest call
- Local crews — SW WA & Portland metro
- Free roof inspections
The clearest signs you need a new roof are age — most asphalt roofs in the Pacific Northwest reach the end of their life around 20–30 years — plus repeated or multiple leaks, shingles that are widely curling or shedding their granules, long-standing moss that has lifted or rotted shingles, and any sagging roofline, soft decking, or attic moisture. One or two isolated problems usually mean a repair; several of these together, especially on a roof past 20 years, usually mean replacement is the more cost-effective call.
Most homeowners want to repair rather than replace — and at Jobin Roofing we agree more often than you’d expect. A good repair can buy years of life at a fraction of the cost of a new roof. But sometimes patching is just delaying the inevitable, and chasing leak after leak ends up costing more than a replacement would have. Below are the seven clearest signs that, in the wet Portland–Vancouver climate, it’s time to stop patching. (If you’re weighing the basic repair-or-replace question itself, start with our companion guide on roof repair vs. replacement.)
Why this decision is different in the Pacific Northwest
Roofs here face heavy, consistent rainfall, persistent moss and algae, long damp seasons with little drying time, and the occasional snow or ice event. Because of that, roofs in Clark County and the Portland metro age faster in certain ways than they would in a drier climate — a roof that might still be “fine” in Arizona can be a real problem sooner here. That’s why the signs below carry more weight locally, and why age alone is worth taking seriously.
How long does a roof last in the Pacific Northwest?
Most asphalt roofs in the Portland–Vancouver area last 20 to 30 years, and our wet climate pushes them toward the lower end of that range. Lifespan depends heavily on the material:
| Roofing material | Typical lifespan | What shortens it here |
|---|---|---|
| 3-tab asphalt | 15–18 years | Moss, deep shade, poor attic ventilation. Often the first to fail in our climate. |
| Architectural (dimensional) asphalt | 25–30 years | Same factors, but the heavier mat holds up longer. Expect the lower end here. |
| Standing-seam metal | 45–60 years | Very durable in rain. Fastener and flashing details are what age first. |
| Tile | ~50 years | The tile outlasts the underlayment beneath it, which is often closer to 30 years. |
| Cedar shake | 40–50 years | Only with regular maintenance. Moss and constant damp shorten this considerably. |
If your roof is within about five years of the end of its expected life and showing any of the signs below, it’s worth an inspection and starting to budget — not an emergency, but not a wait-and-see either.
The 7 signs it’s time to replace your roof
- Your roof is past about 20 years old. Use the lifespan table above as your baseline — 3-tab asphalt runs 15–18 years, architectural asphalt 25–30, metal and tile considerably longer. In our wet climate, asphalt roofs tend toward the lower end of their range. Once you’re near or past that window, replacement is usually a question of when, not if.
- You’re seeing multiple leaks — or the same leak keeps coming back. A single isolated leak is often a straightforward repair, and our roof leak repair cost guide covers what that typically runs. But repeated leaks, leaks in several spots, or a leak that reappears after being “fixed” point to a systemic problem — failing underlayment, multiple flashing failures, or advanced shingle wear — rather than one bad spot.
- Shingles are curling, cupping, or cracking. Edges that pull up, centers that rise, or shingles that crumble when flexed mean the material has aged and lost its flexibility, often sped along by moisture cycles or poor attic ventilation. A few damaged shingles can be replaced; widespread curling means the roof is near the end of its life.
- Bald spots and granule loss. Those sand-like granules protect the asphalt from UV. When you see them collecting in gutters and at the base of downspouts, or bald dark patches on the shingles themselves, the shingles are wearing out and no longer shielding the roof.
- Moss that has lifted or rotted the shingles. This is the PNW signature. A light film can be treated with professional cleaning, but years of heavy moss that has pried shingles apart and held moisture against the roof causes damage that cleaning can’t undo.
- A sagging roofline, soft spots, or attic moisture. This is the most serious sign — it points past the shingles to the roof decking and structure underneath. Visible dips in the roofline, a spongy feel underfoot, or damp sheathing and stained insulation in the attic mean water has been getting in for a while. Don’t wait on this one.
- Your repair bills are stacking up. We’ve watched homeowners spend $1,500, then $2,000, then $3,000 on repeated repairs and replace the roof anyway within a couple of years. When repairs start stacking, you’re usually paying toward a replacement in installments — and paying more than one clean replacement would have cost.
Why does my roof look wavy?
A wavy or rippled roof surface is one of the most common things homeowners ask us about, and the answer depends entirely on how old the roof is. The two causes are completely different problems.
Wavy on a newer roof
If the waves showed up within the first year or two, the shingles are usually not the problem. The most common causes are underlayment that wrinkled during installation — felt absorbs moisture, buckles, and telegraphs through the shingles above it — or shingles that were stored improperly and installed with a bend already in them. Occasionally it is decking installed without the proper gap between sheets, so the panels press against each other as they expand.
Cosmetic waves from underlayment wrinkles often settle over a warm season or two. Waves that follow a consistent, repeating line usually trace back to the decking underneath and are worth having looked at, because they will not settle out on their own.
Wavy on an older roof
On a roof past 15 or 20 years, waviness is a structural signal rather than a cosmetic one. Water that has been getting past the shingles saturates the decking, and OSB or plywood that has been repeatedly wet swells, delaminates, and loses its flatness. What you are seeing from the ground is the deck sagging between the rafters.
This version is not cosmetic and does not settle. It usually means the decking needs replacing in the affected sections, which is work done during a re-roof rather than as a patch. If the waves come with any of the other signs on this page — especially soft spots underfoot or attic staining — treat it as a replacement conversation.
One Portland-specific trap: shingles on a low slope
Here’s a local one we see constantly: asphalt shingles installed over a low-slope section (think a 2:12 pitch). It may technically meet code, but shingles aren’t designed to shed water well at that angle in our rain — and these setups fail early again and again. On those sections a proper low-slope system like TPO is usually the smarter long-term choice. If part of your roof is low-slope and leaking, that’s a strong signal to replace it correctly rather than patch it one more time.
Are you solving the problem, or just delaying it?
This is where most decisions go sideways. A repair has a lower upfront cost; a replacement costs more but resets the roof’s lifespan. A local replacement in Clark County / SW Washington typically runs about $14,000–$20,000 depending on size, material, and complexity — real money, which is exactly why the honest question matters: if we repair this, what’s the realistic chance of more leaks in the next 12–24 months? If the answer is “pretty likely,” replacement usually wins. Our roof replacement cost guide breaks the pricing down further.
One exception worth knowing: if the damage came from a windstorm or a fallen limb rather than age, the path is different. Sudden storm damage is typically an insurance matter — see our storm damage roof repair guide for how claims and documentation work.
Our approach at Jobin Roofing
We don’t start by asking “what’s the cheapest fix?” or “what can we sell?” We ask what the best solution is for this specific roof and the conditions it faces. Sometimes that’s a repair. Sometimes it’s a full replacement even when a patch is technically possible. And sometimes it’s a better system altogether, because over the long run that’s what actually protects your home. If you’re unsure, the right next step is a professional look — and asking for both options rather than just one.
Not sure if it’s a repair or a replacement?
We’ll take an honest look, document what we find, and give you a straight recommendation — repair, replace, or nothing to worry about yet. No pressure. Serving Portland, Vancouver & all of SW Washington.
Book a free roof inspection WA (360) 952-3998 · OR (503) 523-3449Frequently asked questions
How long does a roof last in the Pacific Northwest?
It depends on the material, and our wet climate tends to push asphalt toward the lower end of its range. Three-tab asphalt lasts about 15–18 years, architectural (dimensional) asphalt 25–30, standing-seam metal 45–60, tile around 50 (though the underlayment beneath it is often closer to 30), and cedar shake 40–50 with regular maintenance. Heavy moss, deep shade, and poor attic ventilation all shorten these numbers. If your roof is within about five years of the end of its expected life and showing any other signs on this page, it’s worth getting an inspection and starting to budget.
Why does my roof look wavy?
It depends on the roof’s age. On a newer roof, waviness usually comes from underlayment that wrinkled during installation, shingles that were stored or handled badly before going on, or decking installed without proper expansion gaps — often cosmetic, and mild cases can settle over a warm season. On an older roof, waviness usually means the decking underneath has been repeatedly wet and has swelled, delaminated, or sagged between the rafters. That version is structural, does not settle on its own, and generally means the affected decking needs replacing during a re-roof.
Can I just repair my roof instead of replacing it?
Often, yes — and we’ll tell you when a repair is the right call. Isolated damage on a roof with years of life left is usually a straightforward repair, not a reason to replace a sound roof. The time repair stops making sense is when problems stack up: multiple or recurring leaks, widespread shingle wear, or a roof already near the end of its lifespan. The honest test is to ask what the realistic chance of more leaks is in the next year or two. If it’s high, repeated repairs usually cost more than one clean replacement.
Is moss actually damaging my roof, or is it just cosmetic?
Both, depending on how far it’s gone. A light surface film is mostly cosmetic and can be handled with professional cleaning and preventive measures like zinc or copper strips. But heavy, long-standing moss is genuinely damaging: it pries shingle edges up, holds moisture against the roof, and keeps the surface from drying — which accelerates rot and shingle failure underneath. By the time moss has lifted shingles, cleaning alone usually can’t reverse the damage. In our climate it’s worth treating moss early rather than letting it establish over years.
Does a sagging roofline always mean I need a replacement?
A sag is the sign to take most seriously, because it points below the shingles to the decking or structure. It doesn’t automatically mean a full replacement, but it does mean water has likely been getting in for a while, and it needs a professional look promptly rather than a wait-and-see. Sometimes the fix is localized decking repair plus addressing the ventilation or leak that caused it; sometimes the damage is widespread enough that replacement is the sound choice. Either way, a sagging or spongy roof is not something to patch over and ignore.
How much does a roof replacement cost in the Portland–Vancouver area?
A typical roof replacement in Clark County and SW Washington runs about $14,000–$20,000, though the real number depends on your roof’s size, the material you choose, its pitch and complexity, and whether the decking underneath needs work. Larger or steeper roofs and premium materials push higher; smaller, simple roofs come in lower. If storm or sudden damage is involved, insurance may cover part or all of it. The only way to get an accurate figure is an inspection and measured quote — our replacement cost guide walks through the price drivers in more detail.
Should I get a second opinion before replacing my roof?
Yes — and a good roofer will encourage it. Roofing is a significant investment, and you want a recommendation based on your roof’s actual condition, not a sales target. Ask any roofer to show you photos of what they found, to explain why they’re recommending repair or replacement, and to give you both options where both are viable. Be cautious of anyone pushing a full replacement without documenting a clear reason, or of out-of-area “storm chasers” who won’t be around to stand behind the work. An honest local contractor will give you a straight assessment, even when that’s “you’ve got a few years left.”
