Most roofs don't fail all at once. They give warning signs for years — curling shingles, granules in the gutters, a ceiling stain that returns every spring. The trick is knowing which signs mean "keep an eye on it," which mean "call for a repair," and which mean the roof is done.
This checklist walks through what to look for, from the ground and from the attic, with the northern Illinois climate in mind. It's the same thinking we use when we inspect a roof as part of our roofing services. And it comes with an honest caveat: plenty of roofs with a problem or two don't need to be replaced. Sometimes a repair is exactly the right call.
Everything on this checklist can be checked from the ground, from a window, or from inside your attic. Use binoculars or your phone's zoom for a closer look. Don't climb onto the roof — shingles are slippery, older decking can be soft, and a fall from roof height is a serious injury. Leave the up-close inspection to a professional.
Start With Your Roof's Age
Age isn't the only factor, but it frames everything else. A cracked shingle on a young roof is a repair. The same crack on a roof near the end of its life is often a preview of what's coming everywhere.
As a general guide in northern Illinois:
- Asphalt shingles typically last 20–30 years.
- Metal and steel roofing can last 40–70 years.
Where your roof lands in that range depends on material quality, installation, and attic ventilation.
If You Don't Know When It Was Installed
Many homeowners don't, especially if they bought the house. A few places to look:
- Your own records. Closing documents, the home inspection report from your purchase, or the seller's disclosure may mention roof age.
- Permit history. Full roof replacements generally require a permit, so your city or county building department may have a record of when the last one was done.
- The previous owner or neighbors. A quick question can save a lot of guessing — neighbors often remember when the roofing crew was there.
If your asphalt roof is 20 years old or more, it's worth having it looked at even if nothing seems wrong yet.
Signs You Can Spot From the Ground
Walk around the house on a clear day and look at every slope you can see.
Curling, Cupping, or Clawing Shingles
Healthy shingles lie flat. As asphalt shingles age and lose flexibility, they start to deform. Cupping is when the edges turn upward. Clawing is when the edges stay down but the middle bulges up. Either way, the shingle is no longer sealing properly, and wind can get underneath it. One or two curled shingles can be a repair. Curling across whole slopes is a classic sign the roof is wearing out.
Cracked or Missing Shingles
A few shingles blown off in a windstorm happen even to good roofs, and they can usually be replaced. But if you're finding shingles in the yard after every storm, or see cracks across many shingles, the material has likely become brittle with age.
Granule Loss and Bald Spots
The sandy granules on asphalt shingles protect the asphalt underneath from the sun. Check your gutters and the ground below your downspouts. A small amount of granules is normal, especially on a newer roof shedding loose excess. Heavy accumulation, or shingles with dark, smooth bald patches, means the protective layer is wearing away and the shingles will deteriorate faster from here.
A Sagging Roofline
Look along the ridge and across each slope. They should be straight and flat. A dip, a swayback ridge, or a slope that looks wavy can point to a weakened roof deck or a structural problem underneath — often from long-term moisture. This one shouldn't wait. Call for an inspection promptly.
Moss and Dark Streaks
Let's be honest about this one. The dark streaks you see on many northern Illinois roofs, often on shadier slopes, are usually algae. They look bad, but they're mostly a cosmetic issue on their own and aren't a reason to replace a roof. Moss is different. Moss holds moisture against the shingles and can grow underneath the edges and lift them, which speeds up deterioration. A little moss can be addressed. A roof with heavy moss growth and other aging signs deserves a closer look.
Damaged Flashing, Pipe Boots, or Chimney Details
Many leaks aren't caused by shingles at all. They start at flashing — the metal that seals where the roof meets a chimney, wall, skylight, or valley — and at the rubber pipe boots around plumbing vents. Look for bent or lifted metal, gaps, rust, and cracked boots. Pipe boots and flashing often wear out before the shingles do, and on an otherwise sound roof, replacing them is a straightforward repair.
More Than One Layer of Shingles
Some roofs were "layered" in the past — new shingles installed right over the old ones. Look at the edge of the roof along the eaves or the gable ends. If you can see a thick, stacked edge, there may be two layers. A second layer adds weight, traps heat, and hides the condition of the deck. When a roof that's already been layered needs work, a full tear-off is usually the right answer, and most building codes won't allow yet another layer on top.
Signs Inside Your Attic and Home
Your attic often tells you more than the outside of the roof does. On a sunny day, take a flashlight up — if you can do so safely, stepping only on joists — and look for these.
Daylight or Water Stains in the Attic
If you can see daylight through the roof boards, water can get in too. Also look for dark stains or streaks on the underside of the roof deck and rafters, damp or matted insulation, and a musty smell. In winter, frost on the underside of the deck or on nail tips points to moisture and ventilation problems that can shorten your roof's life.
Recurring Leaks in Different Spots
One leak at a chimney is usually a flashing repair. But if you've had a leak fixed in one place and then another one shows up somewhere else, and then another, that pattern often means the roof is failing as a system. Chasing leaks one at a time on an aging roof tends to cost more over time than addressing the roof as a whole.
Rising Energy Bills and a Hot Attic
An attic that's extremely hot in summer, or bills that keep creeping up, can point to poor attic ventilation. Ventilation problems don't mean you need a new roof, but they bake shingles from underneath and contribute to winter ice dams. Balanced airflow starts at the soffits — our soffit and fascia services include an attic ventilation assessment.
Winter and Storm Warning Signs
Ice Dams Every Winter
If thick ridges of ice form along your eaves year after year, water can back up under the shingles and into your walls and ceilings. Ice dams are usually an attic insulation and ventilation problem more than a shingle problem, but repeated years of them take a toll on the roof deck and the fascia. Our guide to why ice dams form and how to prevent them covers the causes and fixes in detail.
After a Hailstorm or Major Windstorm
Hail damage is often invisible from the ground. Bruised shingles, cracked mats, and knocked-loose granules may not leak for months. If a storm has rolled through your neighborhood, look for dents in gutters, downspouts, and your AC unit — they're a good clue about what the roof took. Our guide to hidden hail damage signs explains what to look for, and our storm damage repair team offers free inspections with a written report.
Repair or Replace? How to Decide
Finding one of the signs above doesn't automatically mean a new roof. Here's how we think about it.
A Repair Usually Makes Sense When:
- The damage is isolated to one area — a few missing shingles, a cracked pipe boot, a flashing leak at the chimney.
- The roof is relatively young and the rest of it is in good condition.
- The decking underneath is solid.
Replacement Usually Makes Sense When:
- The roof is at or near the end of its expected lifespan.
- The problems are widespread — curling, granule loss, or cracking across multiple slopes.
- The roof deck is soft, rotted, or sagging.
- There are already multiple layers of shingles.
- You're dealing with repeated leaks in different places.
The Matching Problem
One thing homeowners don't always expect: repairs on an older roof rarely match perfectly. Shingle colors and product lines change over time, and even the same color weathers differently after years in the sun. A patch on a roof you plan to keep for years may be very visible. That doesn't rule out a repair, but it's worth knowing going in.
We never push a full replacement when a repair will do the job. If your roof has good years left, we'll tell you — and we'll tell you what to keep an eye on so you're not surprised later.
What a Professional Roof Inspection Looks At
Some things can only be judged up close. A thorough roof inspection covers:
- Shingle condition on every slope — flexibility, sealing, granule coverage, cracking, and any storm impacts.
- Flashing and penetrations — chimneys, walls, valleys, skylights, vents, and pipe boots.
- The roof deck — soft spots underfoot and signs of rot or sagging.
- Attic conditions — moisture, staining, daylight, insulation, and ventilation balance.
- Edges and drainage — drip edge, gutters, fascia, and soffit condition.
- Number of layers and anything that affects how a future replacement would be done.
You should come away knowing what's wrong, what's urgent, and what can wait — not just a quote.
Why Northern Illinois Is Hard on Roofs
Roofs here work harder than in milder climates:
- Freeze-thaw cycles. Water gets into small gaps, freezes, expands, and widens them. Repeat that all winter and small problems grow.
- Snow load and ice. Heavy, lingering snow adds weight and feeds ice dams along the eaves.
- Summer hail and wind. Severe storms can bruise shingles, strip granules, and tear shingles loose in a single afternoon.
- Big temperature swings. Shingles expand and contract between hot summer days and frigid winter nights, which wears on seals and fasteners over time.
Many homes across Rockford, Loves Park, and the surrounding towns were built decades ago with attic insulation and ventilation that fall short of what's typical today, which adds to the strain.
Frequently Asked Questions
How long does an asphalt shingle roof last in northern Illinois?
Asphalt shingles typically last 20–30 years here, and metal and steel roofing can last 40–70 years. Installation quality and attic ventilation have a big effect on where your roof lands in that range.
Can I just put new shingles over my old roof?
Sometimes, but it's rarely the best choice. A layover hides the condition of the roof deck, adds weight, and isn't an option once a roof already has more than one layer under most building codes. A full tear-off lets us inspect the decking and install a complete new system.
How long does a roof replacement take?
Most full roof replacements on a standard northern Illinois home take 1–2 days. Larger homes or complex rooflines may take longer. We clean up daily and pull all required permits as part of the job.
Is a roof inspection free?
Yes. We offer free roof inspections and estimates with no obligation. You'll get a straight answer on whether your roof needs a repair, a replacement, or simply more time.
How We Help
Littlefield Siding has been working on northern Illinois roofs since 1986. When you call us about your roof, the same crew handles it from the estimate to the final walkthrough — no subcontractors, no handoffs.
We start with a free inspection of the roof, flashing, and attic, and walk you through what we found. If a repair will solve the problem, that's what we'll recommend. If replacement is the better investment, we'll explain why and give you a written estimate with no pressure attached.
When replacement is the right call, we install GAF and Owens Corning asphalt shingles as well as metal and steel roofing. We tear off the old roof, inspect the decking, pull the required permits, and most jobs wrap up in 1–2 days. For active leaks, we also offer emergency tarping.
Not Sure What Your Roof Needs?
If you checked off more than one item on this list — or you just don't know how old your roof is — it's a good time for a professional look. Call us at (815) 636-6446 or request a free inspection online.
We work with homeowners across Loves Park, Rockford, Machesney Park, Roscoe, Belvidere, and other northern Illinois communities. Learn more about our full roofing services, or if a recent storm is what has you worried, start with our guide to what insurance adjusters look for on your roof.
