Repair

Signs Your Littleton Roof Is Near the End of Its Life

By Littleton Roof Repair · September 11, 2026 · 5 min read

Shingle roofs in Littleton don't fail all at once. They fail the way a tire wears: slowly, then faster, then on a bad day. A roof that's "fine" at 16 years is usually a roof at 20 that's losing a slope in a Chinook wind. Here's what to look for, from the ground and from the attic, and how to read the age.

The age math at altitude

A standard 30-year architectural shingle lasts 18–22 years in the South Metro. The reasons are specific to here:

• UV. At 5,400 feet the ultraviolet index runs about 25% higher than at sea level, and we get 300 days of sun. UV oxidizes the asphalt, making it brittle.
• Thermal cycling. A south-facing slope in January can go from 15°F at dawn to 110°F on the shingle surface by 2 p.m. That expansion and contraction, every day, all winter, cracks aging asphalt.
• Hail. Even hail too small to claim knocks granules loose every summer, and granules are the shingle's sunscreen.
• Wind. Downslope winds work at the seal strips.

Class 4 impact-resistant shingles with SBS-modified asphalt last longer under all four. But most of the roofs on 1970s–90s homes in Southpark, Ridgewood, Columbine and Northridge are the standard product, put on after the 2009 or 2017 hail seasons, and their clock is running.

From the ground

Stand across the street on a bright afternoon and look at the south and west slopes. Then compare them to the north slope.

Bald patches. Dark or shiny areas where the granules are gone and the asphalt mat is showing. Once the mat is exposed, UV eats through it in two or three summers. If you see bald patches on the south slope, the roof has a few years at most.

Curling and cupping. Shingle edges lifting at the corners (curling) or dishing in the middle (cupping). This is the asphalt shrinking as it dries out. Curled shingles are the ones the wind takes first.

Cracking. Fine cracks across the shingle surface, visible up close. Thermal cycling.

Uneven color. Patches of different shade where past repairs were made — a roof that's been patched three times is a roof telling you something.

Missing shingles or tabs after a wind night, especially if it happens more than once. A roof with a working seal strip doesn't lose shingles at 60 mph.

Sag. A dip in the ridge line or a wave in a plane. That's structural or decking, and it's a different conversation.

Moss or lichen on the north slope under the spruce. Less common in our dry air than in Portland, but it holds moisture against the shingle and shortens its life.

From the gutters

Pull a handful out of the gutter or look at the splash blocks. Granules — coarse, black or colored sand — in any quantity beyond a light dusting means the shingle surface is letting go. A roof in its first five years sheds a little from manufacturing. A roof in year 18 sheds constantly.

Also look for pieces of shingle — corners, slivers. Those don't come from a healthy roof.

From the attic

Go up with a flashlight on a bright day.

• Daylight through the deck, other than at vents.
• Water trails on the underside of the decking in more than one place. Multiple leaks on one roof is an age problem, not a spot problem.
• Rusted nail tips across the whole attic, which means the attic has been running wet — usually a ventilation problem that's also been aging the shingles from below.
• Soft or delaminated OSB. Press up on the decking between rafters. It should be rigid.
• Signs of hail. A hail-fractured deck shows as small broken spots when you look up at the OSB with the light at a low angle.

The seal strip test

This one needs a ladder and a warm day. At the bottom edge of a slope, slide a hand under a shingle tab and lift gently. On a sound roof the shingle is glued down by its seal strip and resists. On a roof past its life, the tabs lift freely. If they lift on the south slope, the next 80 mph night will find out.

Reading a hail history

A roof can be young by the calendar and old by damage. If the roof took a storm in a previous summer and nobody inspected it, hail bruises that didn't leak then are cracking through now. Bruised shingles lose granules faster around each hit, so a hail-scarred roof looks pockmarked from the ground and sheds granules at the rate of a much older roof.

What "near the end" actually means

It means you have choices, not that you have an emergency.

• Two to three years left: fix the pipe boots and any active leak now ($300–$800), budget for a replacement, and get an inspection each spring so nothing surprises you.
• One year or less: start pricing now, while you can pick the roofer instead of grabbing whoever's available after the next storm. The cost page has real numbers; the replacement page describes what a roof built for Front Range hail includes.
• Insurance renewals: if your carrier asks for the roof age and it's over 15, expect questions. A written inspection with the install year and photos answers most of them.

One more thing. If a storm hits an 18-year-old roof, the claim math changes — many Colorado policies pay depreciated value on older roofs. That's covered in repair versus replacement, and it's the strongest argument for not letting a roof reach year 22 by accident.