How Long Does a Roof Really Last?

The short answer

There is no single number, but there are typical ranges. A standard asphalt shingle roof often lasts about 15 to 30 years. Metal roofing can often run 40 years or more. Clay and concrete tile, and slate, can last even longer when they are installed well and looked after. Treat those as rough ranges, not promises. Your roof's actual life depends on the product, the installation, the weather and the care it gets.

Why asphalt shingles vary so much

Two homes on the same street can have the same shingle and very different results. Shingles come in good, better and best grades, and the thicker ones usually hold up longer. A roof facing south or west takes more sun and heat. A roof with poor attic ventilation cooks from underneath, which dries out the shingles early. Add a few big storms or falling branches and the gap grows.

What shortens a roof's life

Heat and sun are the quiet killers. Over the years they dry out the asphalt and the granules start to loosen. Trapped moisture and poor ventilation in the attic do damage from the inside. Gutters packed with leaves can let water back up under the edge of the roof. Moss and algae hold moisture against the surface. And rushed or cut-corner installation, such as missed flashing details or too few nails, can take years off a roof that looked fine on day one.

Signs your roof is getting tired

Look from the ground, or use binoculars. Common signs include shingles that curl at the edges or look cupped, bare patches where the granules have worn away, a lot of granules in your gutters, cracked or missing shingles, and rust on the flashing. Inside, watch for stains on the ceiling, light coming through the attic boards, or a musty smell upstairs. One sign alone is not always a crisis, but several together usually mean it is time to have someone look closely.

Please do not climb up there to check. A roof that is near the end of its life can be slick, brittle and unsafe to walk on.

Repair or replace

A newer roof with a small, local problem is usually a repair. An older roof with problems in many spots often costs more to patch again and again than it would to replace. A common rule of thumb is to think about replacement when repairs are adding up and the roof is past the middle of its expected life, but every house is different. We will tell you if a repair makes sense, even though that is a smaller job for us.

How to get more years from your roof

A little attention goes a long way. Keep gutters clear, trim branches that touch the roof, and clean off debris that sits in valleys. Have the roof looked at after major storms and about once a year, ideally by a professional. Make sure the attic is ventilated and insulated properly. Small fixes to flashing and sealant are cheap compared to a leak that has been soaking the decking for a season.

It also helps to know what is above you. If you have a chimney, skylights or a lot of roof valleys, those are the spots where leaks usually start, so they deserve a closer look during any visit.

Planning for the cost

Roof replacement is one of the bigger home expenses, and prices vary a lot with size, pitch, materials and your area. It is easier to handle if you see it coming. When your roof is in its last third of expected life, start getting estimates, even if you are not ready to commit. That way you can choose a time that suits you instead of making a rushed decision after a leak.

When you do get estimates, compare more than the price. Look at the brand and grade of shingle, whether the old roof is torn off, what underlayment and flashing are included, how ventilation is handled, and who stands behind the workmanship. Two quotes that look the same on the bottom line can describe very different roofs.