Metal vs. Asphalt: The Comparison Across 30 Years

Comparing a metal roof to an asphalt roof on the day you buy it is comparing the wrong day. The roof lives for decades, so the honest comparison runs across decades. I am going to hold both systems to the same five questions I use for every roof, and then I am going to tell you where asphalt wins, because it does sometimes.

Asphalt shingles

What it is. A fiberglass mat coated with asphalt and surfaced with mineral granules, nailed on in overlapping courses. It is the roof on about nine in ten American houses.

What it does well. It is the cheapest roof to buy and the fastest to install, almost any roofer can put it on, and it looks the way people expect a roof to look. Repairs are simple. For a short hold on a house, that is a real set of advantages.

Where it fails. It is built to wear out. Granules wash off, the mat dries and curls, and the sun does the rest. Today's shingles are about a third lighter than they were 20 years ago, made largely of limestone filler with a relatively small share of actual asphalt, and they are rated to last 12 to 20 years here. The "30-year" on the wrapper is a warranty term, not a lifespan, and what that warranty actually covers is its own article. Wind peels shingles a tab at a time. Hail knocks granules off and starts the decline early.

Who it fits. Anyone selling within a few years. Anyone for whom the lowest number this year is the whole question. A rental or a flip.

Who it does not fit. Anyone who plans to be in the house past one shingle cycle and does not want to do this again.

Metal

What it is. Steel panels or shingles with a factory finish, attached with concealed clips or, on the cheapest systems, exposed screws. Not all metal roofs are alike, and how the seam is formed decides most of the difference.

What it does well. It lasts 50 to 70 years or more. It sheds snow and water, it does not burn, it holds in wind that peels shingles, and with a PVDF finish it keeps its color for decades. It reflects heat, which lowers cooling load. It is roughly half the weight of asphalt. Many insurers give a discount for an impact-rated roof.

Where it fails. It costs more the day it goes on. It is less forgiving of a bad install, and the failures I see are almost all workmanship: flashing done with sealant, panels pinned so they cannot move, fasteners driven wrong. An exposed-fastener roof has washers that wear out around year ten to twelve. Hail can dent it cosmetically. It is not maintenance-free.

Who it fits. A homeowner who plans to stay, wants to roof once, and is comparing cost per year rather than sticker price.

Who it does not fit. A short hold. A repair budget. Someone who wants a roof that never shows a mark. Someone comparing it to barn metal and expecting barn prices.

The 30-year math

Asphalt is a cycle. Over 30 years most homes replace a shingle roof two or three times, and roofing prices rise about 3 percent a year, so each replacement costs 45 to 60 percent more than the last. Our homeowner presentations illustrate it with one house: about $46,031 for a standing seam roof over 30 years against about $151,640 for asphalt once the second and third roofs are counted at their inflated prices. That is one example, not your quote, and it does not include energy savings or an insurance discount. It shows the shape: one purchase against three rising ones.

Stop comparing sticker prices and compare cost per year of protection. Divide what you pay by the years you get, for both, honestly, for your house. That one number usually settles the question better than any pitch could. The cost article goes through what drives the metal number.

Where asphalt still wins

I am not going to pretend asphalt is never the answer. If you are selling soon, or the home is a short-term hold, the up-front savings are the right financial move, and you will not recover a metal premium from a buyer in this market. The cheapest roof is not always the wrong roof. It is the wrong roof when you plan to stay and end up buying it again and again.

The question underneath

Is this a forever home, or a short-term plan? That question answers most of this article. If it is short-term, buy good asphalt from someone who installs it well, and do not let anyone talk you into metal. If you plan to stay, the math usually points the other way, and the decision becomes which metal system your roof allows.

The most expensive roof is the one you have to buy twice, or three times. Now you have enough information to decide.