Roof Installation

A roof doesn't fail on a schedule. It degrades slowly for years, then all at once during a storm that wouldn't have caused a problem five years earlier. So when someone asks how long a roof lasts, or what a new one costs, the honest answer starts with "it depends on the material" — but the ranges below are a real starting point, not a marketing number pulled from a shingle wrapper.

How Long Does a Roof Actually Last?

Expected lifespan varies enormously by material:

Material	Expected Lifespan
3-tab asphalt shingles	15–20 years
Architectural (dimensional) shingles	25–30 years
Designer/luxury shingles	30–40 years
Standing seam metal	40–70 years
Corrugated/exposed-fastener metal	25–40 years
Wood shingles/shakes	30–50 years
Clay or concrete tile	50–100 years
Natural slate	75–150+ years

Most of those ranges come from manufacturer testing, and real-world performance tends to land on the lower end once you factor in actual weather, ventilation, and installation quality. Two identical shingle products installed on the same street can age a decade apart depending on attic airflow and how carefully the flashing was done.

What actually shortens a roof's life more than the material choice:

• Poor attic ventilation. A poorly ventilated attic can hit 150°F in summer, baking shingles from underneath while they're already taking sun from above. In winter, that same trapped moisture condenses on the roof deck and causes rot. This is the most common cause of early failure we see, full stop.
• Installation shortcuts. A roof system has around 30 individual components — underlayment, ice-and-water shield, flashing, starter strips, ridge caps — and shingles are only the visible part. Skimping on any one of them undermines the whole system even if the shingles themselves are fine.
• Roofing over an old layer instead of a full tear-off. It's cheaper up front and allowed by most codes for one layer, but it traps heat, hides decking problems, and shortens the new roof's effective life.
• Tree coverage and debris. Some shade helps by keeping shingles cooler; overhanging branches that drop debris and hold moisture hurt more than they help. Keep branches trimmed back several feet from the roofline.

What a New Roof Costs

Roof replacement runs $4 to $11 per square foot installed, which works out to roughly $8,000 to $22,000 for an average 2,000-square-foot roof — most of that spread comes from material choice, not labor:

Material	Cost per sq ft	Typical lifespan
Asphalt shingles	$1–$1.20 (material only)	15–30 years
Synthetic	$5–$12	25–50 years
Metal shingles/shakes	$6–$16	40–70 years
Wood shingles/shakes	$6–$15	30–50 years
Clay or concrete tile	$10–$20	50–100 years
Slate	$10–$30	75–150+ years

Labor typically makes up over half the total bill — professional roofing crews run $40 to $90 per hour per worker, and that number climbs with roof pitch, complexity (chimneys, skylights, multiple valleys), and whether the old roof has to be torn off and hauled away first. A steeply pitched roof alone can add $1,000 to $3,000 to a project versus a simple gable roof of the same square footage.

How to Choose a Roofing Company

Price matters, but on a purchase this size, the cheapest bid is rarely the best value — a roof installed wrong costs more in three years than a slightly higher quote costs today. A few things worth confirming before signing anything:

• License and insurance. Ask for proof of both — specifically general liability insurance, not just a business license. A reputable contractor hands this over without hesitation.
• A real inspection, not a drive-by quote. Someone should actually get on your roof and check the decking, flashing, and attic ventilation before quoting a price. A number generated from a satellite photo is a guess.
• A written, itemized estimate. It should spell out materials, scope, and whether any of the work is subcontracted — not just a single lump-sum number.
• References you can actually call. Any contractor doing good work has customers willing to vouch for them.
• Clear payment terms. You should never be asked to pay the full amount upfront. A reasonable schedule ties payment to completed work, not a promise of future work.
• A straight answer on warranty coverage. Manufacturer warranties on materials and a contractor's workmanship warranty are two different things — ask what's covered, for how long, and who you'd actually call if something goes wrong.

Take your time on this step. The roof going on your house should outlast the relationship you have with the crew installing it by decades — get the vetting right before the tear-off starts.

The Installation Process

A full replacement generally follows the same sequence no matter the material:

1. Tear-off. The existing roof — shingles, underlayment, flashing — is stripped down to bare decking. This is the point where hidden problems (rotted decking, prior water damage, old animal nests) actually become visible, which is exactly why roofing over an old layer instead of tearing off hides issues rather than solving them.
2. Decking inspection and repair. Any damaged or rotted decking gets replaced before anything new goes down. Skipping this step to save money is the single most common shortcut behind roofs that fail well before their expected lifespan.
3. Underlayment and ice-and-water shield. A synthetic underlayment goes down across the whole roof, with additional ice-and-water membrane in valleys, around penetrations, and along eaves — the parts of a roof most prone to water intrusion.
4. Flashing, starter strips, and the roofing material itself. New flashing around chimneys, vents, and skylights, then the shingles, metal panels, or tile go on according to the manufacturer's installation spec — not a generic approach applied to every material the same way.
5. Ridge caps, ventilation tie-in, and final inspection. The ridge is capped, ventilation components are connected and verified functional (not just installed), and the completed roof gets a final walk-through before cleanup.
6. Cleanup and haul-away. Old material and debris removed from the property, yard and gutters checked for stray nails.

A straightforward tear-off and reshingle on an average home takes one to two days. Larger roofs, steeper pitches, or added complexity like multiple valleys or skylights can extend that to three or four days.

Permits and Warranties

Most municipalities require a permit for a full roof replacement, and a reputable contractor pulls it as part of the job rather than leaving it to you — this matters because unpermitted roof work can complicate a future home sale or insurance claim. On warranties, expect two separate things: a manufacturer's warranty covering material defects, and a workmanship warranty from the contractor covering their installation. The two aren't interchangeable, and a "lifetime" material warranty is typically prorated after the first several years and covers materials only, not labor — read what's actually covered before assuming a warranty means the roof is fully protected for its full lifespan.