Every time Denver gets hit with a major hail storm, I watch the same thing happen. Homeowners call their insurance company, get an adjuster out, and then call a roofer. The roofer says “get Class 4 impact, it’s the best.” The agent says “yes, do that.” And everyone moves on.
Nobody runs the math. Nobody asks what the roof actually costs you over 10 or 30 years. Nobody asks whether a smarter choice might save you tens of thousands of dollars or generate a better return on that capital than almost anything else you could do with it.
That’s the gap. And in Denver’s hail market right now, that gap is getting expensive.
“A good agent tells you to get an impact rated roof. A great agent builds a financial model for you.”
The Deductible Problem Nobody Is Talking About
Carriers are moving away from flat deductibles and toward percentage-based deductibles tied to your home’s replacement cost value. We’re seeing 1% today, and some policies are already pushing toward 5%. On a $700,000 replacement cost home, here’s what that actually means when hail hits.
That’s what changes the math on which roof you choose.
1–5%
Average Denver hail cycle between major events
5–7 yrs
Range of deductibles now being quoted on new CO policies
20%+
Typical premium discount for impact-rated roofing
Three Options. Very Different Outcomes.
When you’re replacing a roof in Denver, you have three real choices. Most conversations only compare two. Here’s the honest breakdown of all three, including the one most people don’t seriously consider.
Avoid
Standard Asphalt
No impact rating. Cheapest install. But you pay full base premium every year with no discount, and absorb full replacement cost plus deductible every hail cycle. Looks smart on day one. Worst financial outcome over any meaningful hold period.
Smart Money Move
Class 4 Impact Asphalt
The right call for most Denver homeowners. Earns a meaningful insurance discount, costs only modestly more than standard, and the IRR on that upgrade is exceptional. Still gets replaced on the hail cycle, but the math works well for most hold periods.
Lifetime Hold
Stone Coated Metal
Significantly higher upfront cost. But it’s a lifetime roof that survives hail without replacement. For long-hold rentals and owner-occupants planning to stay, the 20-year math is compelling. Not the default answer, but the right one for the right situation.
Understanding the Math: NPV and IRR in Plain English
Before I show you the numbers, two quick concepts that make the analysis actually useful. You don’t need a finance background for either of these.
Net Present Value (NPV)
A dollar saved in year 20 is worth less than a dollar saved today, because that dollar today could have grown somewhere else in the meantime. NPV adjusts all future spending back to today’s dollars so you can make an honest comparison between a cheap roof now and an expensive roof that never needs replacing. Less negative NPV is better. It means you gave up less real purchasing power over the hold period.
Internal Rate of Return (IRR)
If metal costs $15,000 more than standard asphalt, but saves you money every year through lower premiums and avoided replacements, IRR tells you the annualized return you earned on that extra $15,000. We use 10% as the benchmark because that’s roughly what the S&P 500 has returned historically. If your roof decision can’t beat 10%, that capital probably works harder elsewhere. If it can, the upgrade pays.
Run Your Own Numbers
The defaults below are set to real Denver numbers based on current market conditions. Your actual premium, deductible, and install costs may vary. Plug in your own numbers and see what the math says for your specific property.
30-Year Roof Investment Analyzer
| Year | Std annual | C4 annual | Metal annual | Std cumul. | C4 cumul. | Metal cumul. |
|---|---|---|---|---|---|---|
| Yr 0 | ($13,500) | ($15,000) | ($30,000) | ($13,500) | ($15,000) | ($30,000) |
| Yr 1 | ($3,000) | ($2,400) | ($2,400) | ($16,500) | ($17,400) | ($32,400) |
| Yr 3 | ($3,000) | ($2,400) | ($2,400) | ($22,500) | ($22,200) | ($37,200) |
| Yr 5 | ($3,000) | ($2,400) | ($2,400) | ($28,500) | ($27,000) | ($42,000) |
| Yr 7 ⚡ | ($27,765) | ($29,139) | ($2,400) | ($59,265) | ($58,539) | ($46,800) |
| Yr 10 | ($3,000) | ($2,400) | ($2,400) | ($68,265) | ($65,739) | ($54,000) |
| Yr 14 ⚡ | ($33,378) | ($35,375) | ($2,400) | ($110,643) | ($108,314) | ($63,600) |
| Yr 21 ⚡ | ($40,763) | ($43,582) | ($2,400) | ($169,406) | ($166,296) | ($80,400) |
| Yr 25 | ($3,000) | ($2,400) | ($2,400) | ($181,406) | ($175,896) | ($90,000) |
| Yr 30 | ($3,000) | ($2,400) | ($2,400) | ($243,889) | ($239,876) | ($102,000) |
Stone coated metal wins the 30-year hold in NPV terms, saving $18,260 vs. standard asphalt and $16,574 vs. Class 4. IRR on the metal upgrade vs. standard: 17.4%. Metal's cumulative position crosses Class 4 around year 7 on a nominal cash basis.
⚡ = hail cycle year. Asphalt takes a full replacement plus deductible hit. Metal keeps running.
Why I Build Tools Instead of Just Giving Opinions
I’ve been doing this long enough to know that opinions are cheap in real estate. Every agent has one. What most agents don’t have is the engineering background to build a financial model that actually tests the opinion.
| Your situation | Right call | Why |
|---|---|---|
| Selling in under 5 years | Class 4 asphalt | Get the discount, pocket the difference vs. metal, let the next owner decide. Metal premium doesn’t pay back in a short hold. |
| Owner-occupant, 10-year hold | Class 4 asphalt | Strong IRR on the upgrade from standard. Right-sized for the hold period. Metal math starts working harder past 15 years. |
| Owner-occupant, 20+ year hold | NPV advantage over Class 4 grows significantly at long horizons. You also avoid a replacement event mid-hold and have a strong resale story. | |
| Rental property, lifetime hold | One install, done forever. No reroofing mid-tenancy, no adjuster, no contractor scheduling around a tenant. The operational simplicity alone justifies it. | |
| Rental, shorter hold | Class 4 asphalt | Meets carrier requirements, earns the discount, capital difference deploys better elsewhere at this time horizon. |
| Any property, any hold | Never standard asphalt | Full premium, no discount, full replacement cost every hail cycle. The $1,500 install savings evaporates before year two. There is no scenario where this is the right call in Denver. |
Why I Build Tools Instead of Just Giving Opinions
I’ve been doing this long enough to know that opinions are cheap in real estate. Every agent has one. What most agents don’t have is the engineering background to build a financial model that actually tests the opinion.
Want the Analysis Done on Your Property?
Whether you’re replacing a roof, evaluating a rental acquisition, or deciding if Denver makes sense for your next move, I’ll walk you through the actual numbers. Not a generic recommendation. Not a gut feeling. The math.
Dan Strawn
Broker Associate and Relocation Expert at Real Group Denver. Denver native with an engineering background and over a decade running a unique Rent First model for relocating clients. Builder of financial tools that help buyers, sellers, and investors make smarter decisions in the Denver market.
CALL US NOW