Class 4 impact-resistant shingles in Fort Collins

What Class 4 actually means

The rating comes from UL 2218, a test in which a two-inch steel ball is dropped from 20 feet onto the shingle — twice in the same spot — and the shingle's back is checked for cracks. Pass and it's Class 4, the highest rating. A two-inch steel ball hits harder than most two-inch hail, which is about the largest Fort Collins sees in a typical summer.

Class 4 shingles get there one of two ways: a polymer-modified (SBS) asphalt that stays flexible and absorbs the hit, or a reinforced fiberglass mat that resists cracking. The SBS type — Malarkey Vista and Legacy, Owens Corning Duration Flex, CertainTeed NorthGate — also handles the freeze-thaw and UV of this elevation better than standard asphalt, which is why they tend to last longer here even in years with no hail at all.

What the upgrade costs

Expect Class 4 shingles, Fort Collins or elsewhere on the Front Range, to run $40–$90 per square more than standard architectural. On a 28-square two-story that is $1,100–$2,500 on top of the replacement. Nothing else about the job changes — same tear-off, same underlayment, same ice-and-water membrane, same permit — so a typical 2,000 sq ft two-story runs about $13,000–$22,500 in Class 4 against $12,000–$20,000 in standard architectural. The cost page shows the numbers by house size.

The insurance discount

Many carriers offer a premium credit for a documented Class 4 roof, and some add a cosmetic damage exclusion — ask your agent about both before you choose. The size of the credit varies by carrier and policy, so get the actual number from your agent before you pick the shingle, and weigh it against the upgrade cost above.

To get it you usually need the manufacturer's Class 4 certification for the specific shingle line and a completed installation form, which the installing roofer supplies; your agent files it.

The catch: cosmetic damage exclusions

Here's the fine print nobody mentions at the door. When some insurers grant the Class 4 credit, they add a cosmetic damage exclusion to the policy: hail that dents or marks the roof without affecting its function isn't covered. On a Class 4 roof that is a fair trade most of the time, because the shingle isn't going to fail from a surface mark. But it means you need to read the endorsement and understand that a hail-scuffed Class 4 roof that still sheds water is yours to live with, not a claim. Ask your agent to explain the endorsement before you accept it.

Where Class 4 makes the most sense

• Any roof paid for by an insurance claim. If you're replacing a hail-totaled roof anyway, the upgrade is small money and the next storm is the one you're protecting against. Some insurers will pay the Class 4 upgrade cost on a claim; ask.
• Homes on the east side of town — Rigden Farm, Bucking Horse, Maple Hill, out toward Timnath and Windsor — where the cells that build over the foothills have grown to full size by the time they arrive.
• Anyone staying put five years or more. Any premium credit and the avoided deductibles add up.
• HOAs that require it. Some newer subdivisions along the Harmony and Timberline corridors write Class 4 into their covenants.

When it makes less sense

If you're selling in a year, the buyer gets the benefit and you pay for it — though a documented Class 4 roof is a line in the listing that Larimer County buyers understand. And if your insurer offers no credit, the case rests on avoided deductibles and longer life alone, which is still a decent case in this climate but not a slam dunk.

Metal as the other Class 4 option

Standing-seam steel is also Class 4 rated, and it doesn't bruise at all. It costs two to three times what shingles do and it will show cosmetic dents from very large hail, which is where that exclusion really bites. On a house you'll keep for 20 years, ask for both prices side by side. See roof replacement for what's under either one, and the post on architectural versus 3-tab shingles for how the shingle tiers compare.

How to make sure you're getting a Class 4 roof

The rating belongs to a specific product line, so the paperwork matters more than the sales pitch.

1. The quote names the line. Not "impact-resistant shingles" but the manufacturer and product, with the UL 2218 Class 4 rating stated.
2. The wrappers match. On delivery day, photograph a bundle wrapper. The rating is printed on it.
3. You get the certificate. Ask for the manufacturer's Class 4 documentation and the installation form your agent needs, and keep copies.
4. The rest of the roof matches the shingle. Ridge caps and starter strips from the same system, six nails per shingle, and the membrane at the eaves and valleys.

Questions to ask your agent first

• Is there a premium credit for a documented Class 4 roof, and how much is it on my policy, in dollars?
• Does accepting it add a cosmetic damage exclusion?
• What paperwork do you need, and by when?
• If the roof is a claim, will the policy pay any part of the upgrade?

Living with an impact-resistant roof

An impact-resistant roof still needs looking after. After a big storm, walk the yard for debris and check the gutters and vents for dents, just as you would with any roof. If the soft metals took a beating, have the roof looked at. A Class 4 rating makes damage less likely, not impossible. Keep the gutters clear so meltwater drains, and don't pressure-wash the shingles — it strips granules from any asphalt roof. When you sell, put the certificate and install date in the listing packet. Buyers and their insurers will ask.