A Class 4 impact rating is useful evidence about a roofing product's performance in a particular test. It cannot tell you that your finished roof will be hail-proof, what your insurance company will pay after a storm, or whether every part of the proposed roof system suits your home.
If you are comparing impact-resistant shingles for a Minnesota roof replacement, begin with the exact products in the estimates. Then compare the testing, the complete installation proposal, and any written insurance response.
1. The rating identifies a test result for a specific product
Ask the roofer which standard supports the advertised Class 4 rating and where you can verify it for the proposed shingle. “Impact-resistant” on a sales sheet is less precise than a product name paired with a recognized test classification.
UL Solutions explains that UL 2218 uses falling steel balls to evaluate impact resistance and assigns Classes 1 through 4. UL also distinguishes that certification from the additional performance testing developed with IBHS.
The document should match the actual product being quoted. Record the manufacturer, product line, classification, and source. If two proposals use different products, get the details for each; do not assume a manufacturer's entire catalog carries one rating. Keep the documentation with your final contract so it remains clear what you selected.
Avoid converting the laboratory result into a promise about a future Minnesota hailstorm. The test gives you a defined basis for comparison. It does not reproduce every possible storm or inspect the completed roof on your house.
You also need to decide what you value. Is your primary concern reducing vulnerability to hail impacts, limiting visible damage, choosing an appearance you like, or controlling the project cost? Write that priority down before comparing options. It helps the contractor explain the proposed upgrade in terms you can evaluate instead of repeating the product's label.
2. Additional testing can show differences that a shared class does not explain
Two products with the same advertised class may have additional published results worth reviewing. UL notes that its UL 2218 assessment does not account for all denting and granule-loss damage visible from the shingle surface. That is one reason to look beyond a shared label.
The IBHS shingle ratings compare tested products and report performance for dents, tears, and granule loss. Its impact-resistance protocol uses laboratory-made hailstones to assess relative performance. IBHS describes the protocol as a research and product-comparison tool, not a method for deciding insurance or legal claims.
Use the current results for the exact products under consideration, where available. Record the test year along with the result. If a product does not appear, mark that comparison “not available” rather than inventing a ranking or treating absence as proof of poor performance.
Ask the contractor to interpret any tradeoffs in the published results. A useful explanation names the result, connects it to your concern, and acknowledges what remains unknown. “This is the best shingle” gives you no way to check the recommendation.
Save the relevant product pages and identify which claimed advantages have documentation. If a proposal costs more, ask what specific product or installation difference accounts for that increase.
3. A shingle classification does not describe the entire roof proposal
Request an itemized description of the roof being offered. Where applicable, ask the contractor to identify the underlayment, ice barrier, flashing work, ventilation work, edge details, and treatment of existing decking. The estimate should make clear what is included, what is excluded, and what might change after tear-off.
For a Minnesota house with a history of winter leaks, add that history to the conversation. Do not assume an impact-resistant shingle selection resolves a separate ice-dam or attic-moisture concern. Ask who will investigate that concern and how the findings could affect the work being proposed.
Compare written installation and warranty documents separately from the impact classification. Ask what product defects the manufacturer warranty addresses, what workmanship coverage the contractor provides, and where weather-related exclusions appear. Have the company identify the applicable documents rather than relying on an informal description during a sales visit.
Use a short worksheet to keep the offers comparable:
| Item to verify | Proposal A | Proposal B |
|---|---|---|
| Exact shingle and published impact classification | ___ | ___ |
| Additional hail-test results, if available | ___ | ___ |
| Roof components and work included | ___ | ___ |
| Existing concerns requiring investigation | ___ | ___ |
| Written warranty documents supplied | ___ | ___ |
| Total installed price and exclusions | ___ | ___ |
If one proposal leaves a row blank, request the information before judging the difference in price. An incomplete proposal can look less expensive because you cannot yet see the same amount of work.
4. Insurance discounts and future claims require separate answers
Before you include an insurance discount in your budget, ask your agent or insurer about the exact product and your specific policy. Request the eligibility requirements, documentation needed, and any quoted premium change in writing. Treat an unconfirmed saving as zero in your purchasing comparison.
Also ask whether selecting the roof affects any roof-specific policy terms. You want to understand the policy you will have after the project, including applicable deductibles and restrictions, rather than discussing a discount in isolation. The Minnesota Department of Commerce's homeowners insurance guidance identifies deductibles, actual versus replacement coverage, and policy gaps as subjects homeowners should review.
Keep three amounts separate on your worksheet: the installed project price, the added cost of your chosen upgrade, and any insurer-confirmed annual premium difference. Do not count an assumed future claim payment as savings. You cannot know in advance whether a future event will damage the home or how a particular claim will be resolved.
Once the product comparison is clear, you can decide whether the additional cost fits your priorities. Some homeowners will place more weight on the published hail performance; others will need to revisit the scope or financing of the whole project.
To discuss roof options for your home, contact Committed 365 Roofing. Bring the exact products you are considering and ask for an explanation of the proposed roof system, supported product claims, and written project price.