The three shingle choices
| 3-tab | Architectural (laminated) | Impact-resistant (Class 4) | |
|---|---|---|---|
| What it is | Single layer with cutouts forming 3 tabs; the least expensive shingle | Two layers laminated for a dimensional look; the most common shingle today | Shingles that pass the UL 2218 Class 4 impact test |
| Example warranty | GAF Royal Sovereign: 25-year limited; CertainTeed XT 25: 25-year limited | GAF Timberline HDZ: Lifetime limited; Owens Corning Duration: limited lifetime | Varies by product |
| Typical life (InterNACHI) | About 20 years | About 30 years | Not rated separately |
Sources: ARMA, CertainTeed, GAF Royal Sovereign, CertainTeed XT 25, GAF Timberline HDZ, Owens Corning Duration, InterNACHI. CertainTeed notes dimensional shingles are now the predominant shingle.
Class 4: what it means, and what it doesn't
In the UL 2218 test, a 2-inch steel ball is dropped from 20 feet onto the shingle twice in roughly the same spot; Class 4 shingles show no tearing, cracking or splitting on the back (Malarkey). FM 4473 tests with real ice balls instead (FM Approvals).
The catch: the Insurance Institute for Business & Home Safety (IBHS) found products labeled impact-resistant ranged from excellent to poor in its own hail testing (IBHS). IBHS now publishes hail ratings by product, and the FORTIFIED Roof hail supplement requires shingles rated Good or Excellent on that list (FORTIFIED).
Minnesota insurance discounts for FORTIFIED roofs
Minnesota law requires insurers to give a premium discount or rate reduction when an owner retrofits a home to meet the FORTIFIED standard with the hail supplement (Minn. Stat. 65A.298). The Department of Commerce's 2026 bulletin sets threshold discounts on the wind/hail portion of the premium: 35% for FORTIFIED Roof + Hail, 38% for Silver + Hail and 40% for Gold + Hail (MN Commerce Bulletin 2026-1). A FORTIFIED Roof needs more than shingles: wind-rated shingles, a sealed roof deck and ring-shank nails (FORTIFIED).
The state's Strengthen Minnesota Homes grant program is a limited pilot in a few counties and isn't taking applications from the general public right now (MN Commerce).
What Minnesota code requires on every roof
- Ice barrier. Minnesota's residential code marks ice barrier underlayment as required (Minn. R. 1309.0301). It runs from the eaves to at least 24 inches inside the exterior wall line, or 36 inches on steep roofs (8/12 and up) (MN Residential Code R905.1.2).
- Wind rating. Minnesota's design wind speed is 115 mph, and shingles must carry a matching wind classification (Minn. R. 1309.0301, R905.2.4.1).
- Layers. You can't add a new layer over a roof that already has two or more layers (R908.3.1.1). Full tear-off is the norm.
- Ventilation. Attics need net free ventilation of 1/150 of the attic area, or 1/300 under certain conditions (R806.2). GAF's warranty excludes damage from inadequate ventilation (GAF).
Cold-weather installs
Shingle sealant strips need warmth to bond. Owens Corning says shingles installed at or below 40°F may not seal until warmer weather, and calls for hand-sealing with roof cement dabs in the cold (Owens Corning). Late-fall Minnesota roofs get that extra step.
What it costs in the Twin Cities
Angi puts roof replacement in Minneapolis at $9,988 on average, typically $6,316 to $13,812, and says architectural shingle materials run $2–$5 per sq ft versus $2–$3 for 3-tab (Angi Minneapolis, Angi Minneapolis shingles). The 2025 Cost vs. Value report's larger benchmark, a full tear-off of a 30-square (about 3,000 sq ft) roof, comes to $31,900 in the Twin Cities (Cost vs. Value). Roof size, pitch and layers drive the difference.
If you're selling
New roofing is the third most common project agents recommend before selling (37%) and scored a perfect 10 on NAR's homeowner Joy Score (NAR 2025). In the Twin Cities, an asphalt roof replacement recouped 60.2% at resale (Cost vs. Value).
Where the money is best spent
- Architectural over 3-tab for a longer typical life and better warranties.
- Impact-resistant if hail is a concern, and check the IBHS rating, not just the Class 4 label.
- FORTIFIED if you want the Minnesota insurance discount: ask your insurer what it applies to before you build.
- Ventilation and ice barrier done right. They protect the roof and the warranty.