Five systems. One standard: the assembly matters more than the shingle.
Atrium's engineered roofing systems are built around how your roof will actually perform — impact class, material behavior, energy performance, or warranty program — not around a one-size-fits-all tier ladder.
Which system fits your house?
Not a price ladder. Not a prestige ladder. Five configurations for five different priorities.
Organizing principle: Class 3 impact baseline
Representative manufacturers: Owens Corning, GAF, or Malarkey
Warranty ceiling: Enhanced Owens Corning system warranty, available at Platinum Preferred standing, GAF Silver Pledge, or Malarkey Emerald Pro Warranty
The properly engineered standard without paying for an upgrade.
Organizing principle: Class 4 via backing-layer / mat technology
Representative manufacturers: Owens Corning, GAF, or Malarkey
Warranty ceiling: Enhanced Owens Corning system warranty, available at Platinum Preferred standing, GAF Silver Pledge, or Malarkey Emerald Pro Warranty
The highest documented UL 2218 impact rating for insurance or exposure reasons.
Organizing principle: Class 4 via SBS-modified rubberized asphalt
Representative manufacturers: GAF or Malarkey
Warranty ceiling: GAF Silver Pledge or Malarkey Emerald Pro Warranty
Class 4 through flexible, rubberized-asphalt engineering.
Organizing principle: Class 4 via TAMKO HailGuard hail-specific engineering
Representative manufacturers: TAMKO
Warranty ceiling: TAMKO MasterShield Enhanced Limited Warranty, available at TAMKO Pro Platinum standing
A manufacturer with a hail-specific warranty program.
Organizing principle: Thermal / energy performance
Representative manufacturers: Atlas or standing seam metal
Warranty ceiling: Atlas Signature Select Roofing System Limited Warranty, available at Pro Plus standing or metal-specific warranty terms
Cutting cooling costs with a reflective roof.
Pick by priority, not by tier
- Want the properly engineered standard without paying for an upgrade? FOUNDATION™ is the Class 3 baseline.
- Want the highest documented UL 2218 impact rating for insurance or exposure reasons? IMPACTSHIELD™ is Class 4 through backing-layer or mat construction.
- Want Class 4 through flexible, rubberized-asphalt engineering? STORMLOCK™ uses SBS-modified polymer asphalt to reach the same rating.
- Want a manufacturer with a hail-specific warranty program? LEGACY™ is built around TAMKO HailGuard and TAMKO Pro Platinum standing.
- Want to cut cooling costs with a reflective roof? THERMALGUARD™ is organized around thermal performance, not impact class.
All five systems share the same underlying assembly standard: enhanced same-manufacturer ridge caps, enhanced attic ventilation, and the same five-layer system described in “The system, not the shingle” on our roof replacement page. The system tier changes; the assembly discipline does not.
Every manufacturer warranty is registered in your name and delivered as part of the Power Package — the five documents every Atrium customer receives at closeout. The warranty ceilings above are explained in full on our brands and certifications page, because the tier a contractor holds with each manufacturer is what decides which warranty you can actually get.
Engineered roofing system FAQs
Let's spec the right system for your roof.
No pressure, no obligation. Calls answered 24/7 by Alex, our AI agent · talk to a real engineer, not a salesperson.