ROOFING SYSTEMS OVERVIEW
Four Systems. One Specialist Contractor.
AOD installs, replaces, and maintains all four primary commercial and government roofing system types — with the technical depth to specify the right system for your facility and the compliance infrastructure to execute it correctly.
TPO
Thermoplastic Polyolefin
Single-ply heat-welded. Reflective. Low-slope standard.
UFC 3-110-04 · BOP standard
EPDM
Ethylene Propylene Diene Monomer
Synthetic rubber. Extreme temp range. Complex geometry.
Federal corrections · Retrofit
STANDING SEAM
Structural Metal Roofing System
Concealed fastener. Longest service life. 40-70 year horizon.
Air Force · Army · New build
MOD-BIT
Modified Bitumen
Asphalt System
Two/three-ply.
Redundant waterproofing.
High-traffic capable.
BOP · Occupied facilities
| Facility Condition | AOD Recommends | Why |
|---|---|---|
| Low-slope flat roof, energy code requirements | TPO | Industry standard, reflective, UFC 3-110-04 compliant |
| Complex geometry, extreme temps, retrofit budget | EPDM | Flexible rubber handles irregular shapes and temperature extremes |
| Sloped roof, high-visibility, or new construction | Standing Seam Metal | 40-70yr service life, lowest lifecycle cost per year |
| Existing BUR, high foot traffic, occupied install | Modified Bitumen | Redundant waterproofing, phases well, excellent on occupied facilities |
| Water at walls, decks, or below grade | Waterproofing System | See Building Envelope services — different system type |