Insulated Sectional Steel Doors ThermoMark™ Models 5150/5200 and 5155/5255

Insulated Sectional Steel Doors ThermoMark™ Models 5150/5200 and 5155/5255

ThermoMark™ sectional steel commercial doors made to accommodate RVs, large trucks, heavy equipment, boats, trailers, and garage-based shops. Models 5150 and 5200 are the ideal choices if you’re looking for a commercial door that has a combination of strength and insulation but is also aesthetically appealing without the traditional industrial look. Then, Models 5155 and 5255 are insulated commercial sectional doors ideal for projects requiring something more rugged and durable, with excellent thermal insulation qualities. ThermoMark™ 5,000 Series is ideal for commercial or industrial applications where durability and aesthetics are required.

Ideal Applications Include:

Manufacturing Plants   |   Production Facilities   |  Loading Docks    |    Storage Facilities    |      Commercial Buildings    |    Industrial Facilities    |    Drive-Thru Bays    |    Truck Bays    |    Vehicular Storage         


Standard ConstructionModel 5150Model 5200Model 5155Model 5255
Max. Width20'2"26'2"20'2"26'2"
Max. Height20'1"20'1"20'1"20'1"
U-factor*  .
Sectional Thickness1 3/8"
1 7/8"
1 7/8"
3 layer"
Thermal BreakYesYesYesYes
Spring Cycle10,00010,00010,00010,000
Exterior/Interior SurfaceEmbossed Wood Grain or Stucco Embossed / PinstripeEmbossed Wood Grain or Stucco Embossed / PinstripeStucco Embossed / FlushStucco Embossed / Flush
Exterior SurfaceStucco Embossed / PinstripeStucco Embossed / PinstripeStucco Embossed / PinstripeStucco Embossed / Flush
Exterior Steel0.015" (.35mm)0.015" (.38mm)0.015" (.35mm)0.015" (.35mm)
Panel DesignsYes (6)Yes (5)NoNo
Air infiltration
0.23 cfm/ft2 at 25 mph 0.23 cfm/ft2at 15 mph 0.23 cfm/ft² at 25mph (4.20 m3/hr/m2 at 24 kmph) 0.17 cfm/ft2at 15 mph
Sound Transmission
Class 20Class 20Class 20Class 20
Wind Load (optional)Yes***Yes***NoNo

*U-factor is independently tested and verified per ANSI/DASMA 105 using solid doors and specific product sizes.
**Wayne Dalton uses a calculated door section R-value for our insulated doors.
***FBC, TDI, Miami Dade approved wind load reinforcement is available for hurricane-prone areas



Low Maintenance / Durable Design

  • Factory finished interior and exterior hot-dipped, galvanized skins make installation easier, add life to the door, and provide greater durability
  • Steel end caps and hardware plates add commercial durability and longevity
  • Bulb-shaped bottom seal remains flexible even in extreme cold to help keep extreme weather conditions outside
  • Stucco steel back panels provide appealing aesthetics
  • The two-coat, baked-on polyester finish makes the surface virtually maintenance-free

Thermal Performance

  • Thermal break helps ensure year-round energy efficiency
  • The CFC- and HCFC-free polyurethane foamed-in-place insulation core is securely bonded to hot-dipped galvanized inner and outer skins to create a door that is significantly more efficient than conventional insulated steel doors
  • Sound-absorbing insulation makes door quieter in operation; reduces wind rattling


  • 10-Year limited warranty against delamination, cracking, splitting or deterioration due to rust-through
dasma thermal performance verification program details