Curtain wall back pans


Back pans are substructure components fabricated by cutting, bending, and welding metal sheets (aluminum or galvanized steel). 

The primary use of back pans is in curtain wall systems, where they are installed at the backside of the spandrel glass and opaque areas. In some applications, back pans are placed behind metal panels. 

Back pans provide excellent thermal and moisture protection while being fire retardant and sound-absorbing.



Back pans provide thermal and moisture protection.


In curtain wall systems, back pans are installed behind opaque sections of the wall.


  • Galvanized steel sheet thickness can be 20, 22, or 24 gauge (0.040”, 0.034”, 0.028”, respectively) 
  • Pan depth from 3/4“to 8”
  • Typically, the insulation material is semi-rigid mineral wool
  • Insulation is held in place with cup head weld pins (±2 p/sq.ft)
  • All corners are tabbed, spot-welded, and sealed
  • Insulation material: ROCKWOOL CURTAINROCK® series for insulation. These products are stone wool insulation boards designed for a variety of curtain wall systems. CURTAINROCK® is non-combustible and fire-resistant. It will not develop toxic smoke or promote flame spread when exposed directly to fire. CURTAINROCK® Series 40 and 80 features ROCKWOOL ROXUL SAFE™, which provides a comprehensive fire-stopping system that has been UL/ULC/Intertek tested and approved for perimeter fire containment systems. This insulation material has excellent acoustic properties and is dimensionally stable – maintaining thermal performance over its lifetime, even in rising and falling temperatures.


PROFELEZ fabricates various back pans in different shapes and sizes based on your requirements and curtain wall system.

The factors that affect the design and shape of back pans are: ​

  • The material used for production (aluminum or galvanized steel)
  • Material thickness
  • Insulation material (usually mineral wool)
  • Quantity of welded stiffeners used. Large back pans are generally reinforced with stiffeners to increase their stability
  • Panel depth (ranging from 3/4″ to 8″)