PR roof, ribbed panel, externally fixed.
steel panels, externally fixed to secondary framing
with self-drilling screws.
SR sandwich panel, CFC-free polyurethane core
panels with polyurethane core, externally fixed with
standing seam roof with hidden fasteners
seam roof system with "snap together" connections
at top of ribs.
Double skin roof systems
PR roof with auxiliary structure supporting external
PR panels or Astrotec panels. Thermal insulation placed
between the skins.