Flat roofs and balconies

7.1.5Profiled metal decks

Profiled metal flat roofs and balconies shall form a satisfactory substrate for the waterproofing system.

Profiled metal flat roofs should:

  • be constructed to ensure they achieve the required strength and durability, and be checked for conformity with the design upon delivery
  • be suitably stored to prevent damage
  • comply with the manufacturer’s load and span tables and the relevant applied safety factor
  • resist loads in accordance with BS EN 1991-1-4 and be fixed in accordance with the manufacturer’s instructions
  • be galvanised steel to BS EN 10147 or aluminium to BS EN 485-2 and used in accordance with BS EN 1993-1-3
  • have a crown which is a minimum of 50% of the profile width (for bonded systems)
  • have a crown which is a minimum of 45% of the profile width (for mechanically fixed systems)
  • be side stitched to ensure it performs as a continuous plane layer (unless the manufacturer recommends otherwise)
  • be fixed and installed in accordance with the design and variations approved by the designer
  • be adequately protected from construction loads
  • be of suitable quality and finish before the waterproofing and insulation system is installed.