• Roofs with a pitch from 3° to vertical
• Both renovations and new buildings
• Installation on the roof boarding or incompatible support
• Transformation, installation in sheets up to 13 m long, mechanical crimping

• Roofs with a pitch from 3° to vertical
• Classes of internal humidity load: 1 to 4.
• Both renovations and new buildings.

VMZINC, the choices

• Natural VMZINC, 5 pre-weathered VMZINC colours QUARTZ-ZINC®, ANTHRA-ZINC®, PIGMENTO® red, green, blue: 0.7 or 0.8 mm thick.
  
• 6 Bilacquered VMZINC colours: 0.7 mm thick.

Characteristics of this technique

• VMZINC is installed on the roof boarding.
• A 40 mm continuous air gap must be left clear beneath the roof boarding, on all the roof pitches.
• Continuous ventilation openings are made at the top and bottom.
• In order to keep the integrity of the roof, it is recommended to install a breather membrane on the cold side of the insulation and a vapour control layer adapted to the internal humidity load of the building, on the warm side of the insulation.

Structure

• Clean and dry 100 to 150 mm wide, 18 or 24 mm thick softwood boarding, according to the rafter centres.
• Any wood treatment products (fungicides, insecticides) must be dry and completely neutral in relation to VMZINC.
• The roof boards are fixed perpendicular to the direction of the pitch leaving a 3 to 5 mm gap between them.
  They are securely fixed to the structure.
• Maximum difference in height of 1 mm between roof boards.
  The deflection measured under a rigid 600 mm long straight edge cannot exceed 2 mm in all directions.
• The roof board nails are countersunk in order to avoid any contact with the VMZINC.
• In case of incompatible support (e.g. plywood), one should use only VMZINC PLUS.