Protecting the VMZINC during installation
As a general rule please avoid walking on VMZINC after installation even if the zinc is protected by film. However, when necessary, it is advised that ladders designed for this purpose are used and security footwear suitable for use on a slippery surface worn. Please ensure that all safety rules on the worksite are complied with at all times and that a safety harness is used. For works being performed near to the VMZINC (plastering, jointing, cementing, etc) the VMZINC already installed must be protected. Furthermore, it must be ensured that this protection does not block the aeration of the upper surface of the VMZINC.
Normal use implies traffic reduced to a strict minimum for normal maintenance defined above and other work, such as: chimney sweeping, installation and servicing of aerials, etc. It is advisable to take all the precautions and useful provisions necessary so as not to cause: Any punching of the flat parts or deformation of the joints, roll capping, roof vents, etc. For this, it is advisable to install walkways; Any deterioration of the pre-weathered layer. In the case where technical equipment requiring frequent inspections (air conditioning, for example) is installed on the roof, certain adaptive arrangements such as walkways should be considered. During installation, maintenance, or use of roofing which contains skylights, or other accessories made of glass fiber reinforced polyester, care should be taken not to press directly on these materials. Scaffolding, platforms, planks or ladders should be used.
Expansion and contraction
All VMZINC systems and installation recommendations (link to 11 documentations), take into account the need for expansion and contraction. VMZINC's thermal expansion coefficient is 0.22mm per metre and per degree Celsius. During installation at an ambient temperature of 20°C, the temperature difference between 20°C and 80°C and 20°C and -30°C should be taken into account. For a panel measuring 10m in length: expansion to be provided for: 0.022mm x 10 x 60 or 13.2mm contraction to be provided for: 0.022mm x 10 x 50 or 11.0 mm.
Zinc can be used in all climates. However, to avoid micro-cracking when folding the Natural, pre-weathered QUARTZ-ZINC and ANTHRA-ZINC zinc the temperature, of the metal, must be at least 7°C. The PIGMENTO series must have a temperature of at least 10° C (temperature of the metal) before being bent or profiled. It should also be noted that the minimum panel bending radius for the Pigmento range is zinc thickness x 4. For other finishes the bending radius is zinc thickness x 2.
Installation of external elements
The following elements: parabolic antennas, lightning rods and solar panels are often installed on rooftops. To find a solution, you should think about the way in which a VMZINC roofing system operates and take into account its requirement to expand and extract.