Maintenance

Installation and Warranty

Installation of material must be completed according to VM ZINC's specifications and recommendations.

A Warranty will only be issued [by Umicore] for installations completed by VM ZINC recommended installers.

Please, consult the VM ZINC Sales team for further information.
 


Storage recommendations

In order to preserve the quality of zinc from VMZINC, the following recommendations should be strictly respected:

  • Sheets and coils must be stored in a well-ventilated, sheltered and dry warehouse, with a constant temperature so as to avoid condensation build-up.
  • Sheets and coils must be separated from the ground by a pallet, which allows sufficient air space for the correct ventilation of the products.
  • In order to avoid deformation of the metal, sheets must be stored flat on the pallet
  • When coils are shipped, they may be placed either on their horizontal axis or vertical axis, depending on the client's request. It is recommended that the coils be stored in their original packaging.

If coils are to be stacked due to lack of storage space, the following recommendations must be respected:

  • If the coils are delivered on their horizontal axis, the pallets must be stored in their original packaging, and preferably individually on separating racks;
  • If the coils are delivered on their vertical axis, the pallets may be stored on top of one another, up to a maximum of 4 pallets for reasons of stability

Storage time for sheets and coils must be as short as possible, especially on the building site. If the zinc is mishandled, folds or "bumps" can form. Cracks may occur in these places years later. Due to the effects of expansion and contraction, deep scratches can cause cracks either during forming or after installation.

 

 

Storage and ventilation

 

 

If there is no ventilation (poor storage, transportation or installation conditions), zinc hydroxide which is powdery, non-adhesive and non-protective, is formed. This phenomenon prevents the formation of the natural protective patina and the zinc corrodes more easily.

Handling Recommendations:

Avoid dropping the zinc sheets, coils, or formed pieces. Any blow, punch, or deformity to the zinc can cause folds or bumps in one or several of the sheets or coils. These deformities will damage the appearance of the zinc and may also damage the structural integrity of the zinc. Cracks may occur in these damaged places over time. Avoid dragging or sliding the sheets, coils, or formed pieces over rough surfaces. The rough surfaces may scratch or damage the zinc which will develop into cracks either during forming or after installation, due to the effects of expansion and contraction of the metal.

Ensure that the zinc is not handled in an area with great temperature variations. Temperature variations can cause condensation build-up, which in turn will cause zinc hydroxide (white rust) to form on the zinc. Keep in mind that Umicore warranty does not cover white rust.

When handling the zinc always wear gloves and long sleeved shirt. The acidic nature of perspiration will leave marks on the zinc surface that will heal over time but will remain visible for a while and could have an adverse effect on the appearance of the zinc.

 

 

VMZINC protection during installation

 

 

1) Before Installing VMZINC

The installer must ensure that: the structure is dry, clean and free of any rubbish (nails, leaves, vegetation, etc.). The structure must conform (flatness, compatibility, etc.) to the specifications.

VMZINC must be transported and stored in dry conditions and in a constant temperature in order to avoid the formation of white rust.

White rust forms on the surface of VMZINC when the latter comes in contact with humidity in the absence of carbon dioxide. In this case, the protective layer cannot form and white rust appears on the surface. Unlike the patina layer, white rust provides no protection and leaves unattractive, indelible marks on the roof or facade. Consequently, we do not recommend installing panels that have been attacked by white rust.

  • Installation Recommendations:

Even though zinc will form a natural protective barrier, precautions should be taken during installation of the zinc to ensure that no damage, deformities, or color variations occur. The installers of the zinc should always wear gloves and long sleeved shirt when handling the zinc. The acidic nature of perspiration will leave marks on the zinc surface that will heal over time but will remain visible for a while and could have an adverse effect on the appearance of the zinc immediately after installation.

  • Protective Film

The protective film shall be removed from zinc panels upon completion of an elevation, all at the same time. The protective film should remain on the zinc no longer than 60 days after the completion of installation. Make sure that other trades will not contaminate zinc panels after the film is removed with any other building materials, corrosives, cleaning products, etc.

  • Minimum pitch

A minimum slope of 3 degrees should be used on all surfaces, including parapets, copings and flashings to ensure that standing water doesn’t occur.

  • Cold Weather Installation

During installation in a cold atmosphere, zinc may become cold brittle. Zinc should not be colder than 7ºC or it may crack. Zinc installed in weather colder than 7ºC should be heated prior to working. Typical tricks of the trade are heated seamers or to keep the zinc under a heated blanket if installed in winter conditions.

2) Moving around on the VMZINC during and after installation on the roof

As a general rule, moving around on already installed VMZINC, is to be avoided even if the latter is protected by film. As stated in the section on crimping, it is preferable to crimp the panels as they are installed. This also avoids unnecessary traffic on the panels that have already been laid.

The VMZINC fitted should be protected during peripheral works (rough casting, tuck-pointing, rendering, etc). However, this protection must allow effective ventilation of the upper surface of the VMZINC.

  • Soldering Recommendations and Techniques:

Use 50/50 Lead/Tin Solder. The soldering iron should be an adjustable temperature soldering iron.

Please talk your local VM Zinc representative if you require further information about soldering.

  • Caulks and Sealants

Polyurethane caulks and sealants are compatible with zinc. Caulks or sealants with an acidic cure must be avoided as they will corrode the zinc.

The caulk or sealant must be able to sustain high temperatures for extended periods of time. The maximum temperature for QUARTZ-ZINC (80°C) and the maximum temperature for ANTHRA-ZINC is (90°C)

 

 

VMZINC Maintenance

 

 

  • Dirt

If dirt accumulates on the zinc during the installation process, it should be gently removed with a clean/dry cloth or with warm water and mild soap. Do not use cleaning products to remove dirt.

Please consult with our Sales Team for cleaning procedures.

  • Grease and oily marks

In case of grease or oily marks, use acetone to remove them. Acetone is a volatile product. So please: Wait for good weather, the zinc panels have to be perfectly dry and cool – don't wait for hot temperatures as heat is not good with acetone - Clean the whole panel with a very clean cotton cloth - Don't scratch the zinc.

  • Scratches

If a scratch appears during the installation process, you should reassure the client that the self-healing patina will minimise the effects of the scratch over time. If the scratch is especially deep or wide then the panel may need to be replaced. Generally, scratches are expected and are self-correcting.

  • Fingerprints

Fingerprinting can be noticeable on wall applications. Because of the “self-healing” nature of zinc, fingerprints will be obscured by the formation of the patina over time. To remove them quickly, use mineral oil available from Umicore Building Products. Some mineral oils may react adversely to the zinc so be sure to use only VMZINC specified mineral oil.

  • Salt Deposits

Zinc has been successfully used in marine environments for several decades.

In some marine climates, the salt in the air or water reacts with zinc to form zinc oxychloride, which has a whitish appearance. This white residue will normally be washed away by rainfall. However, in drier marine environments, it may remain on the surface.

Salt deposits will tend to develop near the shore on zinc soffits and other protected areas of a building such as but not limited to eave flashing, gutter underside etc…; water naturally condenses and then evaporates from zinc surfaces leaving some salts. Spray also contributes to this condition. While salt deposits are not harmful to the zinc, white marks appear over time. This is a natural occurrence and Umicore Australia cannot be held responsible for the appearance of salt deposits on zinc surfaces.

We do not recommend installing ANTHRA-ZINC in coastal environments. Umicore cannot be held responsible for salt deposits. Contact VM ZINC for further information.

If you are planning to install VMZINC on the sea front; please, consult with our Sales Team.

  • Colour variations

Zinc is a natural material. Slight colour variations between panels are common and expected.

However, the colour difference will be minimized over time by the continuous formation of the protective patina. Patina formation will vary depending on the location of the building and weather conditions.

Color variations in QUARTZ-ZINC should not present a problem in the long run when the material is exposed to the atmosphere. The patina process will form a uniform color throughout the continuous zinc plan over time. This patina formation takes on average between 2 to 5 years (except in dry climates where it takes longer).

To ensure a consistent finish we recommend profiling and installing the components of a new project using coils from a same batch.

  • Flatness

A distinctive advantage of zinc is its malleability. The inherent softness of the material and its ductility allow it to be shaped into almost any form. Some waviness especially with low thickness may occur and can be more apparent during certain times of the day, based upon the angle at which the sunlight hits the cladding or the roof. This is the intrinsic characteristic of the zinc and is part of the aesthetic appearance of the material.