Dark Preweathered Zinc
Zinc Roofing Today
Out of all the traditional metal roofing materials available, zinc remains the most well-known, interesting and widely used material. Commonly considered a contemporary metal roofing material, zinc has in fact been installed on roofs since the early 19th century. Today’s Zinc-Titanium alloy is malleable, has an excellent appearance, is cost effective and has a relatively long life with low maintenance.
Zinc is available in natural form, preweathered, dark preweathered and with pigmented colours.
Natural zinc has an initial shiny metallic appearance that develops a patina over time. This very patina actually becomes a protective layer for the zinc, giving a long life product.
Preweathered zinc is chemically treated to give various matt colour options, some representative of weathered natural zinc. The preweathered zinc will take on its natural patina over time, again protecting the zinc from further corrosion.
Coloured zinc is created by adding pigments to a durable protective coating, giving the appearance of colour but still revealing the grained preweathered zinc surface.
Zinc and the Environment
Zinc is one of the most reliable metals that has been used as a building material for centuries. This includes zinc gutters, rainwater drainage systems, roof covering and wall cladding. With a lifespan of 75+ years, zinc is not only an aesthetic choice but nowadays also a sustainable choice. In addition to a long service life, more than 95% is collected and recycled again after use. It therefore answers the circular economy. There are few building materials whose overall environmental balance is as positive as for zinc.
AFP (Anti Finger Print) Coating
An AFP coating is a pre-requisite for a good quality installation. All our preweathered zincs have an organic AFP coating which protects the zinc from potential unsightly marks during installation.
Protective Backing or Not?
Zinc is sometimes specified with a protective backing, however this protective backing can also fail if the substrate isn't correct. We therefore advise to use standard zinc with a structured underlay ISO-Mat Metal® and to ensure the correct substrate build-up with an effective vapour barrier in place.
For a ventilated cladding situation, ISO-Matt Pro® underlay is acceptable.
Zinc Roofing Substrates
Zinc Coil Quality
Although a certain amount of 'oil canning' (undulations) is inevitable when forming zinc, it is imperative that the zinc is of a good, unmarked quality before forming. All our metals are quality checked during recoiling.
Any quality zinc Manufacturer will now offer a minimum 30 year warranty, subject to certain exclusions. All our zincs have a standard 30 year warranty.
Zinc Fire Safety
A roof or façade with a zinc covering, fitted in accordance with the applicable design and installation guidelines (BRL 5212), does not pose a fire risk in accordance with NEN 6063. Zinc products fall under Euroclass A1 of NEN-EN 13501-1. Euroclass A1 is the “non-combustible” class.