For the older generation“decramastic tiles*” means a scallop-shaped metal tile roof coated with stone chip. The issues that were often attributed to the product have, by some, continued to be associated with the new generation of acrylic, stone chip, metal tiles manufactured today.

The reality is they are totally different products and processes.

The issue of stones coming off the Decramastic roof surface was brought to public attention in 1978 in the NZ program “Fair Go”. What the public was not made aware of was the product in dispute was 15 years old and already superseded by a superior product. Nor were they generally aware that the manufacturer was successful in bringing a defamation claim against the broadcasters for misleading and incorrect statements.

Unfortunately this television program meant the general population became concerned about chip loss on metal tile roofs. But in testimony to the protective nature of the product there are still many of these roofs in service today, 50 years later, that have or can be restored with modern technology.

The idea of the chip coating came from an Englishman, Ben Booth, who developed a process for coating steel sheet with Bitumen onto which sand or grit was applied to prevent the sheets sticking together when stacked. It has been suggested that this was also to reduce glare as a form of camouflage during the wartime period around 1940.

Metal tiles made using this basic coating process were made from the late 1950s on. The first tiles were made in 1957 after Lou Fisher acquired Martile from the Martins.

In 1976 AHI Roofing initiated a major research program with the then modern technology of acrylics. By 1980 the new acrylic based product had replaced the barrier system which used the old Bituminous emulsion. These metal tiles were marketed under the brand Decrabond and New Harveytile.

In 1989 the largest installers of steel roofing tiles in Auckland engaged an engineer and chemist to develop what was to become Metrotile.

Today there are numerous manufactures of pressed metal tiles; Gerard Roofing, Metrotile, Metalcraft Roofing and others. All use similar technology, with some variations in formulation, and none use bituminous products in their manufacture.

Today’s pressed metal tiles use ZINCALUME® as a base with an acrylic coat over laid with natural stone chip with a second coat of acrylic overglaze.

The stone chips used today are similar to the originals with some synthetically coloured chip blended to offer a wider choice of colour combinations.

The range of tile profiles offered in today’s market is extensive. From the traditional to low profile slate and shake products.

While there is some differences between the warranties offered by products and brands most offer a 50 year pro rata warranty.

Cooper Roofing are a proud Gerard Roofing certified roofer, and we offer the full range of Gerard Roof tiles.

Todays tiles are not Decramastic
Todays tiles are not Decramastic

Todays tiles are not Decramastic
Todays tiles are not Decramastic

Todays tiles are not Decramastic

For many people, choosing a roof is primarily about style, and in this respect, a modern, lightweight Gerard roof offers a myriad of different options to suit the architecture of all kinds.

But equally important is peace of mind. You want to feel confident that your roof will continue to protect your home and its precious contents even under the most extreme conditions imaginable.
Gerard roofs have been thoroughly proven over time right throughout New Zealand and in over 120 countries around the world.

Sustainable Roofing

Sustainability by definition is inherently broad. Generally, however, there is a commonly understood idea of sustainability – the capacity for continuance into the long term. Sustainability is a process, a journey without an end; continuous improvement is the end in itself.
A Gerard pressed steel roof is an environmentally friendly choice. It’s lighter than concrete or clay roofing, which means transportation is more energy-efficient. It requires less framing support, which saves resources. And it’s made from steel, which is endlessly recyclable.

Your home is where you put the most energy, where you want to be surrounded by comfort and safety. In other words, your home is where your heart lies. Find the Gerard Roof in the heart of this labyrinth.

A Gerard Roof is excellent compared to other steel products. The low noise impact is the result of textured, stone granules and smaller steel sheets pressed into tiles, which minimizes the sound transmission through to the house.

Longrun steel roofs allow sound to travel in waves along the full length of the sheets meaning that noise transmission into the home can be quite high. Gerard Roofs pressed steel tiles are short lengths of metal fitted together so sound is unable to travel and any rain impact noise dulls quickly.

Alpine tile roof, Millwater

Alpine tile roof, Millwater

Charcoal Alpine Tile, Millwater

Charcoal Alpine Tile, Millwater


A stunning new profile has been released onto the NZ market and the first roofs have been installed. This beautiful, sleek new look is on display on a roof in Millwater and we think its a winner!

The new ALPINE tile is available in a textured finish and is viewed above in a Charcoal colour, but it has a range of colours available.

This is a smart alternative to asphalt shingles or heavyweight slate roofing and with its attractive low profile it lends an almost flat look to your roof while still providing a long warranty and the trustworthy weathertightness of a Gerard Roof.

This one’s a beauty!

Contact us for more information on the Alpine tile or for a drive by address to view this roof.

A complex of Auckland units badly in need of a spruce up recently received some TLC from its owners in the form of a new roof and new cladding.

Cooper Roofing was contracted to remove the tired old roofing and install the new Gerard Corona Shake ‘Obsidian’ roofing system. This was done in stages, keeping the roofs watertight the entire time so the owners and tenants could remain living in the house throughout the reroofing process.

You need to ensure that your roof is ready and weather tight for the coming winter and now is the time to do it.

If you are in need of reroofing get in touch as soon as possible so we are able to get your job into our schedule and ensure your home is weathertight before the wet season arrives.

We can replace your longrun roof , your metal tile/ decramastic roof or even your concrete roof with a brand new fully warranted Gerard Roof.

Contact us now for a free inspection and a quote to take care of your roofs needs.

Even the birds will be cosy under a Gerard Roof with this Gerard mini tile roof….

A big challenge – well met by Cooper Roofing. Read on about installation of the Cladding at the Chrysalis Childcare Centre.

It’s unusual for Rooflink to re-visit a roofing project already featured. But the unique wall cladding on Avondales Chrysalis Chilcare Centre was created and installed by RANZ member Cooper Roofing Ltd – a fact not acknowledged in the article in the Autumn issue reproduced from SCOPE.

Contracted to builder Keola Homes, RANZ member Cooper Roofing put hours of effort into quoting the cladding of the centre to ensure all the plans specified requirements were covered. Being awarded the contract was both an exciting and alarming prospect.

Managing Director, Penny Alexander takes up the story:

“Dimond Rib 50 cladding was not a profile that we had worked with on a regular basis and the flashings required were different to most standard cladding requirements so it was a new challenge that we were keen to take on.

“The architects plans were very specific and we worked to their design for the most part. Not much had to be altered but each flashing detail on the plan was more of a guideline than something you could send to the flashing manufacturer. Each one had to be slightly different and measured to fit properly with the cladding profile and height of the building.

“The sheets were manufactured to our ordered lengths for the height of the building at each panel, with the minimal wastage achieved due mostly to planning on our part. The offcuts were not wastage, just split sheets as the cover of the sheets didnt fit in whole sheets on the panels so they were split lengthwise and the cut piece wient onto the next flat panel”

Cooper Roofing’s quote was created using Exact Roofing, a custom designed roof quoting software, drawn to scale and software helped calculate the exact requirements for materials and labour. The crescent drawings took some working out with 31 radiating grid lines to get the building drawn to scale accurately – plus the childcare centre slopes and is not flat.

Kevin Peri, the company’s skilled and experienced supervisor coordinated the project and multiple roofers worked on the installation, with Wayne Holland and Richard Alexander working closely with Kevin.

Adds Penny: “Being such a unique structure, the details were not standard and required close attention to ensure we were both following the architect’s direction and creating something which could physically be installed to the building.

“The architect’s vision of the joins to each flat panel crating the curved external walls was something we had not encountered before. This kept each junction between panels contained, tidy and allowed for expansion and contraction of the panels without buckling of the flashing material. Thermal expansion had to be catered for because the cladding was black.

“The building slopes from the high points of the crescent to the centre of the curve at the lowest point closest to the ground, so each panel – both on the internal and external curve had to be ordered to individual lengths for teh height of the buiding at that point The design width of the panels did not exactly fit the width of the cover of Dimond Rib 50, so the sheets needed to be trimmed down to fit the panels as required.

“Every flashing to each joint between panels had to be measured and orderd to the correct height and to meet the profile of the cladding at the point that it met the joint. The specified profile and the unique flashing designs – along with our skilled installers – have given an excellent effect to the finished building.”