Answers to Your Most Common Questions

Cost

A. Because aluminium-zinc coated metal roofing is a top quality product, you can expect a new residential roof to cost about the same as a clay tile roof. In the longer term, homeowners see a significant financial benefit from a metal roof that, unlike tiled roofs, will not have to be substantially repaired for at least 30 years. A metal roof will also save you money on energy bills if properly insulated.

Environmental

A. A metal roof can withstand decades of abuse from extreme weather like high winds, heavy snow, hailstorms, and even fires. Under high wind conditions, a well installed metal roofing system will have high wind resistance well in excess of SANS requirements.

A. Lightning occurs from the highest object in an area, regardless of the material from which it is made. Metal roofing does not create nor attract lightning and if struck, is non-combustible.

A. A metal roof is completely non-combustible and provides great protection from external fires. Additionally, the low weight of our products minimises any cave-in threat which might occur with an interior house fire.

A. Metal does not lose impact resistance with age – unlike most other products which become more susceptible to damage with each passing year. In the event of an especially severe storm, even if an indentation does occur, a metal roof will be as watertight as before.

A. Pre-painted metal roofing in the light colour range together with low thermal mass, means that it cools down quickly after a long hot summer day, providing cooler interiors. Conversely during the winter a highly insulated roof system responds quickly to retain heat within the structure and provide immediate comfort.

A. A metal roofing system is a ‘green roof’ – it is made from material with a recycled content of up to 60% and its long service life guarantees sustainability. Add in energy efficiency and the ability to be installed over most existing roofs (avoiding landfill disposal of old materials) and you have what is likely the most environmentally-friendly roof available to homeowners!

How to Choose the Right Roof for My Home/Building?

A. We will work closely with you to choose the best roof for the purpose. One of the great things about metal roofing is the wide variety of products available. Our team is here to assist you!

A. The world’s most modern and widely used steel coating incorporates a mix of zinc and aluminium which work in harmony to provide optimal coating protection for the steel core. Global research has established that the performance of aluminium-zinc coated steel offers a service life at least 4 times longer than that of an equivalent zinc galvanised sheet of the same coating thickness in the same application.

A. Factory pre-painted metal roofing retains its good looks and durability for decades, because it is manufactured under factory controlled conditions providing high quality finishes which are self-cleaning in the rain, antibacterial and antifungal, and have high thermal reflectance for better interior comfort.

Installation

A. For optimal performance, the service life warranty of your fasteners must match the service life warranty of the sheeting being used. Aluminium roof sheeting: use ONLY stainless steel fasteners.

A. Despite the advances in modern day external waterproofing products, the harmful rays of the sun will eventually play havoc with their efficacy. These types of products, albeit very effective, should ideally be protected from prolonged exposure to the sun, so a metal flashing becomes the obvious solution.

A. The “clicking” of a metal roof is mostly due to thermal expansion and contraction, and is difficult to silence without insulation. When installed with a quality insulation, you can also silence the noise from rain, hail and bad weather as well – if not better – than that of any other roofing material.

A. A metal roof is, on average, 75% lighter than concrete tile and slate. This, coupled with the format of a sheet, and its high strength to weight ratio, means that even the substructure can be much lighter, using far less purlins / battens than a clay tile roof.

A. Yes. And metal roofs don’t lose their strength over time, making them as safe as when they are new. For heavy foot traffic we recommend walkways are installed over the roof – ask us for advice in advance of installation.

A. Cut edges and other areas where the base metal is exposed are protected by the coating. Due to a phenomenon called galvanic action, which is triggered when moisture is present, the coating sacrifices itself by offering itself for corrosion instead of the steel base. The use of clean paraffin may be applied carefully to the cut edge to further hinder corrosion.

A. Should the scratch or scuff marking be superficial it would be best left untouched. With deep scratches where the protective aluminium-zinc metal coating has been penetrated, replacement of the affected roof sheets should be considered.

A. We have a panel of approved installers that specialise in sheet metal roofing installations. Many will also offer you an installation warranty which gives you peace of mind.

Service Life

A. We have a panel of approved installers that specialise in sheet metal roofing installations. Many will also offer you an installation warranty which gives you peace of mind. Smaller jobs can be certainly be taken on by the DIY handyman, but prior to commencing please feel free to call us and get advice and product information from our qualified staff.

A. Although metal roofing in itself is well protected from the elements, preventative maintenance is required to ensure optimal performance. This includes periodic inspections of the roof as well as regular washing down of pre-painted roofing with a hose pipe and plain water. Do not use hard brushes that will scratch the surface.

Questions You’ve Asked at Our Stores

A. Different metals have different rust resistance levels. Supa-Roof’s sheeting is produced from aluminium-zinc coated steel, which protects it against rust giving it a longer lifespan than common competitors in the same market.

A. Supa-Roof prides itself on partnering with the communities we operate in. Therefore, we can suggest approved delivery partners that can assist with delivery at a nominal fee.

A. It is largely dependent on the UV exposure per area. Typically lighter colours have a gloss retention of more than 50% after 10 years exposure, and darker colours have greater than 60% gloss retention over the same period.

A. The various colours all adds to the aesthetic appeal of the house, and gives the homeowner a variety of choice for that individual touch. There is no difference in cost between the standard colour range. The Supa Tile / Versatile product comes standard in a 0.5mm commercial grade thickness, which makes for an economical alternative to the 0.58mm of conventional coatings.

A. Versatile / Supa-Tile is produced from using aluminium-zinc technology. The coating has a 55% aluminium, 43% zinc and 1.5% silicon content, which greatly enhances the coatings’ performance when compared to conventional zinc. Continuous research and development and modern coating technology also make the product a cost-effective solution when compared to older technology used on conventional coatings.

A. Supa-Tile / Versatile is manufactured from lightweight steel, and allows for greater ease of handling and less transport risks, which directly impacts the cost of the product when compared to clay tiles.

A. The wider 825mm overall width of the sheet translates into an effective covering width of 740mm, which effectively allows for greater coverage per square metre, therefore decreasing cost. The 0.5mm has a guaranteed mPa yield strength, giving the profile a solid performance under imposed loads.

A. Simply put, screws with tested thread counts per inch suitable for timber construction will have much better hold-down capability. Tests have proven that 75mm wire nails have a much lower pull-out resistance when compared to threaded fasteners.

A. Timber that has been treated with known or unknown chemicals, may adversely react with the aluminium-zinc coating. Consult with our technical staff to make sure.

A. Yes, when correctly installed, the “foil” acts as a radiant barrier, reflecting most of the UV rays and heat that enters the roof cavity via convection.

A. Foil does not have measurable sound deafening qualities. Maybe opt for a PET (Polyester Blanket or rigid board insulation).

QUESTIONS OR COMPLIMENTS?

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