COLORBOND® Roofing Screws 12 x 50 Multifix - Timber or Steel


Colorbond® 12 x 50 Multifix Roofing Screws Class 4 - fastens into timber or steel. 

How many screws do I need to install a roofing sheet?

We recommend approximately five roofing fasteners per 1 metre sheet.

Don't forget your Hex head Socket drill bit.

Corrosion Protection Warranty Revolation B8 Class 4 - up to 30 years (Mild urban areas). 

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Purchase painted COLORBOND® Tek Roofing Screws 12 X 50 Multifix Class 4, Self drilling for fixing into timber and metal. 

These roofing screws are fitted with a washer, ensuring the screw will fit snugly against the roofing sheet, allowing for maximum fixing and a water tight seal.

Roof Zip 12 gauge x 50mm Class 4 Tek roofing screws for fixing into timber or steel. 

Don't forget your Hex head Socket drill bit.

How many screws do I need to install a roofing sheet?

We recommend approximately five roofing fasteners per 1 metre sheet.

Winds can create considerable forces on both the upper surface and the underside of metal roofs. To ensure roofs are secure, our 12 x 50 Class 4 screws are recommended for fixing pierced metal sheeting to timber or metal battens.  Self drilling hex head fasteners with neoprene sealing washers are manufactored from high tensile steel with Colorbond durable coatings.  Roofing screws should be driven through square with the surface of the sheeting to provide a complete seal around the screw hole.   

Please do not over tighten the Tek screws, as this can damage the sealing washer and roof sheeting. The ends of corrugated roofing and close pitched trapezoidal roofing sheets should be fixed through the side lap and every second crest after that.

Fixings are intermediate purlins or battens, for corrugated metal roofing should be through the side lap and the third and seventh corrugation from the side lap. For close pitch trapezoidal roofing sheets, fixings should be at every third rib.

A string line should be used to make out a straight line along the centre of the battens or purlins.

How to Maintain Energy Efficiency With Your Metal Roofing

When you’re shopping online for a new roof, your main concerns may be that it has to look good and that it has to last a long time. Of course, there is also the “small” detail of your roof being priced at an affordable rate. These things are all important when you choose your type of roofing. But you might be forgetting one other crucial factor: energy efficiency.

When it comes to a number of factors, metal wins over several other roofing materials, namely fire resistance, longevity, durability, speed and ease of installation, and energy efficiency. It might cost more initially but its multiple benefits, especially where your cooling and heating needs are concerned, will pay off in the long run.

Metal roofing will reflect heat from the sun, which then minimises midday heat gain. With minimised heat gain, you don’t end up overusing your air conditioner. And if you rely less on your cooling system, your utility bills will not be as costly.  

Solar reflectance is just one way your metal or iron roofing can help you achieve energy efficiency. 

One other way to keep your home comfortable through summer and winter is by having your metal roof painted. Painted metal roof surfaces can enhance the roof’s thermal performance by reducing exterior temperature. This then reduces the heat and cool load of your home. But you have to pick the right colour, which will depend on your location’s climate. 

Naturally, if your home is situated in an especially warm climate, you may want to get your metal roof surface painted in a light colour. A light-coloured roofing system will keep your home cool during a hot day. Meanwhile, a dark-coloured roofing system will keep a home located in a chilly climate warm and comfortable.

You can also place vents in strategic areas to allow the cool air to come in and the warm air to come out.  

Finally, another key aspect to maintaining an energy-efficient home with your iron roofing system is to have a well-insulated roof space. In cold weather, around 25 percent to 35 percent of your home’s heat is lost through the ceiling; the same percentage of heat gain occurs during hot weather. If your home is in the tropical part of the country, you may want to go with reflective foil insulation.

Incidentally, properly installed insulation can also reduce noise created by rain.


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