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What profile should I use?

The pitch of the roof is the biggest deciding factor. There are numerous trains of thought on this issue and the decision is based on numerous technical factors. However a very good rule of thumb is the following:

1-5 Degree fall: Concealed fix sheeting i.e. Snaplok or Diamondek
5-8 Degree fall: IBR
8+ Degree fall: Corrugated

Will the cut edges of the sheets corrode?

These products are sometimes referred to as 'self-healing' because the zinc in the surrounding coating protects the newly exposed edge in the following way. In the presence of moisture, a reaction occurs between the zinc and the steel which results in galvanic protection of the exposed steel, thereby inhibiting corrosion. The degree of protection does depend on the thickness of the coating (amount of zinc) and this is taken into account when Building Standards are formulated.
When faced with a roof design which involves hips and ridges there will always be a significant amount of cutting that will need to be performed on site. We can merely cover the various techniques used in South Africa and offer the following guidelines when cutting roof sheeting:

(1) Nibbler: More suited to flatsheet material as opposed to profiled sheeting. Laborious and very slow. Produces cold slivers of steel with no heat damage.

(2)

Power shears: Not readily available in SA. Very costly. Offer extremely clean cut with no heat damage.

(3)

“Tin Snips”: More suited to flatsheet material as opposed to profiled sheeting. Extremely labour intensive and painstakingly slow.

(4)

Cold Cutting Steel Blades: Available from Youngman Roofing. Operated by circular saw. Offers incredibly clean cut with heavier chips of cold steel. Blade chips away material thus producing cold cut. Cost effective on medium to large sized projects.

(5)

Grinder Discs: Most commonly used method in SA. This abrasive form of cutting produces extremely hot filings and heat build-up. The resultant cut is usually slightly burred. Special precautions need to be taken when using this form of cutting:

  (a) Material should always be cut on the ground.
  (b) Colour side should face away from the approach of the blade. This prevents the filings being propelled against the colour coating.
  (c) Clean off all resultant filings from the material immediately after cutting.
  (d) Avoid sustained cutting in one area to prevent excessive heat build-up.
  (e) Attempt to always cut the end of the sheet which will be protected by an overlying flashing. Impossible at valleys!

Are steel roofs noisy in the rain?

Many people enjoy the sound of rain falling on their steel roof. For those who don't, rain noise can be reduced if a foil and glass fibre blanket is used as the insulation material. This foil and glass fibre insulation blanket is installed between the roof frame and the roof sheeting and it performs two jobs. It keeps your home cool in summer and warm in winter, and it also acts as a sound deadening device, by reducing the amount of noise transmitted through to the inside of your home.

Can colour material be installed upside down?

No. Performance of the product will be affected by the different film thickness and UV absorbance capabilities of the backing coat on roofing products, however, there are double sided products available for applications where the reverse side will be visible.

What is swarf and should it be removed?

Swarf is the term given to the steel debris arising from cutting or piercing operations, and mostly comprises of fine steel particles mixed with abrasive, however, in this context swarf may also be taken to include any other discarded steel objects such as rivet shanks, nails, screws and nuts, which may come in contact with the roof sheets.
Swarf particles, if left on the surface, will corrode and cause rust stains which will detract from the finished appearance of a project. These stains are often mistaken for early deterioration of the roofing and walling itself.

Won't a steel roof be hot?

No. In summer a lightweight roof made from steel causes less heat to be radiated into your home because it cools down faster at night. And in winter, the same steel roof, properly insulated, helps keep the heat inside. This can result in reduced cooling and heating costs.

 

 
 
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