Roof Fix Facts Sheet

How to ensure that you maximize the life of your roof when installing ECMIL Roof Sheeting
Observe the following Do’s and Don’ts.

Please click on each question to reveal the answer

Roofing Don'ts

Cutting Sheets on Site

Cutting should not be carried out on top of other roof sheets.

Compatibility

Lead and copper are not compatible with COLORBOND steel or ZINCALUME steel products.

Bending and Roll-forming

  • Do not use kerosene or distillate on COLORBOND steel as they soften the paint film.
  • Do not exceed the minimum bend radii as this could crack the protective film.

Roof Fixing Battens

Do not use copper/chrome/arsenic (CCA) treated timber battens as perforation of the roof sheet can occur. Separate CCA treated battens from roofing sheets with appropriate barrier such as insulation paper.

Care and Storage

Do not store sheet packs out in open weather.

Detergents & Cleaners

Never use abrasive or solvent type cleaners (turpentine, petrol, kerosene, paint thinners) on COLORBOND steel surfaces.

Never use wire brushes, steel wool, sponge scourers to clean the roof sheet.

Following Trades

Do not mount roof air conditioning units on CCA treated timber.  Also do not place CCA treated timber or green hardwood dunnage on roof sheets.

Surface damage

Touch up paint is not recommended to repair surface scratches on COLORBOND steel.  The different weathering pattern of touch up paint will lead to an inconsistent colour across the sheets’ surface.  It is recommended that damaged sheets be replaced.

If the COLORBOND steel sheet is only scratched back to the ZINCALUME steel coating, leave the scratch bare as the sacrificial properties of Zinc will produce an oxide to protect the surface from corrosion.

If the sheet is scratched back to the cold rolled metal base and the scratch is greater than 2mm wide, sacrificial protection will be reduced and those sheets should be replaced.

Fasteners and Accessories

Do not use galvanized steel ridge cap flashings or gutters with a ZINCALUME steel or COLORBOND steel roof. The galvanized steel will need to be replaced at an earlier interval (use ZINCALUME or COLORBOND steel).

Do not use stainless steel screws, galvanized washers, cadmium plated screws or other type of screw that doesn’t comply with AS 3356 Class three with  ZINCALUME steel or COLORBOND steel as this will lead to premature failure of the roof sheet.

Brick Cleaning

Do not allow brick cleaning fluids to spray onto or flow across sheeting and into gutters.  This can lead to early failure of the paint and corrosion of the metal.

Swarf Removal

Do not leave metal articles on the roof.

Use of Sealants

Do not use acetic acid based sealants, while being ideal for use with other materials they liberate aggressive by-products during curing which is detrimental to sheet steel. These often have a vinegar or ammonia smell.

Roofing Dos

Swarf Removal

Remove all metal scraps, pop rivet mandrels and excess fasteners from the roof at least daily to avoid rust stains.

When cleaning up after having installed roof sheets clean out the gutters, ensuring not to leave metal tailings.

 

 

Use of Sealants

Use neutral cure silicone rubber sealants which offer the following:

  • Good adhesion to the clean surface of roof sheeting.
  • Water resistance and are non-corrosive to the sheeting.
  • Resistance to extremes of heat and cold while retaining good flexibility.
  • Provide high resistance to ultra-violet rays (sunlight) and have a long service life.

Mineral turpentine is suitable for cleaning only the surfaces to be adhered and remove all residual solvent with a dry cloth.  While spirits such as Shell X-55 can also be used to clean the surfaces to be sealed.

Care and Storage

Material should be stored dry at all times therefore cover stack with a tarp and stack sheets or bundles clear of the ground to avoid material getting wet.

Should material get wet, unpack wet sheets to allow drying. Use a clean cloth to remove surface moisture, and stack in such a way that air circulation completes the drying process.

Fasteners and Accessories

All screws should have rubber sealing washers.  Rubber washers should be EPDM quality or the equivalent and be free of carbon fillers.

Buy fasteners that are as durable as the roof sheeting you have purchased and that comply with class AS 3566 Class 3, (AS3566 is a performance based standard that specifies a minimum coating thickness for fasteners to be used in benign (Class 1) to severe marine (Class 4) environments.

Cutting Sheets on Site

Use metal blades rather than carborundum discs/  angle grinders as they produce fewer damaging hot metal particles, leaving fewer burs on the cut sheet. BHP recommends the use of cold cutting saws such as the Makita 4130 unit with appropriate blade.

Bending and Roll-Forming

Roll-forming and bending of COLORBOND steel should preferably be done without the use of a lubricant.

Compatibility

Always use coated steel purlins and girts to avoid any ZINCALUME steel or COLORBOND steel contact with bare steel or treated timber.

Walking on Roof Sheeting

Clean soft-soled shoes should be worn. Dunlop Volley shoes are recommended for use when installing and inspecting roof sheets.

Keep weight evenly distributed over the soles of the feet as new sheets may be slippery.

Walk on purlin lines wherever possible.

Detergents & Cleaners

Only non-ionic detergent or “kitchen” detergent recommended for cleaning of roof sheets.  (A soft cloth, mop or soft nylon bristle brush may be used).

Following Trades

Pipes and other penetrations made from copper or lead must be post painted to prevent the deposition of metallic copper or lead ions upon the roof surface.  Failure to comply with this requirement will result in the accelerated corrosion of the roof sheet.

Any mortar / concrete should be removed immediately from the roof sheets.

Brick Cleaning

Ensure that brick work that sits above / adjacent to a section of roof is cleaned before roof and gutter installation.

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