How to ensure that you maximize the life of your roof when installing ECMIL Roof Sheeting
Observe the following Do’s and Don’ts.
Cutting should not be carried out on top of other roof sheets.
Lead and copper are not compatible with COLORBOND steel or ZINCALUME steel products.
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.
Do not store sheet packs out in open weather.
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.
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.
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.
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.
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.
Do not leave metal articles on the roof.
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.
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 neutral cure silicone rubber sealants which offer the following:
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.
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.
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.
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.
Roll-forming and bending of COLORBOND steel should preferably be done without the use of a lubricant.
Always use coated steel purlins and girts to avoid any ZINCALUME steel or COLORBOND steel contact with bare steel or treated timber.
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.
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).
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.
Ensure that brick work that sits above / adjacent to a section of roof is cleaned before roof and gutter installation.
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