Check the delivery to make sure you have the right product, delivered in prime condition. If there is any concern about the condition of the product, the supplier should be contacted before installation commences.
Ensure all components needed to complete the installation, including fasteners and accessories, are onsite before commencing installation.
Set out a flat area and supporting dunnage to ensure sheets will not be damaged by site debris.
When unloading by crane, ensure the lifting boom has a spreader bar and that tightening strops do not damage sheet laps. Slings or strops should be nylon with leather sleeves to prevent fraying or cutting and damaging slings. Single slings and chains should not be used to lift packs of cladding.
When unloading by hand, lift each sheet off the stack without sliding over under sheets, as that may cause damage to the paint.
The person receiving the roof is responsible for identifying a safe and convenient landing point for the load, in association with the main contractor. The mobile or truck mounted crane operator has the duty of declining any loading instruction which he deems unsafe. Under no conditions should the load be traversed directly above any person
Bundles or packs of roof cladding must remain banded when being lifted by a crane.
They must be placed adjacent to the portal frame and not mid-span on the purlins. Bundles must be placed so that their weight is spread over the entire area of the roof and should be positioned with the laps in the direction of laying.
Workers receiving a bundle of roof cladding on the roof must have sufficient mobility to avoid the load, and use tag lines to control the swinging of the load while it is out of reach.
Close stacked sheets may deteriorate quickly if water enters the pack. This happens because the metal exposed to moisture without air forms bulky, unstable, and loosely adherent, hygroscopic compounds. See 4.10.7 Crevice Corrosion/Wet Storage Stain.
Water can infiltrate deeply into a bundle of close-stacked sheets. The extent and severity of wet storage stain is usually proportional to the time the sheeting has been wet, however, the time to onset can be very variable, and occur more rapidly in warm conditions.
Sheets can be dried by filleting sheets or cross-stacking them on a slope to allow water to drain and air to circulate between them. Only use a dry, well-ventilated environment for long-term storage.
A patchy visual appearance of the paint can also result from wet stack storage of pre-painted steel products. This is known as blooming.
Blooming results from water swelling the paint and flattening or suppressing gloss components. The gloss distortion is typically temporary and will dissipate with time, and exposure to heat/sunlight. This can be demonstrated by the application of boiling water to an affected surface bringing the appearance back to normal