GUIDLINES
FIXING & MAINTENANCE
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> Distance between adjacent purlins should not exceed 90cm for troughed profiles.
> For tile profile sheets the maximum purlin gap should not exceed 45 cm.
> A minimum slope angle of 22.5 degrees should be provided for tile roof structures.
> Screws should be installed on the crest of the sheets rather the valleys.
> Guard film (If present) must be removed before installing the sheets.
> Anti capillary groove should always come under the sheet to avoid water spillage.
> An overlap of 30 cm is recommended in case of adjoining sheets.
> Paint the purlins before the installation of sheets.
> A coat of aluminium paint on the contact face of the purlin & trusses is
recommended.
> Lay the starting row sheets at the eaves end with proper alignment of the guide
thread.
> Do provide wider ridges/North Light Curves, while keeping sufficient cover
beyond the accessories, in order to avoid leakage during the monsoons.
> Clean the sheet surface after completion of work to remove debris from screwing
etc.
> If you need to walk on the roof, use a cat ladder to avoid dents.
> While cutting, use a pencil or a steel point mark and cut along the line with a
blade/hacksaw. Ensure that the teeth are fine, in order to avoid uneven edges.
> Avoid contact of the sheet with the metal purlin while pulling it up on to the
structure, as it might damage the primer coat at the bottom of the sheet.
Wrapping a thick piece of cloth on to the purlin can act as a cushion here.
> Yearly cleaning of the sheets with a brush to remove any settlements on the
sheet is recommended.
> Use corrugated or troughed cyclone assembly fasteners for protection against
high winds.
> Avoid contact of the sheets on to concrete or
cemented walls in order to avoid reaction with
the cement in it.
> Avoid bending the sheets sharply.
> Do not cut the sheets with a chisel, as it results in
uneven edges and deformation of the profile.
SCREWS & ACCESSORIES
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> Use anti corrosive screws of higher corrosion resistance to ensure longevity.
> Use aluminum accessories to ensure extended life of the roof.
> Copper/brass/bronze fittings are not to be used,
else bimetallic corrosion can occur.
ENVIRONMENTS
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> Condensation is a natural phenomenon. Ensure that the design includes proper ventilation and sufficient sloping of the roof to check
condensation.
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Control the amount of moisture inside the building and maintain relative humidity.
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Insulating the roof in order to avoid contact of warm humid air on to the cool metal surface.
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Ensure ample air is circulated within the building. If necessary, use fans to encourage evaporation.
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Proper ventilation should be ensured. Direct vents of gas or oil heaters to the exterior of the building. Add ceiling vents that enable warm moist air to escape.
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Dehumidifiers can be used keep a check of the humidity.
> Earth the aluminum sheets correctly. Aluminum offers protection from lightning damage, due to its high electrical conductivity.
> Ensure the use of aluminum conductors.
> Make sure that smoke and fumes (Kitchen, burning of waste or other kinds) does not come it contact of the sheets and is directed away.
> Excessive exposure to saline and or acid atmosphere may hamper the quality of the sheets.
> Cement dust should not settle on the sheets, as it’s highly alkaline and will damage the metal.
TRANSPORTATION
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> Cushioning to be provided using materials like Cardboard/straw/thick tarpaulin or
other appropriate cushioning materials on the truck bed before loading the
roofing sheet, in order to avoid a punching effect from projected bolts/nails.
> Cover the sheets with tarpaulin during the monsoons. Entrapped rainwater can
leave watermarks on the aluminum sheet.
> Do not carry alkali materials (cement/fertilizer,
etc.) together with aluminum roofing sheets.
This may cause a chemical reaction.
> Do not load heavy material on roofing sheets.
> Do not drop the sheets from a height.
HANDLING & STORAGE
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> Store sheets in a covered shed and cover the stack with tarpaulin.
> In case they get wet, make sure to wipe the sheets dry.
> Handle the sheets with care.
> Stack the sheets on a batten with a longitudinal slope to allow condensation to
drain away.
> Don't let water collect between the horizontal
sheets, as trapped moisture is likely to cause
marks.
> Don't keep too many sheets on one stack. If loose
sheets are stacked too high, the bottom sheet
will lose its design mould.
> Don't store sheets near alkaline materials. This
may cause a chemical reaction.
> Don't drop the sheets from a height.
> Don't place the sheets directly on the
mud/cemented floor.