Thoughtful design will
solve future issues

Good design can avoid issues

Overhangs create unwashed areas

The design of your house will affect the life of your pre-painted roofing and cladding. Avoid overhangs and designs that create unwashed areas. These are not naturally washed down by rainwater allowing dirt, salts and other corrosive elements to build up.

You also need to think of how the roof is going to be maintained. All roofs need to be washed down on a regular basis so you need to think of how you are going to access the roof. If the pitch of the roof is too steep to walk on safely you might have to hire a cherry picker or crane every time maintenance is required.


Orientation of the roof is important too, particularly in severe environments. It is important when looking at the aspect of the roof that the metal profile is protected from the effects of salt-laden air being driven in from the sea under the roof profile and accelerating corrosion. In severe and very severe environments it is also important that the right roof profile is chosen.

Spouting, valleys and low pitched roofs

The spouting profile needs to be correctly fixed to prevent corrosive wind-driven water and salts being driven up under the sheets of roofing and causing possible early product failure.

Spouting, valleys and low pitched roofs also need to have the correct fall to prevent ponding which can accelerate potential corrosion.

If anything in this section pre-empts a potential issue talk to your architect, builder or roofer, or contact us.

Design, pitch & aspect

In addition to the environment, the design, pitch and aspect of the house can also effect the length of the warranty.

2km-from-surf-iconFor example a house with a minimum pitch roof and parapets within 2km of the coastline may still require Aluminium, not steel.
water-pitch-surf-iconThe same house with a steeper pitch (which allows rainwater to flow off the roof better) may get a longer warranty period.
severe-care-iconIn areas prone to cyclones and extreme storms, loading spreading washers may be required.

Maintenance helps longevity

All roofing and cladding products require regular maintenance to keep them looking good, to prolong their life and to meet the terms of any product warranty.

The best way to reduce the amount of maintenance required is to pick the right product for the environment. The extremes of temperature, harsh UV rays and salt-laden sea air all eventually take their toll on all buildings.

The harsher the environment the more important it is that a regular maintenance schedule is followed – particularly regular washing down of roofs and cladding – to maximise service life and appearance.

Minimum maintenance requirements
  • Washing of naturally unwashed areas at least every 6 months.
  • Removal of debris from gutters every 6 months.
  • Any noticeable buildup of salt deposits and/or other contaminants are removed when identified.
  • When considering overpainting please consult with your local distributor to ensure correct procedures are undertaken.
  • Inspection of the roof, including fasteners, repair any damage every 6 months.