Unless there is adequate positive fall in a roof, there is danger of ponding, which can lead to a reduced service life, or reduced rainwater capacity. Reduced service life is of particular importance in a more severe environment.
At low slopes all roof supports must be in the one plane because slight variations can result in zero or negative fall. This may occur during construction, or even after completion of the building as the result of construction tolerances/practices, settlement, timber warping or shrinking, or extra loadings (such as air conditioners) or suspended surfaces.
Roof slopes lower than the recommended minimum may be available subject to enquiry and will be dependent upon the roof application and building details. Lower roof slopes may require additional provisions to be adhered to – please contact us.