6. Roof Pitch (Falls)

6.1 All roofing materials are to be installed at NO LESS than the recommended minimum fall specified by the manufacturer – noting that different manufacturers have different falls for products with the same name as other manufacturers. Some manufacturers allow 1 degree for Kliplok; others will allow 1.5 degrees as an example.

6.2 It is preferable to have a minimum of 5 degrees pitch. Custom orb must not be used under 5 degrees under any circumstances. With roof pitch of less than 10 degrees, turndowns and weather strips are required (costing more money), with a pitch of 5 degrees there is a requirement to use specific roof profiles – costing even more money.

6.3 There is considerable greater risk of leaking and with a pitch of below 5 degrees.

6.4 NO roof is be installed at less than 2 degree pitch (Custom Orb 5 degrees) regardless of manufacturer recommendations unless approved by the team leader and a confirmation IN WRITING is provided by the structural engineer they will guarantee that the roof will not deflect under all (live and dead loads) conditions to a pitch of less than the manufacturers requirement – for example 1 degree.

6.5 Roofs less than 2 degree pitch REGULARLY deflect to a point where the roof PONDS – the structure sags so much the roof does not fall.

6.6 This is highlighted in all manuals, standards and so on but seldom considered. This is a TOLERANCE issue that MUST be considered

6.7 Check the drawings before roof framing commences off site. Resolve the pitch before fabrication of trusses or steel frame is commenced.

6.8 Double check the frame installation with a spirit level and a tape – see typical roof sheeting minimum falls and site checking measurements.