Roof Pitch Australian Standards

Having such a diverse environment mean the needs for roofing materials vary.

Roof pitch australian standards.

Roofs shapes vary considerably in both cost and construction. If a roof increases in height by four inches for every foot of horizontal run it is considered to have a 4 in 12 pitch or just a 4 pitch talk in terms of pitches and you will always be understood in the roofing universe. The typical roof slope follows specific materials and design techniques to ensure perfect safety from leakage. That is why all roofing manufacturers recommend the 5 degree pitch as the minimum slope and they will not provide any guarantees if it is installed flatter than this.

Asphalt shingles are appropriate on roofs with conventional pitches between 4 12 and 9 12. A common range is given from 1 12 to 4 12 whereas conventional dimensions vary from 4 12 to 9 12 but the steep roofing technique follows slope above 9 12 with additional fasteners. Low slope or flat roofs should not be roofed with asphalt shingles because it is much easier for water to infiltrate the roofing material on a roof with a shallow pitch. Standard roof pitches in australia are usually either 15 degrees or 22 5 degrees depending on the materials used in the roof.

In snowy areas your roof should be at least 10 12 40 to allow snow to shed while the safest roof pitch in very windy areas is between 4 12 6 12 18 5 26 5. Beautifully designed house with flat roof. Corrugated roofing is a great material on traditional pitched roofs but it has severe limitations when the pitch gets below 5 degrees. In addition you may wish to review the various australian standards relevant to the residential construction industry.

Valley gutters on a roof with a pitch more than 12 5 degrees must have a width of at least 400 mm with at least 150 mm of the roof covering overhanging past each side of the gutter. Examples of valley gutters are shown below. In this post we want to share a quick guide to australian roof types. Roofs with extreme pitches either low or steep are inappropriate for certain roofing materials.

We also recommend you read the australian roof building manual. For a gothic style the rafters must equal the span 60 while an elizabethan style requires the rafters to be longer than the span. Australia a country like no other boasting a topography that includes desert plains and vast outback ranges to dense rainforests and coastal seasides.