Pitch Required For Green Roof

The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

Pitch required for green roof. Drainage thickness of growing media plant varieties etc. The slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches. To put it in perspective the angle of this slope would be around 30 degrees. Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot.

A recent trend is to adapt green roof technology for low and steep slope applications. A roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch. It is important for shingle roofs to function properly and one method of ensuring that this is achieved is to observe the pitch requirements for the shingles. Sloped roofs retain less water in general and the moisture content varies from the ridge to the eave lowest edge of the roof.

This means that the rise of the slope goes up or down 8 inches for every 12 inches. Secondary roof drains are to be positioned on the roof so that water will drains to the primary upslope and they should not be installed at the same elevation as the primary. While the basic components of a sloped green roof are similar to that of a flat system building teams must pay particular attention to water management erosion control. Normal shingle installation is allowed for all roofs with a pitch of 4 12 and above.

However you can only use this pitch with built up roofing or specialized synthetic roofing. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Asphalt shingles continue to be the most widely installed roof covering option in north america. Roof slope of 1 4 per foot minimum is required on all roof systems.

As the popularity of vegetated roofs grows in the u s building teams are finding new methods for greening rooftops. Low sloped roof shingle installation. Sometimes pitch is also expressed in. The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7.

It is the task of the designer to make adjustments in the green roof system accordingly e g. If 4 12 and above is normal and 2 12 is minimum what about properties with roofs in between the two such as a 3 12 pitched roof. Slope should be built into the structure on new buildings. The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span.

An example for a steep sloped roof is 8 12. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.