Flat Porch Roof Pitch Standards

Various styles of a pitched roof can be built or you can purchase pre manufactured trusses.

Flat porch roof pitch standards.

Sunday august 5 2018 the traditional metal roof types such as 5v crimp shown above and corrugated are rated by the manufacturers for use down to a 3 12 pitch three inches of vertical rise for every foot of horizontal run. Anything less than one eighth of an inch may pool on the roof. Flat roofs which aren t perfectly flat require a small slope to allow for water runoff. Measure 12 inches from the bottom of the level and mark the spot on your house.

The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs. If you have a flat roof shed or porch you ll need to be sure it has adequate pitch or you could find yourself having to conduct frequent roof repairs due to poor drainage. A flat porch roof is considered to be one of the famous styles of porch roof that can be seen in most of the houses.

Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled. Then measure from the spot created vertically to the roof. However you can only use this pitch with built up roofing or specialized synthetic roofing. This is the number needed for the pitch calculation.

The flat roof already has a slight pitch as it is required by law. Some building codes start at a quarter of an inch per foot. Coal tar pitch is derived from coal distillation and should not be confused with roofing asphalt which is a product of crude oil refining. This is suited for large buildings and houses wherein this would make them appear more attractive and also works in maximizing the space.

The most commonly used roof pitches fall in a range between 4 12 and 9 12. On a ladder tall enough to reach the end of your roof put the level against the house parallel to the ground where the roof meets the house. Most people view pitching a flat roof as a tedious job. You will need to ensure that you are in standards with your local building codes and have the permits required.

The same self healing characteristic restricts the use of coal tar pitch to roof systems of little or no slope typically 1 8 of an inch per foot or less. Pitches above 9 12 are very highly angled and are designated steep slope roofs.