Slope To Drain 1 2 Foot Roof

Learn more about finding the angle of a line using our slope calculator.

Slope to drain 1 2 foot roof.

According to plumbing code drain pipe has to be sloped a minimum of 1 4 inch per foot and a maximum of three inches per foot or vertical. The recommended slope is 1 4 inch per foot but it can be anywhere from 1 8 inch to 3 8 inch per foot depending on other factors. Level roof decks with tapered insulation whether re roofing or new construction getting the drainage correct on level roof decks is still a challenge for most designers. A slope of less than 1 4 inch per foot will cause constant drain clogs and a slope of more than three inches will allow the water to drain without the solids.

Common roof pitches and equivalent grade degree and radian angles. This means that for every foot of the roof it must slope downward by at least one quarter inch. However you can only use this pitch with built up roofing or specialized synthetic roofing. To put it in perspective the angle of this slope would be around 30 degrees.

Use the longest level possible for your application for the best accuracy. Quicket is engineered to elevate the membrane surface as the distance increases away from the roof drains and scuppers. This means that the rise of the slope goes up or down 8 inches for every 12 inches. Same logic with 1 8 slope 1 16 slope etc.

In these instances a system of drains or gutters is necessary to channel the water away from the roof. For example multiplying 12 inches by 2 percent or 0 02 equals 0 24 which represents a slope of roughly 1 4 inch per 12 inches. The sand should be sloped away from the house at the rate of one inch per 20 feet. Commercial buildings with a slope like this are considered low slope.

The slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches. A length to width ratio of 2 to 1 can maximize water flow especially when deck slope is 1 4 inch per foot 2. Drains are usually located at the low points or valleys of the roof. Alternatively builders and codes might simply express the code as 1 4 inch per foot this is the case for drain pipe diameters of 2 1 2 inch or less according to the international plumbing code.

An example for a steep sloped roof is 8 12. Calculating the slope of your drain pipe is easy. Most roof s have a pitch in the 4 12 to 9 12 range. When the bubble on a level is about 1 4 of the way past the line it is about a 1 4 slope.

Quicket can be installed between two layers of roof insulation or placed under an approved cover board. A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.