Roof Deck Slope Ratio

A minimum slope of 1 50 1 4 in 12 is strongly recommended.

Roof deck slope ratio.

Match roof material and use appropriate slope match the roofing on the covered porch with the main roof. The risk of saturated bedding sand is reduced by adequate slope of the roof structure and correct sand gradation. Sand requires at least a minimum deck slope of 2 to drain. We were able to make new crickets to the existing roof membrane providing positive water flow to the drains.

3 use the divided measurement as the total amount of slope for the deck in inches. Flat roofs which aren t perfectly flat require a small slope to allow for water runoff. If the deck extends 9 feet out from the house the divided measurement is 1 8. A deck that projects 9 feet out.

Gradation of the bedding sand for pedestrian applications should conform to astm c 33 7 or csa a23 1 fa 1 8. Determine the minimum slope of the roof based on the roofing material. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. Then we were able to correct the owner s ponding water concerns.

You can divide roofs into these categories. The minimum pitch for. Generally such roofs have a pitch ranging from 1 2 12 to 2 12.