Roof Deck Slope Ratio

Then we were able to correct the owner s ponding water concerns.

Roof deck slope ratio.

3 use the divided measurement as the total amount of slope for the deck in inches. You can divide roofs into these categories. The minimum pitch for. Sand requires at least a minimum deck slope of 2 to drain.

Generally such roofs have a pitch ranging from 1 2 12 to 2 12. A deck that projects 9 feet out. We were able to make new crickets to the existing roof membrane providing positive water flow to the drains. Determine the minimum slope of the roof based on the roofing material.

Roof slope created a simple and great fix to a project were crickets were missed and ponding water became an issue for an owner. The risk of saturated bedding sand is reduced by adequate slope of the roof structure and correct sand gradation. If the deck extends 9 feet out from the house the divided measurement is 1 8. Often you express roof pitch as the ratio between the rise and the run in the form of x 12.

A minimum slope of 1 50 1 4 in 12 is strongly recommended. Gradation of the bedding sand for pedestrian applications should conform to astm c 33 7 or csa a23 1 fa 1 8. Flat roofs which aren t perfectly flat require a small slope to allow for water runoff.