Roof Drop Per Foot

Some building codes start at one quarter of an inch per foot or two percent.

Roof drop per foot.

A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. Anything with a slope of some kind will cause water to run off the roof. Minimum roof pitch for a covered porch. Most metal roofs will have minimum pitches of three in twelve but this might sometimes go down depending on whether there are special installation procedures issued by the manufacturer regarding that particular roofing material.

A roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run. No you cannot install metal shingles on a low slope roof. Adding a covered porch adds exterior space to a house and providing a.

Pitch is thus the ratio of the rise in inches to a 12 inch run and is often expressed using a semicolon for example 6 12. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. A roof protects a house and porch from snow and rain as well as the heat of the sun. However an ideal roof drop per foot should be at least one eighth to one quarter of an inch per foot.

Anything less than one eighth of an inch may pool on the roof.