Proper Roof Slope For Rain

Take the downspout end of the string lower it 3 4 of an inch and reattach it.

Proper roof slope for rain.

The primary reason roof pitch exists in the first place is to redirect water. The roof pitch would be described as a 6 12 pitch. A handy roof slope estimator can help you determine if your roof slope is likely too low for shingles. Measure the length of the string to determine the distance between the two points.

The majority of north american residential roofs have historically been constructed with a slope between about 4 12 and 9 12. It is an essential element to ensure water drains properly off of your roof. This means that your gutter should be a half inch lower in height at every 10 foot mark until you reach the downspout. This means that the rise of the slope goes up or down 8 inches for every 12 inches.

To put it in perspective the angle of this slope would be around 30 degrees. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. At that point measure down from the exposed butt end back to the roof surface. Divide the results by the number of 12 inch segments in your level.

The slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches. The standard slope for rain gutters is half of an inch for every 10 feet. For gutter runs longer than 40 feet it s best to pitch the gutter down from the middle to a downspout at each end. Roofs at the lower end of the range about 4 12 to 6 12 are relatively easy to walk and work on.

For spans longer than 40 feet it s wise to have a downspout on each end and start the high spot of the gutter in the center. If you have 30 feet of guttering as above you know the slope should be 3 4 of an inch. A wide roof with a steep slope will lead to faster runoff hence necessitating a slightly steeper slope for effective discharge of the rain water. The pitch of your roof also helps determine the type of materials that can be used on your roofing system.

A small roof with a shorter length on the other hand will not collect a lot of water within a short period of time and will work just fine with the minimum roof slope for drainage. To ensure that gutters drain properly make certain they slope inch for every 10 feet toward a downspout. For example if you used a 24 inch level and your measurement was 12 inches the pitch in your roof is 6 in 12. An example for a steep sloped roof is 8 12.