Porch Roof Slopes

Local building codes dictate the minimum slope of your porch roof.

Porch roof slopes.

Determine the minimum slope of the roof based on the roofing material. Roof pitch refers to the slope which the rafter creates. The side of the roof you selected will have a green arrow indicating it is ready to be edited. Many times the slope or pitch of the ranch home s roof is such that a shed roof is not workable.

The minimum pitch for. Low slope or steep slope commercial application. The pitch of these roofs can range from a minimum of 3 4 to very steep depending on local building codes. 3 12 1 2 12 and 1 4 12.

Gable roofs have two sloping surfaces from the ridge usually in the center joining at the side walls. I e 4 inches of rise per 12 inches one foot of run. In most cases the porch roof will be the same pitch as your home s roof slope. Stretching roof edge left click to select the edge of the roof that you want to stretch out over a porch area.

Something along the lines of if the main roof is 12 12 then the shed dormer roof would be 4 12 i just made that up. They can be seen on many ranch homes and porches throughout the country. If the area of the porch is too deep the house roof line will look somewhat high and out of place. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

Roof slopes are most commonly defined by the rise over run ratio. You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof. When you select the roof edge arrows will appear along the edge of the roof on each separate roof surface. Match roof material and use appropriate slope match the roofing on the covered porch with the main roof.

If a roof slope rises say 4 inches when measured 12 inches along the bottom of a horizontal roof truss the roof slope is said to be 4 12. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. The most common slopes are. This can be usually seen on a porch deck or n a long narrow porch.

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. Its design is shallow to compliment the design of a house. When looking at metal roofing panel you will need to consult with the manufacturer to ensure that the metal panel you selected will work for your application. Is there a formula for determining the porch roof slope so that it remains in keeping with the slope of the main roof.

Slope is a critical factor when adding a shed roof to a ranch home.