Minimum Shed Roof Slope

Simply put pitch is expressed as rise over run just as the grade is simply this fraction expressed as a percentage.

Minimum shed roof slope.

There are advantages and disadvantages to having a steep pitch versus a shallow or low pitch. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. Visit the shed roofing page. A 4 12 pitch being 4 inches of vertical rise over one foot or 12 inches of horizontal run.

Remember metal roofing is more expensive than shingles. In roofing it is expressed in inches of vertical rise over inches of horizontal run. The corrugated metal roof minimum slope is 5 degrees. For slopes below 20 degrees systems such as epdm fibreglass metal roofing can be used.

For lots more information on which roof finish to use for which slope and indicative costs. It is the recommended slope as there is no guarantee if you opt for flatter pitch than this. Determine the minimum slope of the roof based on the roofing material. A quarter inch slope is the lowest you would go with a metal roof experts recommend at least a half inch minimum to ensure a weatherproof interior for your shed.

Felt shingle systems can achieve lower slopes down to about 20 degrees. Match roof material and use appropriate slope match the roofing on the covered porch with the main roof.