Minimum Shed Roof Slope

For lots more information on which roof finish to use for which slope and indicative costs.

Minimum shed roof slope.

Determine the minimum slope of the roof based on the roofing material. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. It is the recommended slope as there is no guarantee if you opt for flatter pitch than this. A 4 12 pitch being 4 inches of vertical rise over one foot or 12 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. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. In roofing it is expressed in inches of vertical rise over inches of horizontal run.

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. Visit the shed roofing page. Simply put pitch is expressed as rise over run just as the grade is simply this fraction expressed as a percentage. Felt shingle systems can achieve lower slopes down to about 20 degrees.

The minimum pitch for. Remember metal roofing is more expensive than shingles.