Minimum Pitch For Roof Sheeting

The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span.

Minimum pitch for roof sheeting.

The pitch is measured in inches of vertical rise per foot of horizontal run and the 5v crimp profile shown above requires a minimum slope of three in twelve or 3 12 3 inches vertically per 12 inches horizontally. The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. 8d ring shank nails should be used instead.

Sheathing should be a minimum of 19 32 inch thick. However you can only use this pitch with built up roofing or specialized synthetic roofing. Loads will vary with the. However it is regrettable that many installers usually ignore this requirement due to the desire for a quick installation process.

Never attach roof sheathing with staples. Minimum thickness most roofs will be sheathed in plywood at least 3 8 inch thick. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. Profile in the context of metal roofing means the shape that the sheet of metal is bent into to form the panels.

The pitch of a roof is expressed in a ratio of rise over run creating a theoretical triangle with these numbers to illustrate the amount of slope. The minimum pitch allowed for metal shingles is a 3 12 ratio whereas metal panelling can be applied down to a 1 12 ratio. The typical thickness range for sheathing is 3 8 to 3 4 inch. Anything above that will require you to put out higher cost because they are already considered as higher pitch.

That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures. 2 degrees if there are no penetrations in the concealed fix roof system or 7 5 degrees is there are any vents or penetrations in the roof system. Concealed fix minimum roof pitch.

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process.