How To Shape Purlin For Corrugated Roof

The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to.

How to shape purlin for corrugated roof.

To identify whether yours is the earlier or the latter type look for the end of the rails and check whether the shapes mimics the shape of letter c or letter z. Corrugated metal deck and siding is used for roofs and walls respectively to span between purlins for roof loads or between girts for wind loads. Snap a chalk line horizontally across the roof two feet down from the top. The overlaps ends and sides depends upon the sloop of the roof see below.

Lay the first purlin at the ridge of the roof down to the chalk line beginning at either corner. Purlins are non pressure treated 1 x 4 x 12 lumber that is installed on to the roof in a specific layout pattern and screw pattern. Meanwhile there are two kinds of purlin span for metal roof based on the shapes which are the c purlins and z purlins. Install vent as close to roof peak as possible.

Setting corrugated metal roof purlin spacing in a proper distance is an important part of the entire process. Fasten the purlin with 16d common nails into each vertical rafter. The decking is sized to resist the bending caused by these loads. Corrugated sheet roofing material is widely available and easy to use.

Adjust door construction to desired size. However if your metal roof has another supporting method the exact spacing is not. Cut to fit pitch of roof and around vent. The distance lengths are often based on the roofing panels size.

Proper spacing will offer attachment security that resulted in optimal stability. Insert two equally spaced nails into the rafter. Roof decking is often also used as a diaphragm to transfer wind or seismic loads to the lateral bracing system below. The rafters are generally spaced every 16 inches on center.

Apply front and back panels similarly to side walls.