Perlin Size For Metal Porch Roof

Dead load will be the actual weight of the roof steel and the roof purlins.

Perlin size for metal porch roof.

If you want to know how to support roof purlins they are usually supported by 2 4 or 2 6 struts or posts. Cut the last purlin to size with tin snips if necessary. For the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap. The standard of purlin length will vary anywhere between 100 to 300 mm while the thickness will vary anywhere between 1 to 3 mm.

Snap the third chalk line two more feet down and continue down the roof until it is covered with purlins. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. Engineered purlin metal mart offers a complete line of engineered purlin material. Net variation for combned dimension.

Available in cee or zee shape red oxide primed or galvanized 16 14 or 12 gauge sizes from 4 up to 12 flange widths of 1 1 2 up to 4 cut to your specified lengths hole punching available load tables available for all material. 20 psf x 949 1 5 psf x 12 x 949 x 11 625 2 8 x 3 0625 x 1 15 x 1 15 972 75 psi. The substructure to which the metal panels are fastened must be properly spaced and sufficiently thick to provide a roof or wall system able to meet required design loads. Do all roofing projects require purlins.

For 2x4s purlins the posts are spaced in 4 feet distance. Move two feet down the roof and snap a horizontal chalk line. For sake of discussion we will assume a minimal roof snow load of 20 psf pounds per square foot and a 4 12 roof slope. 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.

The typical spacing standards for residential and commercial buildings are about 1 to 2 foot. Cee purlin lengths are cut to length from 6 45 in 1 8 increments though 20 and 25 are the most commonly chosen lengths. Twist is measured with the zee laying on a flat surface under its own weight.