Pro Rib Steel Roofing Purlin Spacing

This option not recom mended for roofing a heated space with no insulation or vapor barrier.

Pro rib steel roofing purlin spacing.

Cut the first rib off leaving of rib on the first roof sheet of roof steel. Keep metal roofing back 3 inches. At bottom of opening slit panels or. Use 5 purlin spacing maximum install panels note.

Fyi we run purlins on 3 5 feet on center depending on size of purlin. Install the roofing screws vertically along each rib in the panel. Place the first screw about 7 inches from the bottom and each subsequent screw about 18 to 24 inches apart along the vertical run. Install panels direct ly to wooden framing.

Check for square by measuring the distance from the installed panel edge to the chalk line at both the eave and ridge. The washer under the screw head should seal to the surface of the panel without bulging or shifting. Roof sheathing consists of premium pro rib steel panels attached to the top edge of roof purlins in accordance with manufacturer s specifications or as shown on design drawings. Install panels on solid decking install plywood deck.

Grand rib 3 style metal roofing can be separated from the moisture barrier by minimum nominal 1 x3 yellow pine battens spaced on maximum 24 centers or according to asce calculations where applicable. Suggested line spacing is one foot beyond 3 panels wide or about 10 feet. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. We do recommend it however.

Since direct contact between pressure treated lumber and metal roofing must be avoided in order to prevent potential corrosion. For solid decking use 14 x 1 mp screws. Without a set of blueprints with a pe s seal you have no option but to follow the inspectors gig. 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.

Secure the screws but do not overtighten. The roof panels are installed similar to the wall panels in layout. Rib of roof panel with screws on every rib along both sides of rib. Install emseal closure 3 inches back from metal.

Maximum purlin spacing for roof 5 on center option 1. Using screws fasten roof at top and bottom of the sheet in the flat next to each rib. All intermediate fasteners can be. Fastener spacing may not exceed 1 1 2 38mm.

Nominal thickness of 0180 g 100 galvanized coating plus zinc phosphate per astm 653. Lay down the first roof steel panel squaring it with the mason line. For 2 x 4 purlins use 9 x 1 woodfast screws fastener spacing panel screws per lineal foot of roofing 12 4 5 18 3 0. Do all roofing projects require purlins.

Purlin spacing is dependent on profile of the metal and gauge plus snow and wind load plus what the rafters are designed to carry.