Pro Rib Steel Roofing Purlin Spacing

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

Pro rib steel roofing purlin spacing.

Install emseal closure 3 inches back from metal. 403 279 2766 skylight chimney cut opening in roof panel. The roof panels are installed similar to the wall panels in layout. Nominal thickness of 0180 g 100 galvanized coating plus zinc phosphate per astm 653.

Cut the first rib off leaving of rib on the first roof sheet of roof steel. Check for square by measuring the distance from the installed panel edge to the chalk line at both the eave and ridge. This option not recom mended for roofing a heated space with no insulation or vapor barrier. Install panels direct ly to wooden framing.

All intermediate fasteners can be. Install the roofing screws vertically along each rib in the panel. Install panels on solid decking install plywood deck. Quantity will vary based on spacing of fastener rows.

Fastener spacing may not exceed 1 1 2 38mm. Since direct contact between pressure treated lumber and metal roofing must be avoided in order to prevent potential corrosion. Place the first screw about 7 inches from the bottom and each subsequent screw about 18 to 24 inches apart along the vertical run. Premium pro rib steel panel substrate shall be.

The washer under the screw head should seal to the surface of the panel without bulging or shifting. Suggested line spacing is one foot beyond 3 panels wide or about 10 feet. Using screws fasten roof at top and bottom of the sheet in the flat next to each rib. 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.

For solid decking use 14 x 1 mp screws. Fyi we run purlins on 3 5 feet on center depending on size of purlin. 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. At bottom of opening slit panels or.

Maximum purlin spacing for roof 5 on center option 1. 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. Rib of roof panel with screws on every rib along both sides of rib. Lay down the first roof steel panel squaring it with the mason line.

Secure the screws but do not overtighten. Keep metal roofing back 3 inches. Do all roofing projects require purlins. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to.

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.