Maximum purlin spacing for roof 5 on center option 1.
Pro rib steel roofing purlin spacing.
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.
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.
Since direct contact between pressure treated lumber and metal roofing must be avoided in order to prevent potential corrosion.
Secure the screws but do not overtighten.
At bottom of opening slit panels or.
This option not recom mended for roofing a heated space with no insulation or vapor barrier.
Cut the first rib off leaving of rib on the first roof sheet of roof steel.
Premium pro rib steel panel substrate shall be.
Without a set of blueprints with a pe s seal you have no option but to follow the inspectors gig.
Using screws fasten roof at top and bottom of the sheet in the flat next to each rib.
Keep metal roofing back 3 inches.
Install panels direct ly to wooden framing.
Rib of roof panel with screws on every rib along both sides of rib.
Install panels on solid decking install plywood deck.
For solid decking use 14 x 1 mp screws.
Lay down the first roof steel panel squaring it with the mason line.
Check for square by measuring the distance from the installed panel edge to the chalk line at both the eave and ridge.
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.
Fastener spacing may not exceed 1 1 2 38mm.
The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to.
Purlin spacing is dependent on profile of the metal and gauge plus snow and wind load plus what the rafters are designed to carry.
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.
Do all roofing projects require purlins.
We do recommend it however.
The roof panels are installed similar to the wall panels in layout.
Install the roofing screws vertically along each rib in the panel.
Fyi we run purlins on 3 5 feet on center depending on size of purlin.
Quantity will vary based on spacing of fastener rows.
Use 5 purlin spacing maximum install panels note.
Install emseal closure 3 inches back from metal.
Nominal thickness of 0180 g 100 galvanized coating plus zinc phosphate per astm 653.
The washer under the screw head should seal to the surface of the panel without bulging or shifting.
All intermediate fasteners can be.
