How Close Purlins For Metal Roof

See graph below for sizes of galvanized metal purlins.

How close purlins for metal roof.

Purlins parallel to the eave seem called for as the metal roof panels run perpendicular to the eave. They are most commonly used in metal buildings though they sometimes replace closely spaced rafters in wood frame structures. 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. This provides a path to exit for any leaks thru the metal roof but provides little ventilation beneath the metal roofing.

Metal purlins are in stock for immediae will call or delivery. Purlins are 2 by 4 feet and are installed much like metal roofing. My simple gable roof is built with trusses covered by osb then underlayment then 2x4 strapping purlins. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top.

Metal roofing roof panels the home depot store finder. Metal cee purlins are available in a wide variety of sizes and lengths. Get free shipping on qualified metal roofing or buy online pick up in store today in the building materials department. The roof deck is the wood panel ply board or metal sheeting that creates the surface of the roof.

Route trucks servicing the entire united states. Engineered purlin metal mart offers a complete line of engineered purlin material. 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. They give added support to the roof and also provide a nailing surface for the end panels and drip edge.

The roof has a 4 12 pitch and covers a 20 width and 48 length. The purlins of a roof support the weight of the roof deck. The top chords of some of the trusses seem to be slightly bowed because if i lay a straightedge from peak to eave along some of those lines one or more of the purlins is up to 1 2 higher than the others. Metal roof purlins are installed horizontally under metal roofs.