How Close Purlins For Metal Roof

Metal purlins are in stock for immediae will call or delivery.

How close purlins for metal roof.

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. See graph below for sizes of galvanized metal purlins. The better option is to install 1x4 purlins creating a 3 4 thick air space.

The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. They give added support to the roof and also provide a nailing surface for the end panels and drip edge. Purlins parallel to the eave seem called for as the metal roof panels run perpendicular to the eave. Custom sizes and lengths available with a two week lead time.

My simple gable roof is built with trusses covered by osb then underlayment then 2x4 strapping purlins. 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. This provides a path to exit for any leaks thru the metal roof but provides little ventilation beneath the metal roofing. 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.

Metal roof purlins are installed horizontally under metal roofs. Engineered purlin metal mart offers a complete line of engineered purlin material. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. Get free shipping on qualified metal roofing or buy online pick up in store today in the building materials department.

Route trucks servicing the entire united states. Metal cee purlins are available in a wide variety of sizes and lengths. The roof deck is the wood panel ply board or metal sheeting that creates the surface of the roof. They are most commonly used in metal buildings though they sometimes replace closely spaced rafters in wood frame structures.