Metal Roof Purlins

What Are Metal Roof Purlins?

A purlin is a horizontal board on roofs for attaching metal. They span the roof deck, are spaced 3 feet apart, and are fixed to the rafter. Radiant barriers can replace felt under purlins for a better underlayment.

Photo of metal roof purlins.

Purlins screw into rafters every 3 feet and allow a fastening surface for roof metal sheets.

Illustration of metal roof layers.

Key Features

  • Roof Support: Provide support for the roof covering and tie into buildings structural support.
  • Attachment Points: Serve as attachment points for roofing materials.
  • Stabilization: Stabilize rafters or trusses, preventing buckling or twisting.

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