How to Install Ondura Roof Panels

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Ondura roof panels can go on new or existing roofs. Roof installers secure Ondura roof panels -- a corrugated fiber and asphalt roof panel -- directly to purlins or on top of an existing roof covering. Ondura roof panels hold snow loads up to 55 pounds per square foot and can withstand winds up to 100 mph. Ondura's sound-deadening qualities absorb storm noise, keeping livestock housed in an Ondura-covered barn calm during a heavy rainfall.

Things You'll Need

  • Tape measure
  • Caulk box
  • 1-inch roofing nail
  • Ondura nails
  • Hammer
  • String
  • Utility knife
  • Place a pencil mark on the roof's eave 48 inches from its rake, using a tape measure to measure from the rake toward the center of the eave. The roof's rake, the sloped edge of the roof, runs from the roof's eave to the roof's peak. Place a second pencil mark on the roof's peak 48 inches from the rake.

  • Secure a chalk box's chalk line against the eave's pencil mark, using either a 1-inch roofing nail or a helper to hold the end of the chalk line in place. Stretch the chalk line to the pencil mark on the roof's peak. Pull the chalk line taunt and hold the chalk line against the pencil mark with one hand. Pull up on the chalk line with the second hand and release the chalk line, allowing the chalk line to snap against the roof.

  • Drive an Ondura nail into the vertical edge of both ends of the eave, using a hammer to tap the nail's head. Leave at least 2 inches of the nail exposed. An Ondura nail has a 3-inch-long shank and a rubber washer surrounding its head.

  • Tie a string to one of the Ondura nails 1 3/4 inches away from the eave, using a tape measure to measure from the eave toward the Ondura nail's head. Stretch the string to the eave's second Ondura nail. Tie the string to the second Ondura nail, positioning the string 1 3/4 inches away from the eave. This will act as a guide for lining up the lower ends of the panels.

  • Set the first Ondura roof panel on the building's roof. Align the 48-inch-long end of the Ondura panel with the string and the side of the panel with the vertical chalk line. An Ondura panel measures 48 inches across the top and bottom. An Ondura panel measures either 19 3/4 or 79 inches along its sides, depending on the type of Ondura panel used.

  • Secure the first Ondura panel to the building's roof purlins or existing roof with Ondura nails, using a hammer to drive a nail into the center of the panel's corrugation ridges. Place a nail in the center of each corrugation ridge across the top and bottom of the panel. Run additional nails in every other corrugation ridge across each roof purlin. Roof purlins run vertically across the roof and are usually spaced 18 to 24 inches apart.

  • Place the second Ondura panel's first corrugation ridge on top of the first Ondura panel's last corrugation ridge, creating an overlapping seam. Align the bottom of the second panel with the eave's string. Secure the second panel to the roof purlins with the Ondura nails, using the same nail pattern used on the first panel.

  • Complete the first row of Ondura panels, using the same installation method used on the second panel. Cut the last roof panel to size, if needed, with a utility knife.

  • Measure down 7 inches from the top edge of the first Ondura panel and place a pencil mark at the appropriate spot. Place a second pencil mark 7 inches down from the top of the first row's last piece. Create a chalk line between the two pencil marks.

  • Place the second row of Ondura panels on the roof, aligning the bottom of the second row with the chalk line across the top of the first row. Secure the Ondura panels to the roof purlins with the Ondura nails, using the same nail pattern used on the first row. Mount each additional row of Ondura panels on the roof, using the same layout and installation method used for the second row.

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