ONDURA-9 ™ 9-Corrugation Asphalt Roofing Sheets I N S T A L L A T I O N I N S T R U C T I O N S
Thank you for choosing ONDURA-9 for your roofing project. ONDURA-9 should be carefully installed. Mistakes in installation can cause roof problems later on. Please take your time and closely follow these installation guidelines. CAUTION Installation of roofing materials can be dangerous. The relative amount of danger is increased by the height from the ground, increasing pitches of the roof slope, inclement weather conditions or other factors.
Note: At the ridge of the roof, the gap across the ridge, between the upper ends of the ONDURA-9 sheets on each side of the roof, will be covered by the ridge cap; and the gap should be no more than two inches. PLANNING STAGE Determine the Slope of the Roof The slope of the roof can be calculated from measurements of the rise and run of the roof. The rise is the vertical distance of the ridge above the eave. The run is the horizontal distance of the ridge from the eave.
Placement of ONDURA-9 Sheets If more than one row of ONDURA-9 sheets is needed, then the sheets must be installed along the eave first. Then additional rows are installed above the previous row. Each row should be installed with the first sheet at the opposite end of the roof from the prevailing winds. With this orientation, the seam of the overlap will face away from the prevailing winds. This orientation will reduce the possibility of wind-driven rain getting under the corrugation overlap.
Measure distance along the ax ch m sheet corrugation from eave 5 in edge of sheet to outer wall of structure. The lower line of nails should be installed high enough on the sheet to be on or inside the wall support. The typical distance from the eave edge of a sheet to the outer wall is 2 to 3 inches. For resistance to wind uplift, the maximum distance from the eave edge of a sheet to the first row of nails is 5 inches.
ADDITIONAL TIPS Pulling Nails To pull a nail from an ONDURA-9 sheet, use a claw hammer and a 1-1/2 inch wood dowel or pipe. This technique minimizes the chance of damaging the sheet. Put the dowel or pipe in the valley next to the crown where the nail will be pulled. Then use the dowel or pipe as a leverage point for pulling the nail. Walking on an ONDURA-9 Roof When walking on nailed-down ONDURA-9 sheets, wear softsoled shoes and walk on areas that have structural support from sheathing or purlins.
