Roofing Materials

• Sheets to cover a square, 4.5 (3.8 sheets equal 100 square feet of material). Allow extra material for multiple hips and valleys.
  
• Nails needed per sheet: 24 average and 38 per ridge cap. Use only genuine Ondura nails.
  
• Ridge caps are 6' 7" long. Allowing for end-laps of 7", the actual ridge coverage is 6 linear feet per cap.
  

• Closure strips needed: Total the length in inches of the eaves plus twice the length of the hips, ridges and valleys. Divide the total inches by the closure strip length of 44 inches to get the number of closures needed.
  
• Skylights: 48" x 79"; 7 oz. heavy-duty translucent fiberglass.
  
• Ondura molded pipeflashing accessory for hot or cold pipes. See Flashing section for additional information.

  Note: For more information, check with your Ondura dealer.

Roofing Materials

• Tiles to cover a square: 24
  
• Shingle roofing nails needed per tile: 12 average.
  
• Average number of 3" Ondura nails needed per tile Tiles installed along eave and ridge rows: 3 per tile. Other tiles: 2 per tile.
  
• Ridge caps are 6' 7" long. Allowing for end-laps of 7", the actual ridge coverage is 6 linear feet per cap. Ridges can be cut into fourths to achieve a tile effect, this reduces the coverage to 58 linear inches.
  

• Closure strips needed: Total the length in inches of the eaves plus twice the length of the hips, ridges and valleys. Divide the total inches by the closure strip length of 44 inches to get the number of closures needed.
  
• Ondura molded pipeflashing accessory for hot or cold pipes. See Flashing section for additional information.

  Note: For more information, check with your Ondura dealer.

Avoid unsightly sawtooth eaves and corrugation lines which disappear into
rake trim by first checking the squareness of your roof using the following method (see Fig. 4).

At a corner where an eave and rake meet (point A), measure 8 feet along the eave purlin and mark (point B). Then measure 6 feet up the rake edge from the eave and make another mark (point C). Measure the distance between B and C. If it's exactly 10 feet, you have a square roof at that corner. If the distance is more or less than 10 feet, that corner is not square.

To determine the amount your roof is out of square from eave to peak, use two steel tapes from points A and B. From point A, measure 6 feet and from point B. measure 10 feet. At The point where the two measurements meet, make a new point C.

Make a chalk line from point A through new point C, all the way to the ridge. At the ridge, measure the distance from the end of the ridge to the chalk line. This is the amount that corner is out of square. If it is not more than 1 inch, the out-of-square condition can be corrected as Ondura is installed up the rake edge by flexing the material (see Fig. 12 or 13).

NOTE: Ondura sheets and tiles are flexible up to 1 inch. For a roof more than 1 inch out-of-square, first correct the rake edge sheets 1 inch, and repeat on the subsequent columns of sheets.