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Asphalt shingles on a wooden roof structure requirements. Slope is usually used for asphalt shingles roof slope of 20-60 degrees. The slope is less than 20 degrees or greater than 60 degrees of the roof, laying tile required special treatment. See Construction Manual instructions or Saiteng our technical service department. 2 wooden roof construction requirements: 1. Board formation, small deformation, plate thickness above 12mm (thickness selected according purlin spacing). (2) on both sides of the board painted a cold base oil, a thickness of 0.5-1.0mm, play anti-corrosion, moisture-proof effect. 3 between the board and the board pavement left seam 3.0-5.0mm. 4 plate and between purlins or beams with galvanized roofing nails or bolts.