Composition Shingle Roofing / Ron Williams - Roof Doctor

The composition shingle roof is an excellent value in roofing material. Currently, in California the minimum slope requirement for a composition shingle roof is 2-1/2" in 12", or 2-1/2 inches of vertical fall for every 12 inches of horizontal run. Although this is a minimum requirement, it has been my experience that the thicker composition shingles (30 to 50 year) do not perform well on anything less than a 3" in 12" slope or "pitch", as it is called in the industry. We see leaking shingle roofs all the time that leak because they were installed over a surface with 2-1/2" or less slope.

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 These Velux skylights were leaking for years and no amount of mastic or caulking was fixing the leak.

Right: Ron Williams Roof Doctor ordered new flashing kits from Velux and installed them. We also had to manufacture a custom piece of channel for the center because the skylights are so close together.

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