Asphalt Shingle Roof Installation - Light Gray, Low-Slope Sections

This was a wide, low-profile single-story house with a roof that ran on for square footage but had multiple lower-pitch sections that needed special attention.

Standard asphalt shingles are rated for pitches of 4:12 and steeper. Below that, water sits longer and wind-driven rain pushes harder against every seam. California building code requires double-layer self-adhered membrane on pitches below 4:12 - a code requirement that most contractors either don't know or ignore to save money. We don't.

The low-slope sections of this home got a full double-layer self-adhered underlayment system starting at the eave and running up past the point where the pitch hit 4:12. The standard-pitch sections got a single layer of high-temp synthetic underlayment. Every transition between the two systems was lapped and sealed correctly.

The shingles are architectural-grade in a light-gray blend. Light-gray shingles with cool-roof granules can reflect 20-30% more solar radiation than older dark shingles with baked-off granules.

Five photos document the low-slope sections, the underlayment transition, the completed shingle field, and the overall elevation.