Summer in Sunnyvale is prime time for neighborhood transformations. With Silicon Valley’s booming housing market, more homeowners across the South Bay are expanding their footprints whether that means a seamless master suite extension or building a detached Accessory Dwelling Unit (ADU) in the backyard for family or rental income. If your summer renovation project involves a flat or low-slope roof design, you face a unique set of structural and compliance challenges. Standard asphalt shingles won’t work here; standing water will...