AM Pro Spec, LLC - Home Inspections

Siding should never directly touch roof shingles, as this causes water to wick up, leading to rot, mold, and damaged, failed siding. A minimum 1–2 inch gap (or at least 1/2 inch for vinyl) is recommended between the siding and roof surface to allow for proper drainage. Correct flashing, such as step flashing, must be installed behind the siding to prevent leaks.