High-Wind Zones require a proper flashing system at the roof-to-wall transition to keep water from getting behind the roof cover. Step flashing is installed along the edge where the roof meets the wall, with segments stepping up the wall under each course of shingles so water is directed away from the joint. Counter flashing is then applied over the step flashing, secured into the wall material, and overlapping the step flashing to seal against wind-driven rain and movement. This combination creates a continuous barrier at the intersection and resists wind uplift. Caulk alone can't hold up under wind and temperature cycling, so it can crack and leak; having no flashing leaves the joint exposed to water intrusion; and relying solely on shingles does not address the wall interface where leaks commonly occur.

When two roof slopes come together, the water has a natural channel to flow away from the intersection. That channel is called a valley. Valleys collect and direct runoff down toward the gutters or lower edge of the roof, so they must be properly flashed and shingles laid to prevent leaks where the planes meet. Other roof features that aren’t the channel for water between slopes: a hip is the external corner where two slopes meet on a hip roof, not the interior channel. The ridge cap sits along the roof’s peak where two slopes meet at the top. The eave soffit is the underside of the overhanging edge of the roof, not the water channel between slopes.

Wind uplift describes the upward force from wind on a roof that can lift shingles, loosen fasteners, and damage the roofing system. This uplift results from the airflow around the building creating pressure differences that pull on the roof materials, especially at edges and corners where the force is strongest. Proper attachment, edge restraints, and wind-rated materials help resist this upward pull. By contrast, wind gusts refer to brief bursts of wind speed, wind shear is about how wind speed changes with height, and wind load is the overall wind pressure on the structure. The term that specifically captures the upward pull acting on roofing materials is wind uplift.

MSDS requirements come from OSHA’s Hazard Communication Standard (HazCom). This standard ensures workers know the hazards of the chemicals they may encounter by requiring employers to have a chemical safety program, label containers, provide access to Safety Data Sheets (the modern term for MSDS), and train employees on safe handling, storage, and emergency actions. On a roofing job, you might deal with solvents, adhesives, asphalt, and cleaners, all of which have chemical hazards that must be disclosed and communicated through SDSs. The fall protection standard is about preventing falls, not chemical hazards, so it doesn’t address MSDS. Ridge vent and laminated asphalt shingle are roofing products, not standards, so they don’t govern MSDS requirements.