Codes, standards, manufacturer instructions and safe work practices for metal flashing installation
Code, standard and manufacturer requirements define minimum flashing performance, but the governing detail is usually the most restrictive applicable requirement. The exam tests adoption, load and drainage provisions, product instructions and safe work practices.
Core rules
- The building code adopts structural and fire provisions; ASCE 7 provides wind and load criteria; SMACNA and NRCA guidance and manufacturer instructions fill in detailing. Check the edition adopted by the jurisdiction.
- Manufacturer instructions govern product-specific cleats, fasteners, sealants, expansion joints and coatings. A code minimum does not excuse a weaker manufacturer detail.
- Flashing must resist design wind uplift, especially at edges and corners. Edge metal and copings need the specified attachment pattern and continuous cleat.
- Hot work requires a permit, fire watch, clearance from combustibles and appropriate extinguishers. Soldering and lead work need ventilation and PPE; lead dust and fumes must be controlled.
- Fall protection is required when workers are exposed to falls; use guardrails, personal fall-arrest systems and safe access.
Worked example
A specification requires a factory-formed coping cleat fastened at 12 in. on center, but the crew uses 24 in. because the local code table allows it. A wind-uplift calculation for the corner zone requires the denser pattern. The manufacturer's 12-in. spacing governs because it is the more restrictive product instruction and is needed to validate the system. The crew must install the continuous cleat and 12-in. pattern, with approved fasteners, and the inspector should reject the 24-in. work even if it looks adequate.
Traps
Treating code minimum as the maximum; ignoring manufacturer instructions; substituting sealant for mechanical flashing; skipping fire watch; using fall protection incorrectly; assuming one fastener pattern fits all zones.