Aluminum Siding (also Steel Siding)
Aluminum Siding (also Steel Siding)
Aluminum siding and steel siding are most commonly seen as interlocking horizontal strips. They are also seen as vertical panels. Finishes include smooth and textured simulating wood. These types of siding should be installed by fastening the siding to sheathed walls covered by a water-resistive barrier. Aluminum siding was first available in the late 1940s and was most popular during 1950s and 1960s. It is currently available but rarely installed in many markets. Steel siding is uncommon on houses in most markets.
There is a widely held belief that metal wall covering and roof covering materials must be grounded or bonded. There is no such requirement. The mechanical and electrical connections between pieces of metal wall coverings and roof coverings are not sufficient to create a continuous current path to any grounding or bonding conductor connection point.
Typical Defects Typical defects that home inspectors should report include:
- absent and deteriorated flashing and sealant around doors, windows, and other penetrations,
- absent and improperly installed flashing and kick out flashing at wall intersections,
- damaged and deteriorated siding and trim,
- fading or pealing finish,
- oxidation where bare metal is exposed,
- buckling siding, often caused by siding being fastened too tightly against the wall.
Standards (1) IRC 2018 Section R703; (2) grounding/bonding of metal siding is not required by model codes, but may be required in some jurisdictions; (3) manufacturer’s instructions.
