Vinyl siding lasts 20–40 years; fiber cement (Hardie board) up to 50 years; wood siding 10–30 years depending on maintenance.
Siding is one of the most variable home exterior components by material type. InterNACHI and NAHB data shows vinyl siding lasting 20–40 years; fiber cement (Hardie Board) rated for 50 years; wood siding requiring the most maintenance at 10–30 years depending on paint maintenance and climate. Siding's primary function is moisture protection — the most common failure mode is not aesthetic degradation but water infiltration behind failed seams, cracks, or rotted sections. Once water gets behind siding, the damage to the house wrap, sheathing, and framing is often extensive before it becomes visible.
Replace siding when moisture is found behind panels, when rot is widespread (more than 20% of panels affected), when vinyl is cracking and brittle from UV degradation, or when energy bills are elevated due to siding gaps allowing air infiltration. Replacing in sections is possible for spot damage, though color matching old vinyl is difficult after years of weathering.
When replacing siding, add a continuous layer of rigid foam insulation (1–2 inches) behind the new siding. This thermal break eliminates cold spots on the interior wall surface and can reduce heating energy use by 5–15%. The marginal cost at time of siding replacement is modest — adding rigid foam insulation to an existing house without siding work is extremely expensive and disruptive.
Vinyl siding lasts 20–40 years per InterNACHI standards. Higher-quality vinyl with UV inhibitors lasts toward the upper end. The primary failure mode is UV-induced chalking and brittleness, usually appearing after 20–25 years in direct sun exposure. Impact damage (hail, debris) can shorten effective life regardless of age.
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