Siding · Engineered wood siding
How long does engineered wood siding last?
InterNACHI's baseline chart gives engineered wood siding 100+ years. It is the most generous figure on this page, attached to the category with the hardest history — the composite and hardboard sidings of the 1980s and 1990s produced some of the largest building-product settlements in the country. The current paper is more candid about its own limits: LP's SmartSide term runs 50 years, and everything past year five is prorated down toward nothing.
Updated
The gap: warranty ends at 50 years; typical service life ends around 100+ years. The material typically outruns the paper by about 70 years. Warranty document (LP Building Solutions, checked 2026-08-27)
Typical service life: 100+ years
The chart's entry is "100+" with no upper figure, on a chart carrying no date of its own; the 120 here only bounds the drawing. Read it as a category estimate rather than an observation — today's resin-and-strand siding has been on walls only since the late 1990s, and the generation of composite siding it replaced came nowhere near this figure.
Tier 3 · baseline chart (undated) Range from InterNACHI — Standard Estimated Life Expectancy Chart for Homes, checked 2026-08-27.
This siding is wood with a coating over it, so it lives or dies on the coating. In wet, shaded and freeze-thaw climates the schedule that matters is the repaint-and-recaulk schedule; in dry climates the boards can run a long time on their original finish. Worth noting that the hail coverage stops at 1.75 inches, which across the hail belt is an ordinary storm rather than a rare one.
What the warranty paper actually says
LP Building Solutions (LP SmartSide Prorated 50-Year Limited Warranty (the "5/50")) publishes a 50-year limited, prorated, transferable, conditional warranty. Only the first five years are worth their face value: inside that window LP pays labor and material to repair or replace, priced off RSMeans. From the sixth year the coverage is material only — no labor, no removal, no disposal — and it is cut by a further 2.22% every year, so a claim around year 28 collects roughly half the board cost and a claim near year 50 collects essentially nothing. Total payment is capped at twice the original purchase price. Hail is covered to 1.75 inches, but only after the owner has filed with their own insurer first, and only for the shortfall, less the deductible, less that same annual reduction. The term reaches the original owner and the next owner of the house, and stops there.
The warranty document itself , checked 2026-08-27.
What shortens it
- Any breach in the factory coating — unsealed field cuts, drilled holes and scuffed edges expose the wood strands underneath
- Ground, roof and deck clearances closed up later by regrading, piled mulch, or a new deck ledger
- Sprinkler spray and roof runoff soaking the same courses through every wet season
- Paint left to fail, because the substrate is wood and the finish is the only thing keeping water out of it
- Trapped moisture behind the boards where no drainage gap or water-resistive barrier was provided
Signs of wear to look for
- Swelling and thickening at butt ends and bottom edges, so joints stand proud of the wall
- The surface overlay cracking, chipping, flaking or lifting away from the substrate beneath it
- Boards that feel spongy or fibrous when pressed, near grade or under a leaking gutter
- Fastener heads sinking into softened board, or rust bleeding out around them
- Waviness or buckling across a run that was flat when the wall was new
Boards gone this soft usually mean water has been in the wall a while, and what it reached — sheathing, studs, sill plate — cannot be judged from the outside. That is an inspection question, not a web-page question.
Other siding materials
- Vinyl siding 50+ yrs
- Fiber cement siding 100+ yrs
- Wood siding 100+ yrs
- Aluminum siding 25+ yrs
- Brick veneer 150+ yrs
- Stucco 50–100 yrs
- Manufactured stone veneer 100+ yrs