Thermo Ash decking is Class 1 durable per EN 350 — here's what that means in years.
Expected Lifespan
25–30+ years in direct exterior exposure with proper install. Significantly longer on covered decks and ceilings.
What Helps It Last
- Adequate joist spacing and ventilation underneath
- Stainless fasteners — never galvanized
- End-grain sealer on cuts
- Annual debris clearing
How It Compares
| Material | Lifespan |
|---|---|
| Ipe | 50–75 yrs |
| Cumaru | 30–50 yrs |
| Thermo Ash | 25–30+ yrs |
| Composite | 25–30 yrs |
| Cedar | 10–15 yrs |
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