Thermo Ash is the domestic alternative to tropical hardwood decking — Class 1 durable, dimensionally stable, and grown sustainably in North America.
Why Thermo Ash for Decking
- Class 1 durability (25–30+ years)
- Roughly 50% lighter than Ipe — easier to handle
- Dimensionally stable thanks to thermal modification
- FSC-eligible, EPD-published
Cost
$14–$22 per SF installed — between Garapa and Cumaru. Materially cheaper than Ipe, slightly above premium composite, and ahead of both on lifecycle cost.
Profiles
Available in grooved (hidden fastener) and S4S (face-screwed). Standard sizes 5/4x6.
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Install Notes
Pre-drill end-grain. Use 304 or 316 stainless trim-head screws — never galvanized. Maintain at least 1/4" gaps for drainage. Ventilate the substructure.
Maintenance
Annual rinse. Optional UV-stabilized oil 1x/year to preserve crème-brûlée color, or let it weather to silver.
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