Same Thermo Ash board, two attachment systems. Here's the trade-off.
Grooved Hidden-Fastener
- No visible screws on the surface
- Faster install on straight runs
- Slight cost premium for the material
S4S Face-Screwed
- Flexible — works on any deck shape
- Lower material cost
- Boards can be removed for service access
Verdict
Grooved for clean modern decks. S4S for value, complex layouts, or service access.
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