Editing Openai/6928dffa-2c40-800e-b585-2520d50a2cbb (section)

=== Quick decision checklist ===
* Want fast, clean install for fence/mailbox/sign → Foam (if product rated for that use). Fast 2K<ref>{{cite web|title=Fast 2K|url=https://fast2k.com/|publisher=Fast 2K|access-date=2025-11-28}}</ref>
* Need code-compliant, load-bearing footing (deck posts, structural posts) → Concrete OR an ICC-ES-approved foam deck anchor (verify PDS/ESR). Fast 2K<ref>{{cite web|title=Fast 2K|url=https://fast2k.com/|publisher=Fast 2K|access-date=2025-11-28}}</ref>
* In heavy frost-heave soils or poor drainage → prefer concrete footings below frost depth; if using foam, design to mitigate heave and drainage.

If you tell me what you’re setting (4×4 fence post? 6×6 deck post? mailbox? your zip code or frost depth?), I’ll give a quick recommendation tailored to that use and point you to the exact Product Data Sheet(s) you should read before deciding.