Aircrete

Niche Fill — Lightweight liftable decorative monolith — nothing commercial fills this niche

Best shape: Decorative, liftable/precast elements (arches, lintels, old-world accent pieces) · Tier: Novelty / niche

Oddity/accent tier only, never structural

Cement + water + detergent foam, no aggregate; compressive strength genuinely undocumented, engineer sign-off required for anything load-bearing

Verify: no reliable compression data exists anywhere — MM could generate its own via documented test pour