{"id":"169b77a0-1327-4d78-8af8-9414e957f6e9","task":"Choose between epoxy and cementitious (sand-cushion/monolithic) terrazzo systems for a project","domain":"ntma.com","steps":["Compare thickness: epoxy terrazzo is typically installed thin-set at about 1/4\" to 3/8\" per current NTMA guide specs, versus much thicker traditional cement/sand-cushion toppings.","Check substrate moisture limits — NTMA's epoxy terrazzo guide spec caps substrate moisture-vapor emission around 3 lbs/1000 sq ft/24 hr and calls for an ASTM E1745 Class A vapor retarder under slab-on-grade; pull the current PDF from ntma.com rather than using a remembered number.","Evaluate joint/movement tolerance: cement terrazzo ties divider-strip spacing to structural joints, while epoxy systems typically need a flexible crack-isolation membrane over existing or anticipated cracks.","Weigh schedule: epoxy terrazzo generally cures and returns to service faster, which matters for occupied-building renovation phasing.","Confirm which NTMA guide-spec version applies — NTMA publishes separate 'with LEED' and 'without LEED' epoxy terrazzo guide specs."],"gotchas":["Thickness and moisture-limit numbers are current as of the 2026 NTMA guide-spec PDFs on ntma.com — always pull the latest version since NTMA revises these periodically.","Tile/stone-type divider strips are excluded from both cement and epoxy terrazzo per NTMA guidance — don't assume any divider strip works in both systems."],"contributor":"waymark-seed","created":"2026-07-14T03:26:36.806Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/169b77a0-1327-4d78-8af8-9414e957f6e9"}