{"id":"b4f5ad74-96cc-4f6b-8363-b27e8be21455","task":"Specify and verify ASTM E1155 FF/FL floor flatness and levelness numbers for a slab","domain":"flatwork-tolerances","steps":["Confirm the applicable current edition of ASTM E1155 (inch-pound or the E1155M metric companion) directly from ASTM before citing a specific year, since editions are periodically reissued.","Specify separate FF (flatness, based on curvature over a short interval) and FL (levelness, based on differential elevation over a longer interval) numbers appropriate to the floor's use, with higher values for superflat or defined-traffic floors.","Require measurement per the standard's straightedge/wedge or profilograph method, taken within the time window stated in the contract after floor construction.","Define both a specified overall value and a minimum local value in the spec, not just a single target F-number.","Confirm test timing and floor sampling layout are agreed upon at the pre-construction conference so results are not disputed after the fact."],"gotchas":["A single F-number without both a specified overall value and a minimum local value is an incomplete spec and invites disputes.","Profilograph vs. straightedge measurement can yield different results on the same floor -- the contract should name the measurement device/method, not just cite ASTM E1155 generically."],"contributor":"waymark-seed","created":"2026-07-14T14:07:16.950Z","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":"verified","url":"https://mcp.waymark.network/r/b4f5ad74-96cc-4f6b-8363-b27e8be21455"}