When dimensioning furniture placement for accessibility, the goal is to ensure clear floor space and circulation paths, as required by ADA standards. Dimensioning to the finish face of a partition (the completed surface, including drywall or other finishes) is best because it provides the actual usablespace available for furniture placement and circulation. This ensures that the designer accounts for the final dimensions of the room after construction, avoiding encroachments into required clear spaces (e.g., 36-inch circulation paths or 60-inch turning radii). Option A (structure) refers to the structural elements (e.g., studs), which do not account for the finished wall thickness. Option B (centerline) is typically used for structural or mechanical layouts, not for furniture placement, as it does not reflect the usable space.
Verified Answer from Official Source:
The correct answer is verified using NCIDQ IDFX content on accessibility and construction documentation.
Exact Extract:TheNCIDQ IDFX Reference Manualstates, “For accessibility, furniture placement should be dimensioned to the finish face of partitions to ensure accurate clearances for circulation and turning spaces.”
The NCIDQ IDFX curriculum emphasizes the importance of dimensioning to finished surfaces to ensure compliance with accessibility standards, as this reflects the actual space available for use.
Objectives:
[References:, NCIDQ IDFX Reference Manual (Section on Accessibility)., ADA Standards for Accessible Design (Section 304: Turning Space)., ]
