ADA and Building-Code Surfaces

The physical and dimensional condition of what exists: route width and continuity, changes in level at thresholds and transitions, ramp slopes and landings, handrail geometry, and the surface condition along the route, measured against the requirements applicable to that element.

No. Whether a design professional met the professional standard of care in producing a design requires a licensed design professional of that discipline and is referred out. What is offered is the as-built and as-maintained condition measured against the applicable requirements.

They can impose different limits on the same element, and the governing figure depends on the element, its location and the code edition in force when the work was permitted. The as-found dimension is measured against the requirements applicable to that location.

Frequently. Matting laid across a route, seasonal equipment stored in the clear width, a settled joint left unrepaired, or snow cleared to the edge of a route rather than off it can each render a compliant route unusable. Those are documented against both the requirement and the practice.

Running slope and cross slope measured along the actual path of travel, landing dimensions at the top and bottom, edge protection, handrail geometry, and the surface condition and drainage. As-built ramps often differ from the drawing, which is why measurement on site matters.

Which requirements apply, and to what extent, is a legal question that depends on the work history and the jurisdiction. The technical contribution is establishing precisely what exists, what was altered and when, and how the as-built condition compares to the requirement in force for that work.