NCIDQ IDFX Practice Questions (2026) — Free Sample Questions with Answers

Answer: B

Office on the top wall: With north to the right, the top wall faces west and gets low afternoon sun and glare.

Office on the right wall: Correct. The north arrow points to the right, so this office’s window faces north and receives steady, diffuse daylight with little direct sun, which is ideal for studio work.

Office on the bottom wall: With north to the right, the bottom wall faces east and gets low morning sun.

Office on the left wall: With north to the right, the left wall faces south and gets the most direct sun.

Always read the north arrow rather than assuming north is up; in the Northern Hemisphere, north glazing gives the most even, glare-free daylight.

Answer: B

Have the demolition crew remove the tile dry and bag it: Removing suspect material before it is tested can release fibers; the hazard must be identified first.

Have a qualified inspector test the tile and adhesive: Correct. Vinyl tile of that size and black adhesive from this era are classic suspect asbestos-containing materials, so they must be sampled and tested by a qualified inspector before renovation disturbs them.

Specify a self-leveling underlayment directly over the tile: Covering may later be an option, but choosing it before testing skips the identification step and ignores what demolition elsewhere may disturb.

Note the tile as “existing to remain” on the finish plan: A drawing note does not identify or manage a possible hazard; the material still has to be tested.

Suspect materials in an older building (vinyl tile, mastic, pipe insulation, plaster) are sampled by a qualified inspector before demolition; the schedule does not override that step.

Answer: C

Specifying LED lighting with daylight-responsive controls: This lowers operational energy use, not the embodied carbon of the materials installed.

Choosing carpet tile with a high recycled content: Recycled content helps, but it affects one product; the new material is still manufactured and installed.

Reusing existing partitions, ceilings and furniture: Correct. Material that is reused does not have to be manufactured, shipped or installed again, so reuse avoids the most embodied carbon of these choices.

Installing low-flow plumbing fixtures in the restrooms: Low-flow fixtures save water in operation; they do little for the embodied carbon of the fit-out.

Embodied carbon comes from making, transporting and installing materials; in interiors the largest savings come from reusing what already exists and buying less new material.

Answer: B

Outside, beside the entrance doors: Outside the doors, visitors are not yet at the point where they must choose a route and would have to remember the directions; an exterior sign is better used to identify the building.

Lobby wall opposite the entrance: Correct. This wall faces visitors as soon as they enter and sits at the first decision point, where they must choose the west or east corridor, so the directory is seen before the choice is made.

Middle of the west corridor: By this point visitors have already chosen the west route; anyone heading for Clinics or Pharmacy has gone the wrong way.

Far end of the east corridor: This is past the decision point and out of view from the lobby, so it cannot guide people choosing a route.

Place directory and directional signs at decision points, in the line of sight of people arriving, before they have to choose a route.

Answer: A

Knee and leg clearance under a dining counter: Correct. Clearances must fit the largest users, so knee and leg space is sized from 95th-percentile data.

Height of the highest shelf staff must reach: Reach dimensions are set by small users (5th percentile) so nearly everyone can reach.

Distance from the counter edge to a wall switch: A reach distance; sizing it for large users would put the switch out of reach for smaller ones.

Mounting height of a wall-hung coat hook: Another reach dimension, governed by smaller users rather than the 95th percentile.

Design clearances for large users (95th percentile) and reaches for small users (5th percentile) to accommodate the widest range of people.

Answer: (1) Infant room, (2) Director’s office, (3) Kitchen, (4) Toddler room

A bubble diagram translates the adjacency matrix into graphic relationships; identify each space by its unique set of primary and secondary connections.

Answer: B

Small device nearest the counter: The light switch at 46 in is within the 15–48 in unobstructed reach range.

Large wall-mounted unit, second from the counter: Correct. The paper towel dispenser lever (bold line) is at 54 in AFF, above the 48-in maximum for an unobstructed reach (ICC A117.1-2017 §308). It must be lowered so its operable part is no higher than 48 in.

Small device, third from the counter: The thermostat at exactly 48 in meets the maximum; 48 in is allowed.

Low device at the far right: The receptacle at 18 in is above the 15-in minimum, so it is within the reach range.

Check every operable part shown on an elevation against the 15–48 in unobstructed reach range; a dimension of exactly 48 in complies.

Answer: B

It fails, because it is longer than the 20-ft limit: This applies the general limit but misses the exception: 23 ft is less than 2.5 × 10 ft = 25 ft.

It complies, because it is under 2.5 times its width: Correct. 2.5 × 10 ft = 25 ft, and the 23-ft alcove is shorter than that, so no dead-end limit applies (IBC 2021 §1020.5).

It complies, because the 50-ft limit applies to it: The 50-ft limit requires a fully sprinklered building; this building has no sprinklers.

It fails, because Group B allows no dead ends: Group B allows dead ends within the stated limits; dead ends are not banned outright.

Before applying the 20-ft or 50-ft dead-end limit, check whether the dead end is shorter than 2.5 times its least width; if it is, no limit applies.

Answer: A

Open workstations at the perimeter, enclosed rooms near the core: Correct. Low open workstations along the glass let daylight and views reach the most people, and enclosed rooms near the core (ideally with glass fronts) do not block the light.

Private offices on the window wall, workstations near the core: Perimeter private offices give the daylight to a few people and block it from the open workstations behind them.

Tall storage walls parallel to the glass between work zones: Full-height storage parallel to the window wall cuts daylight and views off from everything behind it.

Conference rooms on the window wall, workstations near the core: Rooms used only part of the day take the best daylight while full-time workstations sit in the darkest zone.

To share daylight and views, put low, open, full-time work areas at the perimeter and enclosed or tall elements toward the core.

Answer: A

Keep durable public-area finishes and use cheaper alternates in support rooms: Correct. Spending follows traffic and visibility. Durable finishes stay where wear and client impressions are highest, and the cost reductions come from low-traffic support rooms without affecting life safety.

Reduce the cost of every finish line item by the same percentage across the project: An across-the-board cut downgrades the high-traffic areas that need durability as much as the back rooms that do not, which raises long-term maintenance cost.

Substitute Class C wall finishes in corridors where Class B is required: This trades code compliance for savings. The required finish class is a life-safety minimum that cannot be value-engineered away.

Delete the walk-off flooring at the building entrances: Walk-off flooring controls tracked-in water and soil. Deleting it raises slip risk and wear on the adjacent finishes.

Value-engineer finishes by space priority (traffic, visibility, durability) and never below code minimums or HSW-critical features.

Answer: C

High-gloss sheet flooring with a dark border at each doorway: Gloss produces glare, which can look like standing water, and a dark border at a doorway can read as a hole or step, causing hesitation or falls.

Bold geometric carpet to help residents find their rooms: Bold, high-contrast patterns can be perceived as objects or changes in level. Use cues at the doors, not on the floor, for wayfinding.

Matte flooring with minimal pattern that contrasts with the walls: Correct. A matte, low-pattern floor avoids glare and misread patterns, and contrast between floor and wall helps residents perceive edges and boundaries.

Flooring matched to the wall color and light reflectance value: When floor and wall have the same color and LRV, the edge where they meet disappears, so residents lose depth and boundary cues.

For dementia and low vision, use matte, low-pattern floors in a consistent tone, and put contrast at the planes and edges people need to see, such as the floor-to-wall line and handrails.

Answer: Freestanding lounge chairs in the waiting room: FF&E; Nurses' station counter anchored to the floor with integrated power: Millwork (construction); Wall-hung upper and lower cabinets in the staff break room: Millwork (construction); Movable conference table with a plug-in power module: FF&E; Built-in banquette bench fastened to the wall: Millwork (construction); Mobile pedestal files under the workstations: FF&E

Items attached to the building or wired into it are construction (millwork). Movable or freestanding items, including those that plug in, are FF&E.

Answer: C

F-2 carpet tile in the corridors: At 0.27 W/cm² F-2 is a Class II floor covering, which more than satisfies a sprinklered Group B corridor (DOC FF-1 would be enough).

W-1 vinyl wallcovering on the corridor walls: A flame spread of 20 is Class A, better than the Class C required in a sprinklered Group B corridor, and smoke 150 is under 450.

W-2 wood veneer panels in the exit stairway: Correct. A flame spread of 95 falls in Class C (76–200), but walls of an interior exit stairway in a sprinklered Group B building of three or more stories need at least Class B (26–75) per IBC 2021 Table 803.13. The panels need a fire-retardant-treated veneer or another product tested at 75 or less.

D-1 drapery in the conference rooms: D-1 passes NFPA 701, the flame-propagation test that applies to curtains and draperies, so it is acceptable.

Convert the ASTM E84 flame spread index to its class (A 0–25, B 26–75, C 76–200), then compare it with the class the code table requires for that location and sprinkler condition.

Answer: C

First segment from the left: At 44 in, this segment exceeds the 36 in general minimum.

Narrow point between the two dark blocks: This 32 in pinch is only 18 in long, within the 24 in maximum allowed for a reduction to 32 in, so it complies.

Segment between the two shaded blocks: Correct. At 34 in, this segment is below the 36 in minimum, and at 8 ft long it is far longer than the 24 in allowed for a reduced width, so the display cases must move apart.

Last segment on the right: At 38 in, this segment exceeds the 36 in minimum.

Accessible routes need 36 in clear; they may narrow to 32 in only for 24 in of length at a time, with reduced segments at least 48 in apart.

Answer: A

Wall at the far end of the dashed line: Correct. This wall terminates the entry axis, so it is directly in every visitor’s line of sight on arrival; placing the feature here uses emphasis and axis to create an immediate focal point.

Wall beside the entry doors: This wall is behind visitors as they walk in, so they would see it only when leaving.

Left side wall: The side wall is in peripheral vision; visitors notice it only after turning toward the lounge.

Back wall of the upper-right room: A wall inside a private office is not visible from the reception area at all.

Place focal elements where a primary axis or line of sight ends; the termination of the entry view is the strongest position for emphasis.

Answer: D

Upper-left corridor stub: At 18 ft this stub is within the 20 ft limit, so it complies.

Lower-left corridor stub: At 14 ft this stub is well within the 20 ft limit.

Upper-middle corridor stub: At exactly 20 ft this stub meets the limit; the limit is a maximum, so 20 ft complies.

Right end of the main corridor: Correct. East of the Exit 2 corridor, occupants can travel only one way for 30 ft, which exceeds the 20 ft dead-end limit. The 50 ft limit is not available: the building is not sprinklered, and Group A is not on the 50 ft list in any case. Shorten the run to 20 ft or less or connect it to an exit.

Check every corridor stub, including the run beyond the last exit connection; in a nonsprinklered building, or any Group A building, the dead-end limit is 20 ft.