Residential Building Inspector B1 practice questions
229 free questions with answers and explanations.
- 151.A residential building inspector is reviewing plans for a new dwelling with an attached garage. The wall separating the garage from the dwelling is specified as a 1/2-inch gypsum board on the garage side. What is the minimum fire-resistance rating required for this wall?Building Planning and Life Safety
- 152.A residential building inspector is reviewing plans for a new single-family dwelling that includes an under-stair storage area. This area is enclosed and located beneath a required exit stairway. What is the minimum fire-resistance rating required for the enclosure walls and ceiling of this storage area?Building Planning and Life Safety
- 153.A residential building inspector is performing a final inspection of a newly constructed single-family home. The plans indicate that the attic access opening is located in a hallway closet. What is the minimum clear opening dimension required for this attic access?Building Planning and Life Safety
- 154.A residential building inspector is reviewing plans for a new single-family dwelling. The plans indicate a heating system that uses an unvented room heater. What is the maximum individual input rating allowed for an unvented room heater in a dwelling unit?Building Planning and Life Safety
- 155.A residential building inspector is reviewing plans for a new single-family dwelling. The plans indicate the installation of a new clothes dryer. What is the maximum allowable length for a straight rigid metal exhaust duct for this appliance?Building Planning and Life Safety
- 156.A residential building inspector is reviewing plans for a new home that includes a permanently installed unvented room heater. What is the maximum allowable input rating for this unvented room heater?Building Planning and Life Safety
- 157.A residential building inspector is reviewing plans for a new single-family dwelling that includes a permanently installed solid fuel-burning appliance. What is the minimum required distance from the top of a chimney to the point where it passes through the roof when the chimney is located less than 10 feet from the ridge?Building Planning and Life Safety
- 158.An inspector is reviewing the plans for a new residential dwelling. The plans indicate the installation of a solid-fuel-burning appliance. What is the minimum required clearance from the appliance to combustible materials on the side and rear, when tested and listed for 6-inch (152 mm) clearance?Building Planning and Life Safety
- 159.An inspector is reviewing a proposed residential deck that will be attached to a dwelling. The deck ledger board will be attached to the band joist of the dwelling. What is the minimum diameter of lag screws or bolts required for attaching the ledger board where the joist depth is 2x10?Building Planning and Life Safety
- 160.An inspector observes a newly installed asphalt shingle roof with a pitch of 3:12. What is the minimum headlap required for the asphalt shingles on this roof according to the IRC?Roof-Ceiling Construction
- 161.An inspector is evaluating the installation of a new roof covering. The roofing contractor has installed a continuous ridge vent system. What is the minimum net free ventilating area required for attic ventilation, expressed as a ratio of ceiling area to vent area, when both soffit and ridge vents are provided?Roof-Ceiling Construction
- 162.A residential building inspector is reviewing plans for a new three-story townhouse dwelling. The plans indicate that the interior walls separating individual townhouses will be constructed as fire separation walls. What is the minimum fire-resistance rating required for these walls?Building Planning and Life Safety
- 163.A residential building inspector is reviewing plans for a new single-family dwelling that includes a stairway. The plans indicate the stairway will have a uniform riser height. What is the maximum variation in riser height permitted between any two risers in the same flight of stairs?Building Planning and Life Safety
- 164.A residential building inspector is reviewing plans for a new single-family dwelling that includes an emergency escape and rescue opening (egress window) in a basement bedroom. The window well serving this opening must have a minimum horizontal projection. What is the minimum horizontal projection required for a window well serving an egress window?Building Planning and Life Safety
- 165.A residential building inspector is reviewing plans for a new single-family dwelling that includes a permanently installed automatic fire sprinkler system. What is the minimum required duration of water supply for this system?Building Planning and Life Safety
- 166.An inspector is reviewing the installation of a factory-built fireplace. What is the minimum required clearance from the sides and rear of the fireplace to combustible materials?Public Safety and Special Construction
- 167.A homeowner is constructing a new deck that will be attached to the dwelling. The deck is designed to support a uniform live load of 40 psf. What is the minimum ground clearance required for untreated wood joists supporting the deck?Public Safety and Special Construction
- 168.An inspector is reviewing the construction of a masonry chimney serving a wood-burning fireplace. What is the minimum wall thickness required for the masonry of the chimney to be considered solid (not hollow or block with voids)?Public Safety and Special Construction
- 169.An inspector is evaluating a ramp that provides an accessible route to a dwelling. The ramp has a rise of 24 inches (610 mm). What is the minimum required length of the ramp to meet the maximum allowable slope?Public Safety and Special Construction
- 170.An inspector observes a solid-fuel-burning fireplace in a newly constructed home. What is the minimum required thickness for the back and sidewalls of the firebox, if constructed of solid masonry?Public Safety and Special Construction
- 171.An inspector is evaluating a guard on a deck. The deck is located 32 inches above grade. What is the minimum required height for the guard, measured vertically from the leading edge of the tread or adjacent walking surface?Public Safety and Special Construction
- 172.A homeowner is installing a wood-burning stove and its chimney connector. What is the minimum required clearance from the single-wall metal chimney connector to combustible materials?Public Safety and Special Construction
- 173.A residential garage is being constructed with a floor that is required to be sloped to a drain. What is the minimum permissible slope for the garage floor?Public Safety and Special Construction
- 174.An inspector is evaluating a guard system for a deck that is 30 inches above the adjacent grade. What is the minimum required height for the guard?Public Safety and Special Construction
- 175.An inspector observes a solid masonry chimney that serves a wood-burning fireplace. What is the minimum required thickness of the chimney wall, if not lined with fireclay flue lining?Public Safety and Special Construction
- 176.An inspector is reviewing the clearances for a Type B gas vent. What is the minimum required clearance from the vent to combustible materials?Public Safety and Special Construction
- 177.A homeowner is installing a fence around a new swimming pool. What is the minimum height required for a barrier around a swimming pool?Public Safety and Special Construction
- 178.A residential dwelling has a solid-fuel-burning fireplace. What is the minimum required thickness for the hearth extension when the fireplace opening is 6 square feet (0.56 m²) or less?Public Safety and Special Construction
- 179.An inspector is examining the footings for a detached carport. What is the minimum depth required for the footings below the undisturbed ground surface?Public Safety and Special Construction
- 180.A ramp is being constructed as an accessible route to a dwelling. What is the maximum allowable slope for this ramp?Public Safety and Special Construction
- 181.An inspector is evaluating a deck that is attached to a dwelling. What is the minimum required size for a deck ledger board bolt, assuming the ledger is attached to a band joist with solid blocking between joists?Public Safety and Special Construction
- 182.A residential swimming pool is being installed, and a barrier is required to enclose the pool area. What is the maximum allowable vertical clearance between the bottom of the barrier and the finished grade or walking surface?Public Safety and Special Construction
- 183.An inspector is evaluating a stairway that serves as the primary egress from a dwelling unit. What is the maximum allowable riser height for any step in this stairway?Public Safety and Special Construction
- 184.An inspector is checking a newly installed wood stove and its single-wall metal chimney connector. What is the minimum clearance required from combustible materials for this connector?Public Safety and Special Construction
- 185.An inspector is evaluating a stairway for a residential dwelling. The stairway consists of three risers and four treads. What is the minimum required headroom clearance above the stair treads?Public Safety and Special Construction
- 186.A floor system utilizes wood I-joists. The building plans include blocking between the I-joists at the ends and at intermediate supports. What is the primary purpose of this blocking?Floor Construction
- 187.A builder is constructing a floor system where the subfloor will be 3/4-inch oriented strand board (OSB) with tongue-and-groove edges. What is the maximum allowable spacing for floor joists when using this subfloor material, according to the IRC?Floor Construction
- 188.A floor system utilizes a combination of 2x10 wood joists and 3/4-inch plywood subflooring. To prevent squeaks and improve the composite action between the subfloor and joists, what adhesive application is typically required by code, in addition to fasteners?Floor Construction
- 189.A residential floor assembly includes an underlayment layer over the subfloor. What is the primary purpose of installing an underlayment, particularly when finishing with resilient flooring such as vinyl or linoleum?Floor Construction
- 190.An inspector is reviewing plans for a new single-family dwelling. The floor joists are 2x10 lumber spaced at 16 inches on center. What is the maximum clear span allowed for these joists when supporting a live load of 40 psf and a dead load of 10 psf, assuming No. 2 Spruce-Pine-Fir (SPF) grade lumber?Floor Construction
- 191.An inspector is evaluating a floor assembly in a residential basement. The plans indicate the use of a concrete slab-on-ground over a vapor retarder. What is the minimum thickness required for the concrete slab for habitable spaces?Floor Construction
- 192.A contractor is installing a wood floor system for a residential addition. The plans call for 2x10 joists spanning 14 feet (4.27 m). The building code requires a minimum bearing length for joists on wood or metal supports. What is the minimum bearing length required for these joists?Floor Construction
- 193.An inspector is reviewing plans for a new residential structure where the floor system includes a girder supporting multiple floor joists. The plans specify a built-up wood girder consisting of three 2x10 members. According to the IRC, what is the minimum number of continuous rows of nails required to connect these members together?Floor Construction
- 194.A residential building inspector is examining a floor system that uses steel C-joists. The plans indicate that the joists are 8 inches (203 mm) deep. For proper lateral support and to prevent rotation, what is the maximum spacing required for bridging or blocking between these C-joists?Floor Construction
- 195.A floor assembly utilizes steel C-channel joists. Which of the following statements is true regarding the spanning capabilities of cold-formed steel floor joists compared to similarly sized wood joists?Floor Construction
- 196.A residential structure has an unconditioned crawl space below a heated floor. The floor assembly consists of wood joists and a subfloor. To prevent moisture migration and heat loss, where should the vapor retarder be installed in this floor assembly?Floor Construction
- 197.A builder is installing a concrete slab-on-ground for a garage. The plans specify a 4-inch thick slab. What is the minimum compressive strength required for this concrete at 28 days, according to the IRC?Floor Construction
- 198.A residential concrete slab-on-ground is being constructed. To control cracking, isolation joints are required. Where should an inspector typically expect to see isolation joints placed?Floor Construction
- 199.An inspector observes a solid wood floor joist that has a notch cut into its top edge. The notch is located at the mid-span of the joist and has a depth equal to 1/4 of the joist's depth. What is the appropriate action for the inspector regarding this notch?Floor Construction
- 200.During an inspection of a floor system utilizing I-joists, the inspector observes several holes drilled through the web of the I-joists for plumbing lines. What is the most critical factor an inspector must verify regarding these holes?Floor Construction