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IRC Sample Questions and Answers. Chapter 1 Answer- Scope and Administration Chapter 2 Answer- Definitions Chapter 3 Answer- Building Planning Chapter 4 Answer- Foundations Chapter 5 Answer- Floors
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Chapter 1 Answer- Scope and Administration Chapter 2 Answer- Definitions Chapter 3 Answer- Building Planning Chapter 4 Answer- Foundations Chapter 5 Answer- Floors Chapter 6 Answer- Wall Construction Chapter 7 Answer- Wall Covering Chapter 8 Answer- Roof ceiling Construction Chapter 9 Answer- Roof Assemblies Chapter 10 Answer- Chimneys and Fireplaces Chapter 11 Answer- {Re} Energy Efficiency Chapter 12 Answer- Mechanical Administration Chapter 13 Answer- General Mechanical System Requirements Chapter 14 Answer- Heating and Cooling Equipment and Appliances Chapter 15 Answer- Exhaust Systems Chapter 16 Answer- Duct Systems Chapter 17 Answer- Combustion Air Chapter 18 Answer- Chimneys and Vents Chapter 19 Answer- Special Appliances, Equipment and Systems Chapter 20 Answer- Boilers and Water Heaters Chapter 21 Answer- Hydronic Piping Chapter 22 Answer- Special Piping and Storage Systems Chapter 23 Answer- Solar Energy Systems
Chapter 24 Answer- Fuel Gas Chapter 25 Answer- Plumbing Administration Chapter 26 Answer- General Plumbing Requirements Chapter 27 Answer- Plumbing Fixtures Chapter 28 Answer- Water Heaters Chapter 29 Answer- Water Supply and Distribution Chapter 30 Answer- Sanitary Drainage Chapter 31 Answer- Vents Chapter 32 Answer- Traps Chapter 33 Answer- Storm Drainage Chapter 34 Answer- General Requirements Chapter 35 Answer- Electrical Definitions Chapter 36 Answer- Services Chapter 37 Answer- Branch Circuit and Feeder Requirements Chapter 38 Answer- Wiring Methods Chapter 39 Answer- Power and Lighting Distribution Chapter 40 Answer- Devices and Luminaires Chapter 41 Answer- Appliance Installation Chapter 42 Answer- Swimming Pools Chapter 43 Answer- Class 2 Remote-control, Signaling and Power limited Circuits What is the nominal thickness of a ridge board? (page 378 R802.3) Answer- 1 inch How many jack studs will be required for a 2 - 2 x 12 header in an interior bearing wall supporting one floor only, building width of 28', and a span of 7'-0"? (page 123 - table R502.5(2)) Answer- 2 jack studs will be required
What is the maximum hole that may be cut in a 2 x 12 nominal floor joist? (page 120 R502.8.1) Answer- 4" What size strap is required if a top plate is notched more than 50% of its width? (page 160 - figure R602.6.1 - R602.6(2)) Answer- 16 gage in thickness and 1 1/2" wide The end of a wood joist must bear on a wood beam by at least inches? (page 120 R502.6) Answer- 1 1/2" Concrete gains most of its strength in how many days? (page 74 - table 402.2 footnote A) Answer- 28 days In what section of the span of a floor joist is it NOT permitted to cut a notch? (page 123 - figure R502.8) Answer- Middle third What material is required for the door of an ash dump cleanout? (page 453 R1001.2.1) Answer- Ferrous metal or masonry A cricket is required when the width of a chimney is greater than inches (page 461 irc 10003.20) Answer- 30" In what direction must the access gate of a pool swing? (page 830 AG105.2.8) Answer- Outwards What is the minimum ceiling height over a bathtub? (page 54 R305.1 - Exception 2) Answer- 6'-8" What is the maximum unsupported height of a pier consisting of 12" x 16" hollow core blocks filled with Type S mortar? (page 265 R606.6) Answer- 120"
What is the minimum width of a stairway? (page 60 R311.7.1) Answer- 36" In Virginia, what is the stair riser height and tread depth? (page 60 R317.7.5.1 & 2) Answer- 8 1/4" and 9" (this is a Virgina uniform statewide building code change) What size window is required in a bathroom if there is no mechanical ventilation? (page 53 R303.3) Answer- 3 square feet What is the minimum width of a hallway? (page 60 R311.6) Answer- 3 ' In Virgina, what are the R Value insulation requirements for the ceiling, wall, and floor? (page 481 - table N1102.1 - Use climate zone 4 except marine) Answer- 49, 20, 19 The under floor space vents must be covered with material with a least dimension of? (page 111 R408.2) Answer- 1/4" What is the maximum slump of concrete placed in removable forms? (page 97 R404.1.2.3.4 Answer- 6" The end joints of double top plates must be offset at least? (page 157 R602.3.2) Answer- 24" What is the required clearance of wood siding from the ground before it is required to be pressure treated?] (page 66 R317.1.5) Answer- 6" What is required to support brick veneer above openings in exterior walls? (page 371 R703.7.3) Answer- Lintel What is the minimum stroke width of site address numbers? (page 68 R319.1) Answer- 1/2" What is the thickness of flashing?
(page 62 R312.1.2) Answer- 36" Handrails adjacent to a wall shall have a space of not less than inches between the wall and the handrail (page 61 R311.7.8.2) Answer- 1 1/2" Compressible soil shall not be used as (page 73 R401.4.2) Answer- Fill What is the minimum thickness of a spread footing? (page 74 R403.1.1) Answer- 6" In Virginia, what is the minimum specified compressive strength in psi of concrete in a basement wall exposed to weather? (page 74 - table R402.2 - use the severe column for Virginia) Answer- 3, What is the minimum depth of a footing? (page 79 R403.1.4) Answer- 12" What is the dimension of the air space between masonry veneer and the wall sheathing? (page 373 - figure R703.7.4.2) Answer- 1" What is the minimum number of anchor bolts required for a wall section? (page 79 R403.1.6) Answer- 2 What type of fastener is required in a wood foundation knee wall? (page 73 R402.1.1) Answer- Stainless steel What is the presumptive load bearing value of sand? (page 73 - table R401.4.1) Answer- 2,000 PSF What is the thickness of the vapor retarder placed above the base course and the concrete floor slab? (page 144 R506.2.3) Answer- 6 MIL What size nail is used to secure the collar tie to the rafter? (page 150 - table R602.3(1) Line 4) Answer- 10 D