International Residential Code Exam Questions with Complete Solutions

What is the nominal thickness of a ridge board? - ANSWER-Not less than 1" How many jack studs will be required for a 2 - 2X12 header in an interior bearing wall supporting one floor only, building width of 28', and a span of 7'0"? - ANSWER-2 jack studs supporting each end What is the maximum hole that may be cut in a 2 X 12 nominal floor joist? - ANSWER-4" (1/3rd the width) What size strap is required if a top plate is notched more than 50% of its width? - ANSWER-16 gauge thick and 1 1/2" wide The end of a wood joist must bear on a wood beam by at least __________ inches? - ANSWER-Not less than 1 1/2" Concrete gains most of its strength in how many days? - ANSWER-28 days In what section of the span of a floor joist is it NOT permitted to cut a notch? - ANSWER-Center 1/3rd What material is required for the door of an ash dump cleanout? - ANSWER-Ferrous Metal or Masonry A cricket is required when the width of a chimney is greater than __________ inches? - ANSWER-30" (and does not intersect the ridgeline) What is the minimum ceiling height above a bathtub? - ANSWER-6'8" What is the maximum unsupported height of a pier consisting of 12"X16" hollow core blocks filled with Type "S" mortar? - ANSWER-10 times their least dimension (10 X 12" = 120") What is the least outside circular diameter of a handrail? - ANSWER-not less than 1 1/4" (not greater than 2") Insulation shall have a smoke-developed index not to exceed? - ANSWER-450 From where must a smoke alarm draw its primary power? - ANSWER-From the building wiring What is the live load of an attic with habitable space? - ANSWER-30 psi