2015 IRC Exam 3 of 4 (49-72)

Question 1

49.  The minimum thickness of a concrete floor slab supported directly on the ground shall be not less than \_\_\_\_\_\_ in. 
(p149 - R506.1)
a.  3 
b.  3 ½ 
c.  4 
d.  4 ½

Answer 1

b. 3 ½

Question 2

50.  Fill dirt of earth under a concrete slab supporting a floor shall be compacted a maximum of\_\_\_\_\_\_ inches. 
(p149 - R506.2.1)
a.  2 
b.  4 
c.  6 
d.  8

Answer 2

d. 8

Question 3

51.  Plans call for a #6 rebar to be used in a footing. What is the nominal diameter of this bar? 
(p888)
a.  ½ inch 
b.  ¾ inch 
c.  7/8 inch 
d.  1 inch

Answer 3

b. ¾ inch

Question 4

52.  What grade of stud may not be used in the wall framing of the first floor shown in the drawing?
(p161 - R602.3.1)
a.  number 3 
b.  const. grade 
c.  number 1 
d.  utility grade

Answer 4

d. utility grade

Question 5

53.  The end joints of double top plates of an apartment building shall be offset at least \_\_\_\_\_\_ inches. 
(p161 - R602.3.2)
a.  12 
b.  36 
c.  48 
d.  60

Answer 5

c. 48

Question 6

54.  Given: Trusses are installed at 24 inches on center.  Wall studs are framed 24 inches on center.  What is the maximum distance a truss shall bear within the stud below? 
(p161 - R602.3.2)
a.  16 inches 
b.  12 inches 
c.  5 inches 
d.  no requirement

Answer 6

c. 5 inches

Question 7

55.  What is the minimum thickness of exterior plywood used for wall bracing if the stud spacing is 16 inches on center?
(p163 - Table R602.3.3) 
a.  5/8 inch 
b.  1/2 inch 
c.  3/8 inch 
d.  1/4 inch

Answer 7

c. 3/8 inch

Question 8

56.  A plumber bores a hole in a 2 x 4 non load-beaiing wall.  What is the maximum size of the hole? 
(p166 - R602.6)
a.  2 ½ inches 
b.  2 ¼ inches 
c.  2 inches 
d.  1 ¾ inches

Answer 8

c. 2 inches

Question 9

57.  What is the minimum size of board that may be used for a non-loading bearing header for an interior wall? 
(p166 - R602.7.4)
a.  2 X 4 
b.  2 x 6 
C.  2 X 8 
d.  2 x 10

Answer 9

a. 2 X 4

Question 10

58.  What size header would be required for an opening in an interior load-bearing wall if the opening is 4 feet 8 inches wide. 
(p171 - Table)
a.  (2) - 2 X 4 
b.  (2) - 2 x 6 
c.  (2) - 2 X 8 
d.  (2) - 2 x 10

Answer 10

c. (2) - 2 X 8

Question 11

59.  What is the minimum thickness of solid masonry that may be used in the wall when supporting a one story dwelling that is 9 feet tall? 
(p248 - R606.4.1)
a.  4 inches 
b.  6 inches 
c.  8 inches 
d.  10 inches

Answer 11

b. 6 inches

Question 12

60.  What is the maximum height a parapet wall can be if the minimum size of unreinforced hollow masonry block is used?
(p248 - R606.4.4)
a.  36 inches 
b.  30 inches 
c.  24 inches 
d.  12 inch

Answer 12

c. 24 inches

Question 13

61.  There shall be at least one metal tie for each \_\_\_\_\_ square feet of wall area when bonding a multi-wythe masonry wall together.
(p256 - R606.13.2.1)
a.  2 
b.  3½ 
c.  4 
d.  4½

Answer 13

d. 4½

Question 14

62.  What is the minimum lap splice of #4, 40,000 p.s.i. yield strength rebar? 
(p262 - Table R608.5.4)
a.  12 inches 
b.  16 inches 
c.  20 inches 
d.  30 inches

Answer 14

c. 20 inches

Question 15

63.  What is the maximum VERTICAL spacing of wall ties used to anchor masonry veneer to a wall?
(p358 - R703.8.4.1)
a.  24 inches 
b.  32 inches 
c.  48 inches 
d.  no requirement

Answer 15

b. 32 inches

Question 16

64.  What is the maximum spacing of nails where no adhesive is used for ½ inch gypsum board if applied to a ceiling? 
(p343 - Table R702.3.5)
a.  12 inches 
b.  8 inches 
c.  6 inches 
d.  4 inches

Answer 16

a. 12 inches

Question 17

65. Water resistive gypsum backing board shall not be used ______
    (p344 - R702.3.7.1)
    a. on ceilings if the framing does not exceed 12 inches on center.
    b. on bathroom walls.
    c. in showers
    d. saunas

Answer 17

d. saunas

Question 18

66.  What is the maximum length of a lintel that is 4 x 3 x 1/4 supporting masonry veneer where one story above exists?
(p357 - Table R703.8.3.1)
a.  4 feet 
b.  6 feet 
c.  8 feet 
d.  10 feet

Answer 18

c. 8 feet

Question 19

67.  The ridge board of roof framing shown in the drawing shall not be less than a \_\_\_\_\_\_\_
(p366 - R802.3)
a.  2 x 6 
b.  1 x 8 
c.  2 x 8 
d.  no requirement

Answer 19

b. 1 x 8

Question 20

68.  The ridge board used in roof framing shall not be less than \_\_\_\_\_\_ 
(p366)
a.  2 x 4 
b.  2 x 6 
c.  2 x 8 
d.  the cut end of the rafter

Answer 20

d. the cut end of the rafter

Question 21

69.  How far can a ceiling joist span if it must carry a live load of 10 pounds and you use a 2 x 6, 16 inches on center spacing, Hem-fir #1 wood species? 
(p367 - Table R802.4.1)
a.  14 feet 6 inches 
b.  15 feet 8 inches 
c.  16 feet 4 inches 
d.  17 feet 4 inches

Answer 21

d. 17 feet 4 inches

Question 22

70.  What is the minimum thickness and number of plys of Structural I wood structural panels applied parallel to supports that are 24 inches on center on the roof if it must support a total of 55 pounds per foot? 
(p480)
a.  1/2 in., 4 
b.  7/16 in., 3 
c.  19/32 in., 5 
d.  ¾, 6

Answer 22

c. 19/32 in., 5

Question 23

71.  What is the maximum span of plywood, if used on the roof, if it has a panel span rating of 32/16?
(p133 - Table R503.2.1.1.1)
a.  24 inches 
b.  32 inches 
c.  36 inches 
d.  48 inches

Answer 23

b. 32 inches

Question 24

72.  An enclosed attic of an office building built of wood trusses with 2400 square feet shall have a minimum of \_\_\_\_\_\_\_ ft. of free air ventilation and 50 percent of the venting is located at the ridge and 50 percent of the venting is located in the soffits? 
(number on exam / 300)
a.  5 
b.  8 
c.  16 
d.  20

Answer 24

b. 8