4-43. Which of the following inlet ventilation  systems  is  recommended for use on low-pitched flat roofs with overhangs? 1. Continuous  slot 2. Ridge 3. Louvered 4. Wall 4-44. What is the primary advantage of softwood  flooring  over  hardwood flooring? 1. Less dense 2. Lower cost 3. Improved  wear  resistance 4. Easier  to  maintain 4-45. Subfloor  boards  are  normally  laid over  joists  in  what  direction? 1. Parallel 2. Diagonal 3. Perpendicular 4-46. Building paper is used over subfloors  to  reduce 1. noise and dust only 2. dust and air flow only 3. air flow and noise only 4. all of the above 4-47. What  factor  usually  causes  cracks to appear in finish floors several months after the floor has been laid? 1. Expansion  of  subfloor  material 2. Absorption  of  moisture  after delivery 3. Poor nailing 4. Weak  floor  joists 4-48. At which of the following angles should nails be driven through the tongue  of  tongue-and-groove flooring? 4-49. How can you prevent splitting the 4-50. 4-51. 4-52. 4-53. tongue    when    nailing tongue-and-groove   flooring? 1. By using cut nails 2. By predrilling the nail holes 3. By  using  chisel-point  nails 4. By waxing the nail shanks A vapor barrier is installed under a concrete slab before it is poured. Is any further preparation required  for  the  later  installation of wood flooring. 1. Yes 2.  No What is the expansion allowance for hardboard  underpayment  when  laid next to a vertical surface? 1. 1/8 to 3/8 in. 2. 3/8 to 1/2 in. 3. 1/2 to 5/8 in. 4. 5/8 to 3/4 in. Nail  spacing  for  1/2-inch  plywood underpayment  should  not  exceed  what OC (a) edge and (b) field spacing? 1. (a)  4 in.  (b) 8 in. 2. (a)  5 in.  (b) 8 in. 3. (a)    6 in.    (b) 10 in. 4. (a)    8 in.    (b) 10 in. What is the result of too heavily applied  tile  adhesive? 1. Tile will not adhere 2. Adhesive  will  not  set 3. Ties  will  “telegraph” 4. Adhesive  will  bleed  between tile 1. 30° to 35° 2. 35° to 40° 3. 40° to 45° 4. 45° to 50° 23