Chapter 4

Question 1

Measuring the gap under a 10ft straightedge is one way of determining:
A. floor flatness
B. floor levelness
C. floor flatness and levelness
D. floor flatness and levelness F-numbers

Answer 1

A. Floor Flatness

Question 2

The gap under the straightedge should be measured at:
A. left end where there is gap
B. Middle board between 2 higher spots
C. right end where there is gap
D. all 3 and take an average

Answer 2

B.

Question 3

The F-number system is one way of determining:
A. floor flatness
B. floor levelness
C. floor flatness and levelness
D. possibility of a floor covering failure

Answer 3

C. floor flatness and levelness

Question 4

FF numbers are indicators of floor surface smoothness or flatness. T or F?

Answer 4

True

Question 5

FL numbers are indicators of levelness or tilt of the floor surface. T or F?

Answer 5

True

Question 6

Which of the following finishing operations affect floor flatness:
A. floating
B. restraightening
C. troweling
D. all of the above

Answer 6

D. all of the above

Question 7

A floor with the surface profile of FF=48, FL=16 is:
A. flat and level
B. level but not flat
C. flat but not level
D. likely to be slippery

Answer 7

C. Flat but not level

Question 8

A 3in slump concrete that sets very fast is most likely to result in:
A. Little finishing effort needed to get a high FF number
B. a lot of finishing effort needed to get a high FF number.
C. a floor surface with craze cracks
D. a floor with high abrasion resistance

Answer 8

B. a lot of finishing effort needed to get a high FF number

Question 9

F-number testing should preferably be done within _____ hours after concrete placement, but never later than ______ hours after placement.

Answer 9

24; 72

Question 10

A floor with FF number of 40 is twice as flat as a floor with an FF number of 20. T or F?

Answer 10

True

Question 11

Floor Flatness measurements take more than 72 hours after concrete placement are the best measure of a finishers skills. T or F?

Answer 11

False

Question 12

The highest quality of levelness can be achieved by using hard edge forms spaced:
A. 10 to 20ft apart
B. 15 to 30ft apart
C. 20 to 40ft apart
D. At least 50ft apart

Answer 12

A. 10 to 20ft apart