Technical Measurements Flashcards

About how much concrete fills one cylindrical pier that is 12 inches in diameter and 10 ft deep?

Answer: 0.29 cubic yards

π x 0.5² x 10 ≈ 7.85 cubic feet, and 7.85 / 27 ≈ 0.29 cubic yards.

How many cubic yards of gravel are needed to cover 3,000 sq ft to a depth of 6 inches?

Answer: 55.6 cubic yards

3,000 x 0.5 = 1,500 cubic feet, and 1,500 / 27 ≈ 55.6 cubic yards.

A 12 ft x 14 ft room has one 3-ft door opening. How many linear feet of baseboard are needed, with no waste?

Answer: 49 linear ft

The perimeter is 2 x (12 + 14) = 52 ft, minus the 3-ft door = 49 ft.

What is the approximate slope factor (pitch multiplier) for a 12/12 roof, used to turn plan area into actual roof area?

Answer: 1.414

√(12² + 12²) / 12 = √2 ≈ 1.414.

A benchmark has an elevation of 100.00 ft. With a builder's level, the backsight on the benchmark reads 4.50 ft and the foresight on point A reads 6.25 ft. What is the elevation of point A?

Answer: 98.25 ft

Height of instrument = 100.00 + 4.50 = 104.50, and 104.50 − 6.25 = 98.25 ft.

In standard US window and door schedules, a rough opening listed as 36 x 48 means:

Answer: 36 inches wide by 48 inches high

By convention, width is listed first and height second.

How many 4x8 sheathing panels are needed to cover 1,600 sq ft of roof, before waste?

Answer: 50

1,600 / 32 sq ft per panel = 50 panels.