Roof Sailing Knowledge 3

Question 1

What material is most commonly used for step flashing where a roof meets a vertical sidewall?

Accepted Answer

Copper or galvanized steel

Answer

Step flashing is cut from copper or galvanized steel and interwoven with each shingle course to redirect water away from the wall junction.

Question 2

What is the minimum recommended headlap for standard three-tab asphalt shingles?

Accepted Answer

3 inches

Answer

A minimum 2-inch headlap (often defaulting to a standard 3-inch exposure system) is recommended to prevent water infiltration between courses.

Question 3

Which condition makes a roof deck unsuitable for direct shingle application without repair?

Accepted Answer

Deck boards with gaps larger than 1/4 inch

Answer

Gaps larger than 1/4 inch between deck boards can cause shingles to crack or lose fastener hold, requiring repairs or a new overlay panel.

Question 4

In roofing, what does 'one square' of material cover?

Accepted Answer

100 square feet

Answer

One roofing square equals 100 square feet of roof surface, the standard unit used to calculate material quantities.

Question 5

What is the function of a cricket or saddle behind a chimney?

Accepted Answer

To divert water around the chimney and prevent pooling

Answer

A cricket is a small peaked structure built behind a chimney to redirect water flow and prevent debris accumulation at that intersection.

Roof Sailing Practice Test