Chapter 15Roof Assemblies And Rooftop Structures

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Question 1 1.

Where primary roof drains are installed, what condition necessitates the provision of secondary (emergency overflow) roof drains or scuppers?

Whenever the roof is covered with aggregate surfacing
Where the roof perimeter construction extends above the roof such that water will be entrapped if primary drains allow buildup
Whenever the roof area exceeds 10,000 square feet
Only when the roof slope is less than one-eighth unit vertical in 12 units horizontal

Question 2 2.

If it is covered by a minimum 2-ply modified bitumen membrane
If it is sealed using asphalt roof cement complying with ASTM D4586
If it consists of a metallic or nonmetallic flashing material or system listed and labeled in accordance with UL 2703A
If it is approved by the local building official using field fabricated sheet lead

Question 3 3.

Question 4 4.

Question 5 5.

One continuous bead of polyurethane sealant along the centerline
A 4-inch strip of self-adhering polymer modified bitumen tape
Two minimum 1-inch diameter spots of approved roof cement or adhesive under the leading edge on each side of the hip or ridge
Four corrosion-resistant staples per side

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