Roof Sailing Roof Flashing and Waterproofing

Question 1

What material is most commonly used for roof step flashing in the US?

Accepted Answer

Galvanized steel or aluminum

Answer

Copper

Answer

Lead

Answer

PVC

Question 2

How is step flashing correctly installed along a sidewall?

Accepted Answer

Individual L-shaped pieces, one per shingle course, interwoven with shingles

Answer

One continuous piece bent over the entire wall

Answer

Applied only at the bottom of the wall

Answer

Installed only under the first three courses

Question 3

What is counter flashing and where is it used?

Accepted Answer

Metal cap flashing embedded in masonry walls that laps over base flashing

Answer

Flashing installed under shingles at valleys

Answer

Flashing applied at ridges

Answer

The bottom layer of valley flashing

Question 4

At what minimum height should flashing extend up a vertical wall adjacent to a roof surface?

Accepted Answer

4 inches

Answer

1 inch

Answer

2 inches

Answer

8 inches

Question 5

What is the purpose of a cricket (saddle) behind a chimney?

Accepted Answer

Diverting water and debris around the chimney and preventing ponding

Answer

Providing an anchor for the antenna

Answer

Adding structural support to the chimney

Answer

Providing ventilation behind the chimney

Question 6

Which valley flashing method is considered the most watertight?

Accepted Answer

Open valley with W-metal

Answer

Woven valley

Answer

Closed-cut valley

Answer

California valley