Roof Sailing Roof Flashing and Waterproofing 1

Question 1

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

Accepted Answer

Galvanized steel or aluminum

Answer

Galvanized steel and aluminum are the most commonly used step flashing materials in US residential construction due to their corrosion resistance, affordability, and compatibility with asphalt shingles.

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

Step flashing consists of individual L-shaped metal pieces installed one per shingle course, with each piece overlapping the one below and tucked under the siding above to direct water onto the shingles.

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

Counter flashing is a second piece of flashing embedded into mortar joints of masonry walls (like chimneys) that overlaps the base flashing to create a two-part seal that allows independent movement.

Question 4

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

Accepted Answer

4 inches

Answer

Roofing codes generally require flashing to extend a minimum of 4 inches up any vertical surface to ensure wind-driven rain cannot force water behind the flashing.

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

A cricket (saddle) is a small peaked structure built behind a wide chimney to divert rainwater and debris around both sides of the chimney, preventing ponding and ice dam formation.

Roof Sailing Practice Test

Roof Sailing Practice Test

Roof Sailing Roof Flashing and Waterproofing 1