Question 27
Domain 5: Roof-Ceiling Construction and Attic AssembliesWhat type of flashing is required where a roof meets an exterior wall per the IRC?
Correct answer: B
Explanation
IRC roof-to-wall intersections require step flashing at the wall and kick-out flashing where the roof terminates at a wall. These flashings direct water away from the wall and into the gutter, preventing leakage at the joint.
Why each option is right or wrong
A. No flashing required if caulking is used
B. Step flashing and kick-out flashing
IRC Section R903.2 requires flashing at roof intersections with vertical surfaces, and IRC Section R903.2.1 specifically addresses roof-to-wall intersections by requiring corrosion-resistant step flashing at the wall. Where the roof edge terminates at a wall and water must be diverted into a gutter, the code also requires a kick-out diverter flashing to prevent runoff from entering the wall assembly; this is the standard code treatment for that condition under the IRC flashing provisions.
C. Only a single piece of sheet metal
D. Flashing is optional if the wall has a rain screen