A wall cladding crew starts above a low roof before the base flashing and counterflashing are installed. Water will shed from the wall onto that roof edge. What is the best correction?
Correct Answer
A) Stop and install the flashing sequence so water is shingled to the exterior drainage path
Flashing must be sequenced shingle-fashion so water drains outward rather than behind the roof edge. Other choices use non-durable sealant, rely on evaporation, or delay a concealed critical layer.
Why This Is the Correct Answer
Flashing must be sequenced shingle-fashion so water drains outward rather than behind the roof edge. Other choices use non-durable sealant, rely on evaporation, or delay a concealed critical layer.
Why the Other Options Are Wrong
Option B: Seal the bottom cladding edge with painter's caulk
Choice B (Seal the bottom cladding edge with painter's caulk) is rejected because it describes work from another assembly, while the Flashing sequencing item is asking for Stop and install the flashing sequence so water is shingled to the exterior drainage path.
Option C: The crew should leave a gap and rely on evaporation
In thermal and moisture protection, Leave a gap and rely on evaporation is the wrong selection for Flashing sequencing: the option does not produce the required Flashing sequencing outcome, Stop and install the flashing sequence so water is shingled to the exterior drainage path.
Option D: Install flashing after the first leak test only
The trap in D is Install flashing after the first leak test only. That selection is wrong because the option delays or omits the controlling step.
Memory Technique
Picture a dimension string on the jobsite; flashing sequencing is solved by the action that leads to Stop and install the flashing sequence so water is shingled to the exterior drainage path.
Reference Hint
Open Roofing Construction and Estimating, Atcheson, 1995/2022 reprint; use the index entry or section for "Roof-to-wall flashing sequencing" to confirm that Flashing must be sequenced shingle-fashion so water drains outward rather than behind the roof edge.
More NASCLA Questions
Bid instructions require bid security with each sealed bid. Which purpose should the estimator associate with that requirement?
A wood deck surface has 320 sf of coverage. Boards have a 5-1/2 in. actual face width, and the order includes an 8 percent cutting allowance. What linear footage is closest?
Using the dimensions shown for the stabilized construction entrance, what is the plan area?
A reroof area requires 14,720 sf of rigid insulation. Boards are 4 ft by 8 ft, and the order includes 5 percent waste. How many boards are needed?
Two addenda revise the drawings before bid day. What must a responsive bidder normally do with those addenda?
A utility trench is 180 ft long, 3 ft wide, and 7 ft deep with vertical sides inside a trench shield. What excavation volume is required?
A 120 ft long Type C trench is cut with a 4 ft bottom width and a 6 ft depth. If side slopes are 1-1/2 horizontal to 1 vertical, what excavation volume is closest?
A storm pipe run needs 240 ft of bedding, 4 ft wide and 6 in. thick. Including a 10 percent ordering allowance, how many cubic yards of bedding aggregate are needed?
A mass excavation produces 1,180 loose cubic yards of material for off-site disposal. End-dump trucks can haul 18 loose cubic yards per trip. What truck count is required?
An asphalt-shingle roof has a slope of 3:12. Under the IBC low-slope asphalt-shingle provisions, what underlayment arrangement is required?
People Also Study
Business & Financial Management
120 questions · 70% to pass
Contract Administration
60 questions · 70% to pass
Project Management
60 questions · 70% to pass