A window installation requires flashing and a weather-resistant barrier. In what sequence should these components be installed?
Correct Answer
B) Barrier first, then flashing, then window
The proper sequence is weather-resistant barrier first, then flashing installation, then window placement. This creates a proper water management system that directs moisture away from the building envelope.
Why This Is the Correct Answer
The correct sequence (barrier first, then flashing, then window) follows the fundamental principle of water management in construction - creating overlapping layers that shed water away from the structure. The weather-resistant barrier provides the primary moisture protection, the flashing creates directed water channels, and the window is installed last to integrate properly with these protective systems. This sequence ensures that any water infiltration is captured and directed outward rather than into the building envelope.
Why the Other Options Are Wrong
Option C: Window first, then flashing, then barrier
Installing the window first prevents proper integration of the flashing and barrier systems, creating potential water infiltration points and compromising the building envelope's moisture protection.
Option D: Flashing first, then barrier, then window
Installing flashing before the weather-resistant barrier violates the proper layering sequence and prevents the barrier from providing continuous moisture protection behind the flashing system.
Memory Technique
Use the acronym 'BFW' - Barrier, Flashing, Window - and remember 'Before Fixing Windows' to recall the proper installation sequence.
Reference Hint
Florida Building Code Chapter 14 (Exterior Walls) and Chapter 30 (Elevators and Conveying Systems) - specifically sections on weather-resistant barriers and flashing requirements
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