During window installation in a concrete block wall, what is the most critical step to prevent water infiltration?
Correct Answer
C) Properly flashing the sill and head
Proper flashing installation, especially at the sill and head, is critical for preventing water infiltration. Flashing directs water away from the window opening and is the primary defense against water penetration.
Why This Is the Correct Answer
Proper flashing installation at the sill and head is the most critical step because it creates the primary water barrier system that directs water away from the window opening. Flashing acts as the first line of defense against water infiltration by channeling water to the exterior before it can penetrate the wall assembly. Without proper flashing, even perfectly installed windows will eventually fail due to water penetration, making this the most fundamental requirement for long-term water resistance.
Why the Other Options Are Wrong
Option A: Using expanding foam around the frame
While installing the window level and plumb is important for proper operation and appearance, it does not directly address water infiltration prevention. A window can be perfectly level and plumb but still allow water penetration without proper flashing.
Option B: Caulking the interior perimeter
Expanding foam is primarily used for air sealing and thermal insulation around the frame, not as a primary water barrier. Foam can actually trap water if infiltration occurs and should never be relied upon as the main defense against water penetration.
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