What Is Step Flashing?
Step flashing is an essential component of asphalt shingle roofing systems, designed to prevent water infiltration at roof-to-wall intersections. Proper installation of step flashing ensures the longevity and performance of the roof by directing water away from vulnerable areas.
Standard vs. Alternative Step Flashing Sizes
Standard Step Flashing:
- Dimensions: Extends a minimum of 5” (127 mm) up the wall and 5” (127 mm) out onto the shingles.
- Length: Must be a minimum of 2” (51 mm) longer than the exposure of the shingles being installed.
Alternative Step Flashing:
- Dimensions: Extends a minimum of 4” (102 mm) up the wall and 4” (102 mm) out onto the shingles.
- Length: Must also be a minimum of 2” (51 mm) longer than the exposure of the shingles being installed.
Conditions for Using 4″ x 4″ Step Flashing
Using 4” x 4” step flashing is acceptable under specific conditions to ensure proper protection and performance:
- Installation of Leak Barrier:
- A full 36” (914 mm) width of leak barrier (such as StormGuard® or Weather Watch® Leak Barrier) must be installed at the wall to roof deck transition.
- The leak barrier must extend a minimum of 5” (127 mm) up the wall.
Importance of Leak Barrier
The leak barrier is crucial in this setup as it provides an additional layer of protection against water infiltration, compensating for the reduced dimensions of the 4” x 4” step flashing. This ensures that even with the alternative flashing size, the roofing system remains robust and watertight.
Conclusion
Proper step flashing is vital for preventing water damage and ensuring the longevity of asphalt shingle roofs. While the standard 5” x 5” step flashing is preferred, using 4” x 4” step flashing is a viable alternative when combined with a full-width leak barrier extending up the wall. By adhering to these guidelines, contractors can ensure the effectiveness and durability of their roofing installations.
For Immediate Service or Consultation
Contact Allied Emergency Services, INC.
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Email: Info@AlliedEmergencyServices.com
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If you require immediate assistance or have specific questions, our human support is readily available to help you.
Disclaimer: This article is intended for informational purposes only. For professional advice, consult experts in the field.
