Aztec Washer Company SQ401BA - Master Flash Square Flashing - (2 3/4 in. - 7 in.), #4

The Aztec Washer SQ401BA Standard Master Flash is a medium-to-large size pipe flashing designed for roof penetrations. Made from black EPDM, it provides excellent resistance to UV, ozone, and weathering for long-term performance. The flexible sleeve, clearly marked for trimming, ensures quick on-site sizing and accommodates pipe vibration and movement. Its soft base conforms to most roof panel profiles and slopes for a watertight seal.

Key Features:

• Black EPDM material engineered for durability and weather resistance.
• Trim-to-fit sleeve with markings for accurate pipe sizing.
• Flexible design absorbs vibration and pipe expansion/contraction.
• Conforming base adapts to a wide range of roof panels and slopes.

• Part number: SQ401BA
• Material: Black EPDM
• Pipe range: 2-3/4 in to 7 in (70–177 mm)
• Base size: 10 in (254 mm)
• Application: Medium-to-large pipe penetrations on residential and commercial roofs
• Temperature resistance: EPDM up to 212 °F (100 °C) continuous, 275 °F (135 °C) intermittent
• Warranty: 35 years (ICC-listed standard Master Flash)

Q: What sealant should be used with SQ401BA?
A: Urethane or silicone sealant is recommended. Avoid petro-chemical-based sealants.

Q: Can SQ401BA be used for both residential and commercial roofs?
A: Yes, it conforms to most roof panel configurations and roof pitches.

Q: Is SQ401BA suitable for high-temperature applications?
A: EPDM is rated up to 212 °F (100 °C). For hotter conditions, silicone flashings should be used.

Q: How is SQ401BA installed?
A: Trim the sleeve to the pipe size, slide over the pipe, form the base to the roof surface, apply sealant, and fasten securely.