Aztec Washer Company SQ501BA - Master Flash Square Flashing - (4 in. - 8 1/4 in.), #5

The Aztec Washer SQ501BA Standard Master Flash is a large-size roof flashing built from black EPDM. It is designed to provide reliable sealing for bigger pipe penetrations on residential and commercial roofs. The flexible, trim-to-fit sleeve accommodates vibration and thermal expansion, while the soft base conforms to most roof profiles and pitches. Clearly marked cut lines simplify on-site customization, ensuring a precise and watertight installation.

Key Features:

• Black EPDM compound engineered for UV, ozone, and weather resistance.
• Large trim-to-fit sleeve marked for accurate on-site cutting.
• Flexible design absorbs vibration and pipe movement.
• Soft, conforming base adapts to common roof panel profiles.

• Part number: SQ501BA
• Material: Black EPDM
• Pipe range: 4 in to 8-1/4 in (101–209 mm)
• Base size: 11 in (279 mm)
• Application: 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 SQ501BA?
A: Urethane or silicone sealant is recommended. Avoid petro-chemical-based sealants.

Q: Can SQ501BA be used for residential and commercial roofing?
A: Yes, it is designed to adapt to most roof profiles and slopes.

Q: Is SQ501BA appropriate for high-temperature applications?
A: EPDM is rated up to 212 °F (100 °C). For hotter applications, silicone flashings are recommended.

Q: How is SQ501BA installed?
A: Trim the sleeve to fit pipe size, slide over the pipe, form the base to the roof, apply sealant, and fasten.