MasterFlash No. 9 Square‑Base 241–520 mm – Black

Overview

The MasterFlash® No. 9 Square‑Base is an elite pipe flashing solution designed to provide a robust, weather‑tight seal where pipes penetrate roofing, especially corrugated or metal profiles. Featuring a 635 mm x 635 mm pliable aluminium base and durable EPDM rubber sleeve, this model accommodates pipe diameters from 241 mm to 520 mm, offering an ideal fit for standard industrial and commercial applications 

Key Features

Available Variations

• Colours: Black (standard), grey, and high‑temp red silicone. Special-order options include BHP roofing colours 
• Materials: EPDM rubber (standard resistance) or silicone (ideal for high-temperature use). 
• Size variants: 
  • Standard No. 9: 241–520 mm pipe range (this listing) 
  • No. 9X: 158–520 mm pipe range with smaller opening 
  • Maxi & Maxi‑XL: to suit up to 724 mm or 1 000 mm diameter pipes 

Why Choose MasterFlash No. 9?

• Effortless installation: Slide the pre‑cut sleeve over the pipe, shape the base to the roof profile by hand, apply sealant, and fix with standard roofing fasteners—no specialised tools required 
• Built for movement: EPDM elasticity absorbs expansion and contraction of the pipe, maintaining a reliable compression seal 
• Weatherproof integrity: Ozone and UV resistance, combined with aluminium adaptability, ensures a long‑lasting, leak‑proof roof penetration—ideal for commercial and industrial settings 

Technical Snapshot

• Sleeve colour/material: Black EPDM (or grey/red silicone). 
• Base: 635 × 635 mm aluminium; soft, easy to shape; rib patterns improve waterproofing. 
• Cut‑to‑fit opening: 203 mm, trimmed 20–30 % smaller than pipe for tight seal 
• Warranty: 20 years standard; optional 35 years for EPDM variant with certification 

Recommended Accessories

• Roof‑and‑gutter silicone sealant – ensures watertight base-to-roof contact 
• Self‑drilling screws or sealed pop rivets – suitable for sheet metal installation 

What is the highest temperature a Master Flash® pipe flashing will handle?
– All EPDM MasterFlash flashings 135°C intermittently.
– A silicone red flashing has a high resistance of 260°C intermittently.
What type of sealant should be used on the Master Flash® flashings?
– A good quality roof & gutter silicone sealant should always be used when installing a Master Flash pipe flashing for metal roofs.
What type of screws should be used to fasten the flashings?
– The use of a self-drilling screw or pop rivet (sealed) is always recommended.
What is the life expectancy of the Master Flash® flashings?
– All Master Flash products carry a 25-year warranty.
What is the maximum roof pitch that the flashings can be used for?
– Most of our products are designed to cater to a roof pitch of 45°. If more is required, then our Master Flash Extreme Angle range is designed with a built in 40° pitch and therefore can handle a roof pitch from 35° – 65°.
Is there a product that can flash a Square Pipe?
– Yes, our Master Flash Square Vent Range is available and will suit penetrations from 20mm – 125mm. Now also available in a lead base option.