Box Gutter Expansion Joint 225mm x 1m

The box gutter expansion joint is a 1m length of 225mm wide grey EPDM rubber with encapsulated metal springs and 0.8mm aluminium edges. It fits into a continuous box gutter run so the gutter can expand and contract as the temperature changes, without buckling the gutter or pulling the joints apart. Long box gutter runs need this movement break, and the EPDM body stays flexible and watertight for years.

Key Features

• 225mm wide x 1m long, grey EPDM with encapsulated metal springs
• Allows thermal expansion and contraction in box gutter runs
• 0.8mm aluminium flanges for secure screw or rivet fixing
• Ozone and UV resistant, rated to 135C intermittently
• Cut to length on site and sealed with silicone
• Also available in 3m and 10m lengths for longer runs

Specifications

• Product: box gutter expansion joint
• Width: 225mm
• Length: 1m (also available in 3m and 10m)
• Material: grey EPDM rubber, 1.4mm thick
• Metal edges: 0.8mm aluminium flanges
• Temperature resistance: up to 135C intermittently
• Warranty: manufacturer-backed, typically 20-25 years

Installation

Cut the joint to the gutter width, centre it over the joint in the box gutter run and fix through the aluminium flanges with screws or rivets. Fill the flange edges with a suitable silicone so the joint is watertight. The EPDM body flexes as the gutter moves, which is what protects the gutter seam from the stress of thermal movement.

Applications

• Long continuous box gutter runs
• Thermal movement control on steel and zincalume gutters
• Internal gutters where the run length needs a movement break
• New builds and re-roofs with concealed guttering

What You Need To Complete The Job

Support the box gutter with box gutter brackets so the run holds its fall, and use a matching box gutter flashing for the gutter itself. Browse the Fast Flashing range for more.

Frequently Asked Questions

Why does a box gutter need an expansion joint?

Steel gutters expand and contract as the temperature changes. On a long run that movement builds up and can buckle the gutter or tear the joints. The expansion joint gives the run a flexible break where that movement is absorbed safely.

How is it fixed?

Cut it to the gutter width, centre it over the joint and fix through the aluminium flanges with screws or rivets. Fill the edges with silicone so the seal is watertight.

Is the EPDM body durable?

Yes. The EPDM is ozone and UV resistant and rated to 135C intermittently, so it keeps its flexibility through years of weather and temperature change. The manufacturer backs it for roughly 20 to 25 years.

Can I order for delivery or pickup?

Yes. You can order online and choose Australia-wide delivery or pickup from our Truganina trade counter in Melbourne’s west. Delivery windows depend on your postcode, and we send a confirmation once your order is ready. For any questions call (03) 93941400 or email orders@singhroofingsupplies.com.au.