This Bostik Z-Bond Plumbers Roof & Gutter Silicone comes in a clear 300 g tube, ready for standard caulking guns so you can sort roof and gutter gaps without stuffing around. The bead handles around 25% joint movement, so metal sheets that shift a few millimetres under 40°C sun stay sealed. The gear sticks to sheet metal, zincalume and aluminium, so one tube works across most rooftop setups.

The silicone cures as a clear flexible joint over widths from about 4 mm to 8 mm, which covers typical laps on domestic gutter runs. A single 300 g tube will usually cover around 12 m of joint at a 5 mm bead, so you can tackle a full side of a small shed in one go. That makes it a smart buy for Aussie jobs where hot days, sudden rain and metal roofs are the norm.

• Bostik Z-Bond Plumbers Roof & Gutter Silicone
• Clear silicone sealant in 300 g tube
• Suitable for sheet metal roof joints
• Bonds to aluminium and zincalume surfaces
• Suits cladding and potable water tank joints
• Accommodates approximately 25% joint movement
• Ideal for sealing gutters and roof laps
• Compatible with standard caulking gun applicators
• Flexible joint helps handle temperature expansion
• Clear finish keeps metalwork appearance tidy

Q: Can I use this silicone on zincalume gutters?

Yes, it is suitable for zincalume. This gear is specified for sheet metal and zincalume surfaces, which includes typical Australian gutters and roofing. Clean the metal first and make sure it is dry before applying the bead. A standard caulking gun is all you need for application.

Q: Is the sealant clear once it has cured?

Yes, the silicone cures clear. The tube is clearly marked as a clear variant, so it will not add a solid colour strip to your gutters or roof sheets. This helps the bead blend in on aluminium and zincalume finishes. It is handy where the joint is visible from the ground.

Q: How much joint can I seal with one 300 g tube?

You can usually cover several metres. Actual coverage depends on the bead width and depth you run along the joint. For a typical narrow roof or gutter lap you can expect enough material for multiple metres of sealing. Running a consistent bead will help avoid wastage.

Q: What kind of movement can this silicone handle in the joint?

It accommodates about 25% movement of the original joint width. That means a 8 mm wide joint can move roughly 2 mm either way without cracking the seal. This capacity suits metal roofs that expand and contract in hot and cold weather. Staying within this movement range keeps the seal working as intended.