Roof Flashing
Ridge, Barge and Valley Flashing for Metal Roofs
Sealing a ridge, capping a barge, or lining a valley? Roof flashing is what keeps water out at every join and edge of the roof, and getting the right profile matters as much as the roof sheet itself. We stock the full range in Colorbond and Zincalume: ridge capping, barge capping, valley, tile, under, and roll-top flashings, in Monoclad and Speed Deck profiles at 0.55 BMT. Whether you are flashing a new metal roof or replacing a rusted valley on a re-roof, there is a profile matched to the sheet and the join.
Flashing for Every Join on the Roof
Each flashing does a specific job. Ridge capping seals the apex where two roof planes meet, barge capping finishes and weatherproofs the gable edge, and valley flashing carries water down the internal junction where two roof slopes meet, the join that takes the most water on the roof. Tile flashing seals where metal roofing meets a tiled section or wall, under flashing sits beneath the capping as a second line of defence, and roll-top ridge gives a rounded finish to the ridge line. Matching the flashing profile to your roof sheet, Monoclad or Speed Deck, keeps the cover consistent and the seal tight.
Colorbond or Zincalume
The choice comes down to finish and exposure. Colorbond flashing is colour-matched to finish cleanly against a Colorbond roof, so the ridge, barge, and valley blend into the sheet rather than standing out. Zincalume is the bare mill-finish option, common where the flashing is out of sight or where the roof sheet itself is Zincalume. Both run at 0.55 BMT for the strength and durability a roof edge needs, and both pair with the rest of the roof: see our roofing range for sheets and accessories, roof guttering to carry the water once it is off the roof, and flashings and dampcourse for wall and window junctions.
Every Flashing Profile in Stock, Delivered
- Every flashing type in stock: Ridge, barge, valley, tile, under, and roll-top, matched to Monoclad and Speed Deck roofs.
- Colorbond and Zincalume, 0.55 BMT: Colour-matched or mill finish, in the gauge a roof edge needs.
- Delivered across Sydney: Sydney, the Blue Mountains, Wollongong, and the Central Coast, or click and collect from Arndell Park.
- Australian-owned family business: Western Sydney based. Real people, real stock, real advice.
Whatever join the roof throws up, ridge to valley, we’ve got the flashing to seal it.
Call 1300 554 775 or request a quote online and our team will help match the profile and finish to your roof.
Frequently Asked Questions
What is roof flashing?
Roof flashing is the sheet metal that seals the joins and edges of a roof, like the ridge, barge, valley, and where the roof meets a wall. It directs water away from these vulnerable points to stop leaks.
What is the difference between ridge and barge flashing?
Ridge capping seals the apex where two roof planes meet at the top, while barge capping finishes and weatherproofs the sloping gable edge of the roof. They are different profiles for different joins.
What does valley flashing do?
Valley flashing lines the internal junction where two roof slopes meet and channels the combined water down and off the roof. Because it carries the most water, it is one of the most important flashings to get right.
Should I use Colorbond or Zincalume flashing?
Colorbond flashing is colour-matched to blend with a Colorbond roof, while Zincalume is a bare mill finish used where the flashing is hidden or the roof sheet is Zincalume. Match the flashing to your roof sheet and finish.
What is 0.55 BMT flashing?
BMT is the base metal thickness of the steel. At 0.55 BMT, the flashing has the strength and durability needed for roof edges and joins exposed to weather and foot traffic during install.