Repair Systems — 04 — Roofing Defects
Ridge and barge capping systems — metal sheet roof
Ridge cappings seal the apex of a pitched metal roof; barge cappings finish the raking edge at gable ends. Both are roll-formed from Colorbond or Zincalume steel and must match the existing sheet profile, pitch angle and Colorbond colour. End laps must be sealed with butyl tape — unsealed laps are a primary leak path at ridgelines.
Ridge and barge cappings — what they are
Ridge cappings bridge the apex of a pitched metal sheet roof, covering the junction between two opposing sheet runs and providing weatherproofing at the ridgeline. Barge cappings finish the exposed raking edge of the roof at gable ends, covering the edge of the sheets and the bargeboard or fascia below. Both are roll-formed from Colorbond or Zincalume steel and are fixed with roofing screws through the capping into the top corrugation or rib of the sheets below.
Technical Reference
Profile selection, lap sealing, fixing requirements and colour matching for ridge and barge cappings
Product Reference
3 brands — Lysaght, Stramit and Stratco — Colorbond ridge and barge cappings
Lysaght Ridge and Barge Cappings
Colorbond and Zincalume ridge and barge cappings; profiles matched to Lysaght sheet products; full Colorbond colour range; custom-formed on request
Product type
Steel cappings — Colorbond or Zincalume substrate — AS 1562.1
System description
Lysaght supplies a range of ridge and barge cappings in Colorbond and Zincalume steel to complement their roofing sheet products. Ridge cappings bridge the apex of the roof between two opposing sheet runs; barge cappings finish the exposed raking edge of the roof at gable ends. Cappings are roll-formed to standard profiles and can be custom-fabricated for non-standard pitches or angles. Lysaght cappings are available in the full Colorbond colour range to match existing or replacement sheet. Fix through pre-punched holes or through the face of the capping with Class 3 or 4 roofing screws and EPDM-backed washers.
Technical properties
- Substrate: BlueScope Colorbond steel or Zincalume — full Colorbond colour range
- Standard ridge capping profiles: standard roll-top, pointed, adjustable apex — confirm from Lysaght range
- Barge capping: available in widths to suit standard sheet profiles
- BMT: typically 0.42mm for cappings
- Laps: minimum 150mm end laps for ridge cappings; lap joints must be sealed with butyl tape or compatible sealant
- Fixing: Class 3 or 4 hex-head roofing screws with EPDM sealing washer at each end of capping and at laps
- Custom profiles available for non-standard pitches — confirm with Lysaght branch
Limitations
- Capping colour must match the existing or replacement sheet Colorbond colour — confirm with strata committee if variation is proposed
- Capping profile must suit the existing roof pitch — verify pitch before ordering standard profiles
- Laps must be sealed — unsealed laps are a common leak path at ridge and barge
- Not suitable for Klip-Lok concealed-fix ridge termination — specific Lysaght Klip-Lok ridge details apply
Procurement
Lysaght branches nationally. Standard profiles typically in stock; custom profiles to order. Available through authorised Lysaght distributors and roofing merchants.
Confirm suitability with the current manufacturer TDS before specifying or applying.
Stramit Ridge and Barge Cappings
Colorbond and Zincalume ridge and barge cappings; dimensionally compatible with Stramit sheet profiles; full Colorbond colour range
Product type
Steel cappings — Colorbond or Zincalume substrate — AS 1562.1
System description
Stramit supplies ridge and barge cappings in Colorbond and Zincalume substrates to complement their roofing sheet products. Profiles are dimensionally compatible with Stramit corrugated and trapezoidal sheet profiles and available in the full Colorbond colour range. Stramit cappings are suitable for replacement of existing Stramit or Lysaght capped roofs where the profile is compatible. Confirm profile compatibility with Stramit before ordering for replacement of existing cappings from another manufacturer.
Technical properties
- Substrate: BlueScope Colorbond steel or Zincalume
- Full Colorbond colour range available
- Ridge and barge profiles — confirm available standard profiles from current Stramit range
- Minimum lap 150mm at end joints; seal laps with butyl tape
- Fix with Class 3 or 4 roofing screws and EPDM sealing washers
Limitations
- Confirm current profile range with Stramit TDS — not all profiles are stocked at all branches
- Profile must be confirmed compatible with existing sheet profile before ordering
- Same colour-matching and lap-sealing requirements as Lysaght cappings
Procurement
Stramit branches nationally. Confirm profile and colour availability at local branch before ordering.
Confirm suitability with the current manufacturer TDS before specifying or applying.
Stratco Ridge and Barge Cappings
Colorbond ridge and barge cappings; full Colorbond colour range; available through Stratco branches nationally
Product type
Steel cappings — Colorbond substrate
System description
Stratco supplies Colorbond ridge and barge cappings as part of their roofing accessory range. Available through Stratco branches nationally, these cappings are an alternative supply option for replacement of existing cappings on Colorbond corrugated or trapezoidal roofs. Confirm the specific profile, BMT and colour availability from the current Stratco range before specifying as a replacement for existing cappings — profile dimensions should be checked against the existing capping before ordering.
Technical properties
- Substrate: BlueScope Colorbond steel — full Colorbond colour range
- Ridge and barge profiles — confirm available profiles from Stratco branch
- Minimum lap 150mm at end joints; seal laps with compatible sealant
Limitations
- Confirm current profile range from Stratco before ordering
- Profile compatibility with existing sheet must be verified
- Less widely distributed in some states — confirm local Stratco branch stock before specifying
Procurement
Stratco branches nationally. Direct supply to trade through Stratco branches.
Confirm suitability with the current manufacturer TDS before specifying or applying.
Brand Equivalence
All three brands use BlueScope Colorbond steel — selection is driven by supply channel, local branch availability and profile match to existing capping.
| Product A | Product B | Equivalence note |
|---|---|---|
| Lysaght ridge/barge cappings | Stramit ridge/barge cappings | Equivalent products in the same Colorbond substrate. Profile dimensions may differ slightly between manufacturers — confirm profile compatibility with existing sheet before substituting. |
| Lysaght ridge/barge cappings | Stratco ridge/barge cappings | All three brands use BlueScope Colorbond steel and the full Colorbond colour range. Selection is driven by supply channel and local availability. |
System Comparison
Lysaght vs Stramit vs Stratco ridge and barge cappings. Confirm all profile details from current manufacturer TDS before ordering.
| Attribute | Lysaght | Stramit | Stratco |
|---|---|---|---|
| Substrate | BlueScope Colorbond | BlueScope Colorbond | BlueScope Colorbond |
| Colour range | Full Colorbond range | Full Colorbond range | Full Colorbond range |
| Ridge profiles | Standard, pointed, adjustable | Standard, confirm TDS | Confirm TDS |
| Barge profiles | Available — confirm widths | Available — confirm TDS | Available — confirm TDS |
| Min end lap | 150mm | 150mm | 150mm (confirm) |
| Lap sealant | Butyl tape or compatible | Butyl tape or compatible | Butyl tape or compatible |
| Custom profiles | Available — to order | Confirm with branch | Confirm with branch |
Common capping defects to assess before replacement:
- Unsealed end laps — water tracks under the lap at the ridgeline. Always seal laps with butyl tape when installing new cappings.
- Profile mismatch at capping base — the capping wing must sit flush on the top corrugation or rib of the sheet. A gap at this junction is a leak path.
- Missing or failed screws at laps — screws at capping laps are critical; missing screws allow the upper capping to lift under wind load and admit water.
- Capping installed at wrong pitch angle — a standard capping on a non-standard pitch will result in one side of the capping being raised and unseated against the sheet below. Always check pitch before ordering.
Disclaimer
This page provides general technical information only. Final product selection must be confirmed against the current manufacturer TDS, project specification, roof pitch, and applicable strata or heritage requirements. Do not rely on this reference as a substitute for professional roofing consultant advice.