Aluminium H Joiner 58mm 2-Parts Polycarbonate Glazing Bar

Excelite's two-part Aluminium H Joiners provide a practical solution for connecting flat polycarbonate roofing sheets, twin wall polycarbonate sheets, and solid polycarbonate sheets. The two-piece H-Bar system makes installation easy and flexible, accommodating thermal expansion without penetrating the sheet.

Specifications

• Width: 58mm
• Lengths available: 3m or 6m (can be cut to length)
• Includes: 4 rubber gaskets per length
• Middle Gap: 9mm (leave 3mm expansion gap each side)
• Sheet thickness compatibility: 2mm to 16mm polycarbonate sheets
• Finish: Anodised aluminium

Aluminium glazing bars are suitable for both flat polycarbonate roofing sheets and twin wall polycarbonate sheets. Sheets simply rest on the H-Bar base ready for fixing, allowing thermal expansion without penetrations through the sheet.

Features & Benefits

• 100% waterproof — rubber gaskets create a secure weatherproof seal, no silicone needed
• Easy to install — lay sheets onto base, clip top cap over
• Roofing sheets expand freely — accommodates thermal movement
• Suitable for 2mm–16mm thickness polycarbonate sheets
• Can install on rafters or battens
• Anodised finish for long-term durability

How to Install Excelite Aluminium H Joiners

1. Slide the rubber gaskets into the aluminium H joiner. Each length requires four rubber strips: left, right, top, and bottom. Ensure the rubber lips face outward.
2. Fix the base section of the aluminium H joiner directly onto the roof purlins or rafters.
3. Position the polycarbonate sheets and leave an expansion gap of approximately 3mm on each side.
4. Clip the top cap onto the base section and secure with screws, ensuring sheets remain centred and expansion gaps are maintained.

Applications

• Joining solid polycarbonate sheets, twin wall polycarbonate sheets, multiwall polycarbonate sheets, acrylic sheets, and glass panels
• Roofing and vertical glazing: walls, facades, cladding, partitions, and enclosures
• Compatible with panel thicknesses 2mm–16mm
• Suitable for indoor and outdoor installations
• Patios, pergolas, verandas, carports, sunrooms, skylights, greenhouses, pool enclosures, and architectural glazing

Two-Piece vs Traditional One-Piece Aluminium H Bar

1. Sheet Thickness Compatibility

Traditional One-Piece: Designed for a specific sheet thickness only — different profiles required for different panel thicknesses.

Excelite Two-Piece: Suitable for 2mm to 16mm — one joiner system accommodates multiple panel types and thicknesses.

2. Ease of Installation

Traditional One-Piece: Panels must be slid into the channel along the full length — time-consuming on larger projects. Limited tolerance for panel size variations. Designed for twin wall only.

Excelite Two-Piece: Panels are simply laid onto the base section and the top cap is fixed over. Greater flexibility for slightly oversized or undersized panels. Ideal for both twin wall and solid flat polycarbonate.

3. Waterproof Performance

Traditional One-Piece: Achieving a watertight seal can be difficult — too tight and panels won’t slide; too loose and water penetrates.

Excelite Two-Piece: Rubber gaskets create a secure weatherproof seal. No silicone needed. Excellent long-term waterproof performance.

4. Price

Comparable in price to traditional one-piece H bars, but offers significantly easier installation, better sealing, and greater versatility for virtually the same cost.

Why Choose Excelite Two-Piece Aluminium H Joiners?

• ✔ Suitable for 2mm–16mm sheet thicknesses
• ✔ Faster and easier installation
• ✔ Excellent waterproof performance — no silicone required
• ✔ Greater tolerance for panel size variations
• ✔ Suitable for both roofing and vertical glazing: walls, screens, facades, and partitions

Can I Install Polycarbonate Roofing Without H Joiners?

Yes, for corrugated polycarbonate sheets you can overlap sheets directly and fix without H joiners. However, for solid, twin wall, and multiwall polycarbonate sheets, aluminium H joiners are highly recommended. They provide:

• A neat and professional finish
• Secure sheet fixing and support
• Better waterproofing and weather resistance
• Accommodation for thermal expansion and contraction
• Improved wind resistance and long-term durability

Without H joiners, it can be difficult to create a strong, watertight connection between adjacent sheets, increasing the risk of leaks, movement, or premature failure in outdoor applications such as pergolas, patios, verandas, and skylights.

Complete Your Installation

Pair your aluminium H joiners with these essential accessories for a professional, watertight result:

• Polycarbonate sealing / breather tape — seals sheet edges and keeps flutes clean
• Purlin / anti-noise tape — reduces expansion noise on battens
• End closures (U-profile) — seals sheet ends against dust and insects
• Polycarbonate H-joiners — budget-friendly plastic alternative for greenhouses
• Polycarbonate roofing screws with sealing washers — for watertight fixing

Browse our full polycarbonate roofing accessories range or contact our team for project advice. Same-day delivery available in Melbourne Metro; ships Australia-wide from our Dandenong South warehouse.