P501 Glazing Bar

An aluminium capped rafter gasket glazing bar into which multiwall polycarbonate, solid polycarbonate or glass can be fitted onto rafters at least 50mm in width.

The P501 can be supplied either as a pre-pack complete with aluminium cap, gaskets and end plate or as loose individual packs.

Standard Glazing Bar

Colour:White or Brown (Mill Finish on request)
Length:3m, 4m (and 6m as non-standard)

The P501 glazing bar is designed to be fitted onto 50mm wide rafters and consists of a 50mm wide rafter gasket (ref. 501), an aluminium cap (ref. 500), gaskets (ref226G) and a push fit end plate (ref. 500EP).

The rafter gasket is nailed to the rafter using galvanised nails at 300mm intervals, the glazing sheet sits on the rafter gasket and the cap is drilled at intervals no more than 350mm apart. 65mm stainless steel wood screws are then fitted through the cap into the rafter, a screw cover cap is needed to cover and protect the head of the screw.

The P501 glazing bar is supplied as a pre-pack in 3m and 4m lengths, 6m lengths supplied as loose items rather than as pre-packs may also be available.

Hip Glazing Bar

The P501 glazing bar is used on lean-to roofing applications, it can be used for slightly angled hips however we recommend the 226 hipped cap or the 321 hipped glazing bar onto a 60mm rafter for more angled hip applications.

Colour Options

Polyester powder coated white (RAL9910 satin) and brown (RAL8040 satin) are available as standard, Mill finish is available on request. We can also supply the aluminium cap painted to a specific RAL colour although this may be subject to a minimum quantity requirement and surcharge.

Mill FinishRAL 9910
White (satin)
RAL 8040
Brown (satin)
Please note: The colours shown are not 100% accurate and are for guidance only


  • Rafter Assembly Roofing
  • Conservatories
  • Canopies
  • Car Ports
  • Lean-to Conservatories
  • Porches

Glazing with Glass

The P501 glazing bar is suitable for use with glass up to 24mm thickness. Twinfix cannot advise as to the size of rafters required or at what centres they should be placed. We do recommend that a mechanically fixed end plate similar to our RG-MEP end plate be fitted at the foot of each bar.

Complementary Fixing Accessories

Side TrimU Profile
Ref 272 - 10mm
Ref 273 - 16mm
Ref 275 - 25mm
Side TrimRef 252 - 10mm
Ref 253 - 16mm
Ref 255 - 25mm
U Profile
Eaves FillerFixing Buttons (white)Fixing Buttons (brown)
Ref 226F226 Eaves FillerRef 272 - 10mm
Ref 273 - 16mm
Ref 275 - 25mm
Ref 252 - 10mm
Ref 253 - 16mm
Ref 255 - 25mm
Anti-dust/Breather TapeButyl Flashing
Ref FT or PBT 10
Ref FT or PBT 16
Ref FT or PBT 25
Anti-dust/Breather Tape200/20 White
200/20 Lead
Butyl Flashing

Help & Advice

If you have a project in mind or would like help or advice on any of our products or services, please either ring us on 01925 811311, email us at enquiries@twinfix.co.uk or get in touch via the enquiry form on our Contact Us page.


Related FAQs

1. Can I use your glazing bars to install glass?
You can use all of our bars to install glass, with the exception of the P600 and P700 Snap-fit systems. However, please note that you will need to use a Mechanical End Plate to ensure the glass is held securely in place; the plastic end plates that are supplied with the bars are only suitable for use with multiwall polycarbonate.