Oak frame face applied glazing or direct glazing

Face applied glazing or direct glazing has pretty much become the industry standard for glazing a green oak frame and this is the method we use.

Face applied glazing is basically glass units sandwiched to the outside of the frame by seasoned oak cover boards.


There are however many ways of achieving this and using the correct method will make the difference between an oak frame that’s stays dry for decades to come, looks and stays aesthetically pleasing, has units lasting 25 years plus which can be easily replaced if broken (Strummers are a common culprit) against a frame that leaks after a year, units failing prematurely, difficult to replace due to cheap fixings and badly thought out procedure and ugly lead work!

Green oak can cause lead to corrode as tannin (tannic acid) contained within the oak attacks the lead. If the lead is laid directly onto green oak a separating membrane should be used such as a Class A building paper or, in certain circumstances, a bitumen paint may be suitable, particularly under lead flashings. If green oak is fixed above leadwork, tannic acid can leech onto the lead, and while in this situation the tannic acid does not harm the lead, it can cause unsightly staining and discolouration.

The faced applied glazing method we use is a dry glazed one. This means no silicon or mastics with drainage built in to the system. Not only is this more environmentally friendly but is also extends the life for the glazed units.

General specification used:

  • 36mm seasoned European joinery grade oak cover boards with a planed finish left to grey naturally
  • Cover boards secured with M8 SPAX stainless steel washer head T star screws, counterbored and cross grain pelleted
  • Durable softwood packers
  • EPDM black rubber dry glazing gasket
  • 0.6 mm copper flashings
  • 4-16-4 toughened safety glass, low-E, warm edge spacers, argon filled IGU’s
  • European painted softwood joinery (Rationel Domus) Quality locally made joinery units also available.

Key Features of the system used:

  • The entire structural timber frame is clad to provide a continuos waterproof seal.
  • The glazed units are floating to allow for movement of the timber frame.
  • All weather seals are EPDM rubber to provide longevity and allow for movement. No silicon or other mastics are used, which can degrade or tear.
  • Drainage is built into the system extending the life of the units.
  • Rebates in structural timber frame for all joinery elements improving performance and the aesthetics of the installation.
  • All installations are undertaken by ourselves guaranteeing performance and aesthetics.