Term: backputty

The term "backputty" refers to the application of putty behind a glass pane before it is fixed into a window frame, typically in timber glazing. It is a traditional glazing technique used to create a bedding for the glass, ensuring a secure and weather-tight seal.

In more detail:

• Backputty is applied in the rebate (the groove in the window frame) before the glass is installed.
• The glass is then pressed into the putty, which helps cushion the glass and prevent water ingress.
• After the glass is bedded into the backputty, front putty (also called face putty or fronting putty) is applied on the outside to seal and finish the glazing.

Purpose of backputty:

• Provides a weatherproof seal.
• Helps secure the glass in place.
• Prevents rattling and movement of the glass.
• Protects the timber frame from moisture damage.

Common materials:

• Traditionally, linseed oil putty is used.
• In modern applications, synthetic glazing compounds or sealants may be used depending on the frame and glass type.

Common in:

• Heritage or traditional timber windows.
• Restoration work.
• Custom timber joinery.

In Australia, backputtying is still used in heritage conservation and traditional glazing practices, especially in older homes and buildings.