Jamb Liners

Window and door liners (reveals) are available in a variety of material types. Aluminium and timber are the most popular choices. Liners serve multiple purposes by:

  • Acting as the fixing point into the frame of the house for securing the window on
    some products.
  • Providing the connection between the window and internal walls.
  • In some instances covering the framed wall construction.

The residential WeatherTight™ and AllSeasons™ suites need to be fitted with liners on the head, jamb, and sill unless alternative fixing and finishing decisions are made in the design process, which for example is common on rebated door sill details. NALCO designs also have the capability to provide for returning interior linings into the joinery via the use of our wallboard liner adapter.

SovereignSeries™ frames allow for concealed fixing within the frame reveal and consequently do not require additional jamb liners, although they are an optional choice.

Four types of liners are available. In some specific applications these are used in combination:

  • Standard timber (to suit wall cavity cladding thickness).
  • Aluminium (to suit wall cavity cladding thickness).
  • Liner infill (commonly used in rebated door sills).
  • Wall board liner (used around window and door jambs and heads).

Illustrations are shown in the WeatherTight™ awning window section.

Standard Timber Liners

Timber liners are commonly manufactured from finger jointed pine for a paint finish. Common sizes are 19mm, 25mm, or 30mm clear grade Pinus Radiata to NZS 3616, preprimed. Either grooved liners or liners to suit architraving are available

Rimu and Pinus Radiata are available where a natural stained or varnished finish is required. Treated timber is strongly recommended.

Timber reveals must meet the 15-year durability requirements of NZS 3602 or meet the 15-year durability criteria in the Ensis report “Timbers Used for Window Frames and Aluminium Window Reveals – A Review”.

Standard Aluminium Liners

Standard aluminium jamb liners are available in 96mm, 125mm & 137.5mm to suit a variety of wall thicknesses.

Standard aluminium liners are available to suit a variety of wall thicknesses. Designers should consider aluminium liners where a pre-finished, low maintenance liner is preferred or where the inside of a window comes into contact with water, such as  windows in bathrooms.


Liner Infill

An alternative to liners is the use of a liner infill. The liner infill is connected to the window or door and provides for fixing to the sill frame or structure. These are typically used in rebated door sill installations into concrete or timber floors or in situations where a timber liner on the sill isn’t regarded as desirable.


Wall Board Liner

The wall board liner used in conjunction with a plastic thermal break enables the wall board to return towards the window and finish cleanly against the liner. In this situation, it is recommended to use moisture resistant wall board material rather than a standard gypsum wall board.