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Smartwood Bi-Fold Windows
New APL 2019 Specifier Guide now available Order now

Smartwood bi-folds have the same frame as the bi-folding door but with a narrower rail. The rolling gear sits outside the sash and allows easy cleaning at the sill.

Configurations are generally supplied in even panel numbers. Overlights are possible.

Key Features
  • The Smartwood bi-fold window system is bottom rolling for optimum panel support
  • It uses the bi-fold door frame and track but the panels have smaller rails and stiles
  • A minimum panel width of 650mm applies
  • Smartwood bi-fold windows are generally supplied in multiples of two i.e. 2-panel, 4-panel, 6-panel (free-swinging third panels are not recommended in bi-fold window applications)
  • A PVC thermal insulator between the aluminium and timber cladding prevents condensation transfer and enhances thermal performance
Categories / Ranges
Bifold Windows Altherm Smartwood
Scope of Use
  • Suitable for most residential environments
  • Need to be used in defined maximum sizes according to the wind exposure
Limitations on Use
  • Careful consideration of bi-fold use is required when projecting on to decks or pedestrian areas
  • Consider the ease of reaching the bi-fold handle if the window is placed beyond a bench
  • A good option for maximum views and ventilation but need to be monitored if windy conditions occur
  • Free-swinging single panels not recommended
  • A minimum panel width of 650mm applies
Statement of Building Code Compliance
  • Designed, tested and manufactured to meet NZS 4211: Performance of Windows, and NZS 4233:  Glazing in Buildings, Parts 1-4
  • Designed and tested to conform to NZ Building Code, including Clause E2
In-Service History
  • Launched in 1997
  • Some design upgrades implemented
  • Widely used by homeowners, builders and specifiers
Other Performance Attributes
  • Window and door warranty provided under normal conditions of use against failure of materials and workmanship for a period of five years
  • Smartwood products need sealing after installation with an appropriate finish e.g. oiled, varnished, stained or painted; regular care and restoration recommended
  • Aluminium surface finish is covered by a separate performance warranty dependent on the actual finish selected
  • A hardware/componentry warranty is offered against defects in manufacturing, functionality and surface finish for a period of five years, provided care and maintenance guidelines have been followed
Data Sheet
Span Tables
Altherm Care & Maintenance Brochure


Producer Statement / Warranty


Full Specification
Specification Clause
Specifier Guide
WGANZ Guide to E2/AS1
APL and Sustainability


Manufacturer Contact List
CAD/PDF Details
Full Set of Drawings
Altherm Smartwood Bi-Fold Window


Altherm Smartwood Bi-Fold Window


Stylish contemporary lines, effective thermal technology and unwavering attention to detail have made Altherm a favourite with architects, designers and homeowners across New Zealand.

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