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Residential Bi-Fold Doors
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The Residential bi-fold doors have an in-frame bottom roller track that allows greater carrying capacity and facilitates the 'lay-back' option where two-panel configurations can swing back against an adjoining wall for clutter-free decks.

These are bottom-rolling and rated to 2.1m high in very high wind zones. For higher doors consider using the Metro Series or APL Architectural Series.

Key Features
  • For mainstream residential use
  • A flat-face frame, rails and stiles for a clean, contemporary look
  • Recommended maximum 2100mm high doors in Extra High wind zones. For larger sizes consider using the Metro Series and APL Architectural Series
  • The efficient bottom roller system allows optimum load capacity and increased panel width
  • For uncluttered decks a 'lay-back' option allows two panels to swing back against adjoining walls rather than project out at 90° (available in 2-panel, 2+1 and 2+2 configurations)
  • Corner bi-folds (90°) are available that do not require a corner post
  • Same profiles as hinged and French doors ensure continuity of style
  • Rebated sill track option allows flush floor levels inside and out (for sheltered locations only)
Bifold Doors
Scope of Use
  • Suitable for broad residential use
  • A good option for maximum unobstructed views and ventilation
  • Need to be used in defined maximum sizes according to the wind exposure
Limitations on Use
  • Recommended maximum 2100mm high doors in Extra High wind zones — For larger sizes consider using the Metro Series and APL Architectural Series
  • Careful consideration of bi-fold use is required when projecting on to decks or pedestrian areas (lay-back option available in this situation)
  • Consider the ease of reaching to the bi-fold handle if the window is placed beyond a bench Open bi-folds need to be monitored if windy conditions occur
  • Free-swinging single panels not recommended
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
  •  Extensively used in residential projects throughout New Zealand for more than 40 years with continuous design upgrades
  •  Widely used by homeowners, builders, Group home 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
  • 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
E2 External Moisture compliant
External Moisture
Data Sheet
Span Tables
Declare Label


Altherm Care, Maintenance & Warranty Brochure (with AGP)


Altherm on Masterspec
Full Specification
Specification Clause
Specifier Guide
WGANZ Guide to E2/AS1
Altherm Design Brochure


AGP Cleaning & Maintenance
AGP Condensation Guide
AGP Visual Quality of Glass
APL and Sustainability


Manufacturer Contact List
CAD/PDF Details
Full Set of Drawings


Altherm Residential Bi-Fold Door Open Out Vertical Sectional Details


Altherm Residential Bi-Fold Door Overlight Transom and Overlight Coupling Bar


Altherm Residential Bi-Fold Door Three Panel Open Out Door Showing Panel Glazing Options


Altherm Residential Bi-Fold Door Meeting Stiles


Altherm Residential Bi-fold Door Meeting Stiles


Altherm Residential Bi-Fold Door 90° Meeting Stiles


Installation Details
Altherm Residential Bifold Door Open Out on Board & Batten


Altherm Residential Bifold Door Open Out on Brick Veneer


Altherm Residential Bifold Door Open Out on Bevelback Weatherboard


Altherm Residential Bifold Door Open Out on Flat Sheet


Altherm Residential Bifold Door Open Out on No Cladding


Altherm Residential Bifold Door Open Out on Profile Metal


Altherm Residential Bifold Door Open Out on Rusticated Weatherboard


Altherm Residential Bifold Door Open Out on Stucco


Altherm Bifold Door 2 Panels
Altherm Bifold Door 2 Panels Layback Option
Altherm Bifold Door 2+1
Altherm Bifold Door 2+2
Altherm Bifold Door 3 Panels
Altherm Bifold Door 3+1
APL Residential Bifold Door Open Out 4 Panel

Revit LT 2020

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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