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Bifold Exterior Doors

Bifold Exterior Doors

For clear, unobstructed openings, choose expansive bifold exterior doors. With panels folding to the exterior and stacking at the sides, these door systems intentionally provide the spaciousness you and your clients' desire. With an optional flush sill detailing helps create a seamless transition from the interior to the exterior, they are popular for restaurant facades, pool enclosures and porches.

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Bifold Doors Data Sheet

Door
Operating System G-U 925 sliding/folding hardware. Doors are top hung, with in-line rollers mounted at head of each moving panel. Heavy duty mortise construction. Multi-latchpoint locking gears. Shoot bolt assembly fully mortised into rail to provide 2-point latching at top and bottom for folding panels; hook bolt assembly fully mortised into rail to provide 3-point latching at top, bottom, and jamb for hinged panel. Finishes: Internal operating mechanisms in zinc chromate coated steel and aluminum alloys. Edge stile cover in clear anodized (EV-1) or dark bronze anodized (EV-5) aluminum. External guides and tracks are clear anodized (EV-1) or dark bronze anodized (EV-5) aluminum. Escutcheons / Lever Handles Escutcheons and lever handles are aluminum. Finishes: Clear anodized (EV-1) or dark bronze anodized (EV-5) aluminum. Hinges Zinc chromate steel hinges with snap-on brown plastic covers. Optional Hardware Active panel independent of the folding panels can be fabricated as a tilt/turn panel. Sill detailing can be provided without threshold.

Door

Operating System
G-U 925 sliding/folding hardware. Doors are top hung, with in-line rollers mounted at head of each moving panel. Heavy duty mortise construction. Multi-latchpoint locking gears. Shoot bolt assembly fully mortised into rail to provide 2-point latching at top and bottom for folding panels; hook bolt assembly fully mortised into rail to provide 3-point latching at top, bottom, and jamb for hinged panel.

Finishes:

Internal operating mechanisms in zinc chromate coated steel and aluminum alloys.
Edge stile cover in clear anodized (EV-1) or dark bronze anodized (EV-5) aluminum.
External guides and tracks are clear anodized (EV-1) or dark bronze anodized (EV-5) aluminum.

Escutcheons / Lever Handles
Escutcheons and lever handles are aluminum.

Finishes: Clear anodized (EV-1) or dark bronze anodized (EV-5) aluminum.

Hinges
Zinc chromate steel hinges with snap-on brown plastic covers.

Optional Hardware
Active panel independent of the folding panels can be fabricated as a tilt/turn panel. Sill detailing can be provided without threshold.

Standard Configurations
First digit = total panels. Second and third digit = folding panel groupings. 220, 321, 330, 431, 440, 541, 532, 550, 633, 651, 660, 743, 761, 770

Glazing
All glazing is per project specifications. Duratherm can accommodate most configurations and make-ups from 1/8" single glazed to a maximum of 1" security glass. Contact the factory for customized glazing and glass stop configurations. Clear glass opening: Unit height minus 163/8". For clear glass width, contact factory.

Weather-Stripping
Door Panel Continuous extruded silicone flap gasket set in rebate in doorframe at head and jambs with doubled extruded flap silicone gasket set in rebates at bottom rail of door panels. Engaging the multi-latchpoint lever espagnolettes compresses the weather-strip to ensure a tight seal.

Sizing
The minimums and maximums shown are intended as guidelines. For applications that exceed these ranges, please contact the factory for assistance. Width Minimum Panel: 16” Maximum Panel: 36" Height Minimum Panel: 16” Maximum Panel: 36" ADA Compliance Clear-opening sizing based on 32" clear width requirement. Minimum unit width: 35 1/2" NOTE: Standard wood threshold may not meet ADA maximum height requirements. Consult factory with specific clearance questions Frame Depths/Leaf Thickness Leaf thickness: 2 11/16" Standard frame depth: 6 1/4" Minimum frame depth: 4 3/4" Maximum frame depth: 10" *Contact factory for frame depths less than 6 1/4".

Sizing

The minimums and maximums shown are intended as guidelines. For applications that exceed these ranges, please contact the factory for assistance.

Width
Minimum Panel: 16”
Maximum Panel: 36"

Height
Minimum Panel: 16”
Maximum Panel: 36"

ADA Compliance
Clear-opening sizing based on 32" clear width requirement.
Minimum unit width: 35 1/2"

NOTE: Standard wood threshold may not meet ADA maximum height requirements.
Consult factory with specific clearance questions

Frame Depths/Leaf Thickness
Leaf thickness: 2 11/16"
Standard frame depth*: 6 1/4"
Minimum frame depth*: 4 3/4"
Maximum frame depth: 10"

*Contact factory for frame depths less than 6 1/4".

Wood Species & Finishes

Duratherm sources all materials by project — from only providers we know and trust. Many of our woods are from Forest Stewardship Council® (FSC- C108949) certified sources. We obtain others from sustainably harvested plantations. Fourteen domestic and exotic wood species offer a wide range of colors, grains, and textures.

Please contact us for information about finishing options (including paint, Sikkens, clear lacquer, stain, bleach stain, oil, etc.) and to discuss the use of a species not in our standard offering. We consider availability, durability, machining, and gluing characteristics to determine the feasibility of your choices.

Exterior Wood Species

African Mahogany
Exterior
Cypress
Exterior
Honduran Mahogany
Exterior
Jarrah
Exterior
Redwood
Exterior
Sapele Mahogany
Exterior
Spanish Cedar
Exterior
Teak
Exterior

Interior Wood Species

African Mahogany
Interior
Ash
Interior
Cherry
Interior
Cypress
Interior
Douglas Fir
Interior
Honduran Mahogany
Interior
Maple
Interior
Red Oak
interior
Sapele Mahogany
Interior
Spanish Cedar
Interior
Teak
interior

Bifold Detail

1HEAD SLIDING PANEL

2HEAD SWING PANEL

3HINGED JAMB

4OPERABLE JAMB

5SILL SLIDING PANEL

6SILL SWING PANEL

7INTERIOR HINGE

8EXTERIOR HINGE

Glazing

Dry Glazing

Specially developed extruded silicone gasket sets the glass by compression. Our proprietary system is long-lived, low maintenance and water resistant.

Wet Glazing

Our special silicone wet glazing compound bonds to the glass for long-lived sealing. Plus, our continuous extruded silicone weatherstrip runs around the frame perimeter and the seal is not compromised by seasonal expansion and contractions of the sash and frame.