These custom hardwood doors can accommodate almost any opening and are made in a wide variety of wood species. The Duratherm hardware makes operation simple and easy and our precision joinery and detailing create architectural doors with impact resistance, thermal integrity and beauty that exactly matches the architect’s vision.

Photo © Kent Dayton


Wood Species & Finishes

Duratherm sources all its materials by project, only from providers we know and trust. Many of our woods come 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 laquer, stain, bleach stain, oil, etc.) and to discuss the use of a species not on our standard menu. We consider availability, durability, machining, and gluing characteristics to determine the feasibility of your choices.




We offer dry or wet weeped

glazing compounds.

Specially developed extruded silicon gasket sets the glass by compression. Our proprietary system is long-lived, has low maintenance, and stays waterproof.

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




We use only the highest quality hardware. Our standard hardware finishes for most window operators are lacquered Red Bronze (US 20) and White Bronze (US 25). Other finishes are available on request.



KEY (mouse over #s to view details)



Standard Hardware (residential applications only)

Primary Door Lockset

Heavy duty mortise construction. Half-turn lever controls hook bolts, dead bolt, and latch. Hook bolt assembly fully mortised into rail to provide 3- or 4-point latching at frame and adjacent door/frame. Locking mechanism incorporates a standard US cylinder. Based on G-U Cremona or Tripact door bolt system.

Finishes: Yellow Dichromate or black powder coated steel. Cremona locksets are available in stainless steel.

Screen Door Lockset

Heavy duty mortise construction. Single doors have mortised lockset. Paired screen doors have mortised lockset on active leaf, dummy handle and top & bottom shoot bolts on inactive leaf. Based on G-U Monolock operating hardware.

Finishes: Yellow Dichromate or black powder coated steel. Faceplate available in stainless steel.

Escutcheons / Lever Handles

Escutcheons, roses, and lever handles are available in a variety of styles and configurations from various manufacturers. Finishes: A variety of finishes are available from various manufacturers.


Solid brass five-knuckle ball-bearing butt hinges, minimum 1 1/2 pair per leaf, in manufacturer’s standard finishes.

Primary Door: 4 1/2" x 4 1/2" Screen Door: 3 1/2" x 3 1/2"

Commercial Hardware

Most commercial hardware can be incorporated into our door panels, including flush bolts, exit devices (rim, mortise, surface vertical rod and concealed vertical rod), door closers, electric strikes, and others.

NOTE: Some hardware installations may require modifications to door leaf or frame detailing, such as concealed closers and meeting rail weather-strip at concealed vertical rod assemblies. Contact factory for assistance. Hardware must be suitable for our standard 2 1/4” leaf thickness.

Optional Hardware

Screen doors, astragals, ADA-compliant metal thresholds


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.

Clear glass opening: Unit height minus 15 1/2", unit width minus 12".


Continuous extruded silicone flap gasket set in rebate in door frame around perimeter of door panel. Engaging the multi-latchpoint espagnolettes (standard hardware) compresses the weather-strip to ensure a tight seal.


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


Minimum: 24”

Maximum: 48"


Minimum: 74”

Maximum: 120"

ADA Compliance

Clear-opening sizing based on 32" clear width requirement.

Minimum unit width: 35 1/2" (assuming 180° door swing)

NOTE: Standard wood threshold may not meet ADA maximum height requirements. Doors that are not able to open a full 180° may need to increase in width.

Consult factory with specific clearance questions

Frame Depths/Leaf Thickness

Standard primary door leaf thickness: 2 1/4"

Standard screen door leaf thickness: 1 3/8"

Standard frame depth *: 6 1/4"

Minimum frame depth *: 4 3/4"

Maximum frame depth: 10"

* Contact factory for frame depths less than 6¼".

NOTE: When screen doors are specified, handle clearances must be considered when determining appropriate frame depths.



Static Air Infiltration:
ASTM E283 cfm/ft2 @ 6.24 psf

Allowed 0.30 Test Result 0.02

Water Infiltration:
ASTM E547-cyclic ASTM E331-static at 8 psf

Allowed 0.0 Test Result 0.0

Load Deflection:
ASTM E330 10 sec at +60 and -60 psf


Sash Torsion:
AAMA/WDMA/CSA 101 / I.S.2 / A440


Vertical Deflection:
AAMA/WDMA/CSA 101 / I.S.2 / A440


Forced Entry:

Thermal TransmissionResults

Center of Glass:
ASTM C-236 U-value using Viracon VE1-2M Low E glass and Lawrence Berkeley Laboratories Winow 5.2 analysis program.
NFRC certified.

1": 0.29 with Argon: 0.24

Total Unit:

1": 0.34 with Argon: 0.30
Hurricane ImpactResults

Large Missile Impact and Cyclical Air Pressure:

- ASTM E1996-05, ASTM E1886-05

- Tested at 42 psf

- Wind Zone 3, not including Dade County, FL

- Missile Level D

Note: Contact factory for size limitations

and detail modification required for

hurricane certified units.


© 2021 Duratherm Company | 720 Main Street, Vassalboro, ME 04989 | T 207.872.5558 / 800.996.5558 | F 207.872.6731