ThermaTru Doors

Education Center

Therma-Tru Door Systems

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A narrow panel installed next to a door for decorative and natural light purposes.

Sidelites come in 10", 12" and 14" widths and are available in 6'6", 6'8", 7'0" and 8'0" heights. Sidelite size and shape availability will vary by glass family and door collection.

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Numerous glass colors, textures, shapes, and caming options are available to complement any door and match any taste.

Triple-Pane Glass
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Two panes of tempered glass

Decorative or privacy
glass panel

Lite frame

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Formed metal
stripping used between cut
pieces of glass to assemble
the pieces into a decorative

Glass that
features ground and
polished edges to
create a prism-like

Field Glass:
Pieces of smooth or textured glass cut to create a design.

Download the Therma-Tru decorative and
specialty glass brochure to learn more (pdf)
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Available in grained color and smooth surfaces along with a variety of stain and paint color options to complement a home. The craftsmanship and innovation inside a door slab helps deliver an attractive appearance and long-lasting security, durability and energy efficiency.

The beauty of wood and the strength of steel, without the compromises of either.

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The Beauty of Fiberglass:
  • Authentic wood grains and high-definition panel embossments.
  • Fiberglass skins provide durability and long-term performance.
  • Smooth, ready-to-paint surfaces for unlimited color options.
  • Polyurethane foam core provides up to four times the insulating value of wood.*
  • Therma-Tru fiberglass door systems carry a Lifetime Limited warranty.**
Learn more about the construction of a
Classic-Craft® premium entryway (pdf)
Learn more about the construction of a
Fiber-Classic® and Smooth-Star® entry door (pdf)

*Comparison of fiberglass to wood doors (both without glass).

**See your Therma-Tru seller or visit
for details on warranties.

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The bottom horizontal component of the door system that sits on the floor, also called the threshold.

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Many applications, multiple sills.

Therma-Tru offers a variety of sill choices and options. Some things to consider when choosing a sill:

  • Is the door in-swing or out-swing?
  • What door and sidelite configuration is being used?
  • What are the specific finish options and cap colors that are being requested?
  • What are the local codes and regulations?

Inswing options
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Outswing options
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Learn more about Therma-Tru sill
options and applications (pdf)
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Mechanisms that allow the door to swing open or closed. Hinges also help ensure stability and performance.

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    Adjustable Hinge
  2. [Detail Image]
    Classic-Craft Ball-Bearing Hinge
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    Self-Aligning Ball-Bearing Hinge
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    Self-Aligning Hinge
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    Self-Aligning NRP Hinge (Outswing Application)
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    Security Tab Hinge (Outswing Application)
  7. [Detail Image]
    Spring-Loaded Hinge

Therma-Tru offers a wide variety of hinges, each specifically engineered to support the operation of the door based on a specific application. Size of door, weight, a glass insert and in-swing or out-swing applications determine the choice of proper hinges.

Learn more about Therma-Tru hinge
options and applications (pdf)
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Divided Lites

A variety of divided lites can enhance the beauty and decorative appeal of an entryway. Available for decorative, privacy and textured, Low-E and clear glass designs.

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Simulated Divided Lites
  • Divided lite look for authentic Craftsman styling.
  • Available for entry or patio doors.
Grilles Between Glass
  • Enclosed between two panes of tempered glass for a premium aesthetic.
  • Smooth glass surface is easy to clean.
Removable Wood Grilles
  • Traditional look that can match exterior windows.
  • Easily removable for cleaning.
  • Can be stained or painted.
Fixed Grilles
  • Molded as part of the lite frame.
  • Traditional look that can match exterior windows.
  • Can be stained or painted.
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Multi-point Locking Systems & Handlesets

Designed to complement Therma-Tru door styles, the multi-point locking systems feature narrow and wide handleset options available in 7 different finish options and 5 styles to suit personal taste.

  1. Heirloom
  2. Venture
  3. Millennium
  4. Ara
  5. Decade
Beauty and beyond

Not only do Therma-Tru handlesets make an aesthetic statement along with any door system, they are a highly-engineered and integrated part of our multi-point locking system.

Learn more about Therma-Tru multi-point
locking systems and handlesets (pdf)
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A framed glass unit located above an entryway. Transoms come in a variety of shapes.

Note how the decorative glass in the transom maintains its overall look and style, but the pattern adapts to fit the shape of the transom and the width of the entryway to create a cohesive and unified appearance.

Single Door
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Single Door
with Sidelites
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Single Door
with Sidelites
Round Top
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Single Door
with Sidelites
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Foam-filled, flexible strip attaches to the jamb and compresses against the slab when door is closed to seal the entry against air and moisture infiltration. Weatherstrips are available in bronze, stone or white colors.

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Learn more about Therma-Tru Weatherstrips (pdf)
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Seal Pads

These complete the seal between the sill cap, bottom sweep and weatherstrip to help block potential pathways where wind-driven moisture can infiltrate the bottom corner of the door system.

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7-Shaped Corner Seal Pad

This innovative design creates an air pocket that helps prevent a vacuum from forming and wicking moisture up the weatherstrip and into the home.

Learn more about Therma-Tru
corner seal pad options (pdf)
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Door Bottoms

Flexible moulding attached to the bottom of the slab that creates a seal between the slab and sill to help form a barrier against air and moisture infiltration.

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One size does not fit all.

There is a wide variety of active and inactive door bottoms specifically engineered to work with inswing and outswing sills.

[Detail Image] Kerf-Applied Dual-Bulb /
Dual-Fin Bottom Sweep
[Detail Image] Outswing Bottom Sweep
[Detail Image] Kerf-Applied Single-Bulb
Bottom Sweep
[Detail Image] Composite Outswing
Inactive Door Bottom
[Detail Image] Inswing Inactive Door Bottom
[Detail Image] Aluminum Outswing
Inactive Door Bottom
Learn more about Therma-Tru door bottom
options and applications (pdf)
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The astragal is attached to the latch or passive door allowing for a wider opening in double door applications. The astragal covers the margin between the two doors when they are closed, and contains the weatherstrip.

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Available in , Oak-, Mahogany- or Fir-grained stainable coverings, as well as bronze or white paintable options.

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Innovative boot design is engineered to work with the active door bottom to provide an enhanced seal across the sill.

Learn more about Therma-Tru astragals (pdf)
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Door Frame

Often called the jamb, it is the vertical jamb leg and horizontal jamb head. Frames can be made of wood and / or composite materials.

Mullion: A vertical post that divides the sidelites and door slab.

Frame to Sill Options
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Boxed Sill System

Frame divides the sill and runs
to subfloor.

• Door and sidelites built as separate units and joined together.

• Jambs separate the openings and extend to subfloor, separating the individual sills.

• There is a visible gap between sill approaches where they extend beyond the jamb.

• This system also has a divided header.

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Continuous Sill System

Frame sits on top of sill that runs continuously from edge to edge of door system.

• Door and sidelites are built as a single unit.

• Mullion separates the openings, but sits on top of the sill.

• Sill extends entire width of system uninterrupted.

• This system also has a continuous header.

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