Smooth-Star is Therma-Tru's smooth-skin fiberglass line, in raised-panel styles and a Shaker-style family with solid-panel, flush-glazed and simulated-divided-lite designs, in 6 foot 8 inch and 8 foot heights, with sidelites. New for 2026 is a three-quarter-lite flush-glazed Shaker door and sidelites. Factory PrismaGuard paint is available in Therma-Tru's standard color assortment (colors such as Estuary, Alpine, Obsidian, Peregrine, Arctic Ice, Canyon, Elk and Golden Wheat). The smooth surface is made for paint, and the fiberglass will not dent or rust like steel.
It is built on the same polyurethane foam core and complete-system frame as the woodgrain lines and carries Therma-Tru's lifetime limited system warranty, with a 10-year limited warranty on factory PrismaGuard paint. Lumberyard millwork desks order Smooth-Star in the full range of styles and glass.
For most Twin Cities front, side and back doors this is the value pick: order it factory-painted, with Low-E glass in any lite, and let us set the sill so the sweep seals on the first cold night.
Highlights
- Raised-panel and Shaker styles, including flush-glazed and SDL designs
- Factory PrismaGuard® paint in Therma-Tru's standard colors, or paint it yourself
- Decorative, privacy and textured glass options
- Polyurethane foam core; will not dent or rust
- Factory-coated Low-E glass available
- Lifetime limited system warranty; 10-year finish warranty on factory paint
Insulation and energy performance in Minnesota
Smooth-Star insulates with a full polyurethane foam core, so the slab itself is not the weak spot; the glass is. For a Minnesota entry, order factory-coated Low-E in every lite and pick a triple-pane privacy or textured glass, and keep glass area modest on a door that faces the prevailing wind.
Glass packages
- Factory-coated Low-E glass is available in Smooth-Star
- All privacy and textured glass options are triple-pane
- Privacy and textured options include Satin Etch, Chord, Rainglass and Granite
- Decorative glass families, most of them triple-pane
- Advanta Lite Frame clear and privacy triple-pane Low-E options meet ENERGY STAR in all 50 states
Frame and sash
Smooth fiberglass skins over a polyurethane foam core, rated by Therma-Tru at up to four times the insulating R-value of wood; complete door system with matched frame, sill and compression weatherstripping.
Ratings
Therma-Tru states that more than 80 percent of its door and glass combinations are ENERGY STAR qualified and NFRC certified, with options for every state; the Northern-zone rating depends on the lite package you choose.
What the install adds
On install day we set the frame on a sill pan, tape the frame to the housewrap, fill the rough-opening gap with low-expansion foam, and finish the interior with backer rod and sealant so the air barrier is continuous. Exterior joints get backer rod and a quality sealant, and we adjust the sill and strike so the weatherstrip compresses evenly all the way around.
Smooth-Star® at a glance
- Skin
- Smooth paint-grade fiberglass
- Core
- Polyurethane foam
- Styles
- Raised-panel and Shaker styles (solid-panel, flush-glazed, SDL and divider-bar designs); 6 ft 8 in and 8 ft heights; single and double doors with sidelites
- Colors
- Factory PrismaGuard® paint in Therma-Tru's standard assortment, or ready to paint in the field
- Glass
- Clear Low-E, decorative glass, privacy and textured glass (triple-pane)
- Installation
- Prehung complete door system for new construction or full-frame replacement
- Warranty
- Lifetime limited on the door system; 10-year limited warranty on factory PrismaGuard paint
- Where sold
- Lumberyards and millwork distributors
- Made by
- Therma-Tru, Maumee, Ohio; part of Fortune Brands Innovations
Product details summarized from the manufacturer's published materials, last checked 2026-10-09. Options, specifications, and availability vary by configuration and change over time — we'll confirm current options and pricing for your project at your free estimate.
