Alliance Door Products

Alliance Door Products supplies residential, commercial and architectural doors, with pre-hanging, custom machining and prefinishing to go with them. That combination is the reason to order a door this way: you choose the door and its preparation together, so it arrives ready for the opening instead of needing a day of shop work on site. Getting those decisions settled together matters when you are replacing a houseful of interior doors or closing in a new build before Montana’s fall freeze.

The company is privately held, family-owned and family-operated, founded in Lynden, Washington. Its portfolio includes Lynden Door, Plastpro, Simpson Door, Goldberg and Assa Abloy.

Lynden Door interior doors

Lynden Door is a third-generation, family-owned Pacific Northwest company that builds residential, commercial and architectural doors, and it is the interior line to know in the Alliance catalog.

The residential SD Series gives you a choice of hollow or solid cores. Decide on the core before you get caught up in the panel style. The face is what you see, but the core is what you feel every day: a solid core closes with weight, quiets a bedroom next to a hallway, and takes a hardware change later without complaint.

Lynden Door’s FineLine collection uses grooved profile lines to give contemporary rooms some definition. That is a good way to add detail without making the door the busiest thing in the room. FineLine comes as passage, bifold and double-door systems, and all profiles come in 6-foot-8-inch, 7-foot and 8-foot heights, so the same design carries across different openings. Elemental designs keep clean, simple lines, and select Elemental designs come with vertical ventilation.

For closets, laundry rooms and mechanical spaces that need airflow, the Ventilated Door Collection has Vertical, Locker and Ladder designs. A ventilated laundry door is the right answer in a tight Montana house where the furnace and the dryer share a closet.

Lynden Door offers clear, custom-stain and custom-paint factory finishes, along with automated machining and hardware preparation. Settle the finish and hardware choices early; they belong with the door order, especially when several rooms need to come together.

Core, series and warranty

Winter is the season for interior work in Montana, and a houseful of bedroom, hallway and closet doors goes best as one project: choose the core room by room and coordinate the finish. Match the series to the building use, and know what each one carries:

Series	Building use	Limited warranty
SD Series	Residential	1 year
CD Series	Light commercial	5 years
LD Series	Architectural	Lifetime

Lynden Door also builds neutral- and positive-pressure fire doors for 20-, 45-, 60- and 90-minute applications, which matters the moment a project moves from a house to a garage-to-living-space wall or a commercial job.

Alliance Door Systems fiberglass and steel entry doors

Alliance Door Systems offers fiberglass and steel exterior doors, including Craftsman doors, the Modern Bauhaus Collection, Nova 90 and Nova 90 Onyx. Start with the architecture of the house, then work through the door construction, glass and system components.

The featured fiberglass doors use Plastpro HydroShield technology, which puts a composite barrier around all six sides of the door to protect against moisture and humidity infiltration. Six-sided protection is a detail worth buying when snow collects at an entry and melts against the door all winter. A full-length laminated veneer lumber lock stile takes any type of lock, and the 8-foot doors add a steel bar to the LVL for rigidity.

In the Flathead Valley, average winter lows of 16°F make the bottom seal worth your attention. The Endura Z-Articulating Cap Sill and sweep adjusts automatically, and Endura door bottoms combine fins and bulbs for a larger sealing area. Look at that assembly as closely as the door face. A handsome entry still needs careful attention where the slab meets the sill, and the FrameSaver frame bottom carries a fully transferable lifetime limited warranty.

Alliance Door Systems uses ODL doorglass with two panels of tempered safety glass. Decorative glass textures affect light and privacy, so choose for what you want people to see through the entry as well as how it looks from the road. Steel security reinforcement plates are among the system components when the entry needs more than a deadbolt.

For Montana’s fall rush to close in before the freeze, settle the door, glass, hardware and preparation together. Pre-hanging and custom machining are what make that order quick and worry-free at the job site.

Finishes and matching millwork

Lynden Door belongs in the discussion when you want the doors and surrounding woodwork to look planned together. Matching wood jambs and millwork can be ordered with the doors, which is worth doing in a Montana timber-frame or log home where the surrounding wood is a large part of the room.

The Pacific Collection offers eleven standard finish choices, including clear, across ten natural wood-veneer species, in a VOC-free, ultraviolet-cured finish. StileLine comes with Pacific Collection stains or a clear factory finish. Choose the wood and finish together, from a stain veneer sample rather than a brochure page; the grain is part of the finished appearance.

Why Alliance Door Products

Buy an Alliance door for the combination of door choice and preparation: Lynden Door interiors in the core and finish you want, Plastpro fiberglass entries built to shed Montana snowmelt, and pre-hanging, machining and prefinishing done before the door reaches the site. That is useful whether you are updating rooms through a Montana winter or getting an entry closed in before the freeze.

Frequently Asked Questions

Should I order solid-core or hollow-core interior doors?

Lynden Door’s residential SD Series comes either way. Choose solid core for bedrooms, bathrooms and any door next to a living space, where the weight quiets the room and the door holds hardware for the long run. Hollow core is fine for closets and rooms where sound and heft do not matter, and it saves weight on a wide bifold.

Is a fiberglass entry door better than steel for a Montana house?

Both come through Alliance Door Systems. Fiberglass with Plastpro HydroShield seals all six sides of the door against moisture, which is the problem an entry faces when snow sits against it and melts. Fire-rated doors come in both steel and fiberglass; steel is the choice when the entry needs a security reinforcement plate. Whichever you pick, the Endura sill and sweep at the bottom decide how much cold air gets in.

Does Alliance Door Products pre-hang and prefinish doors?

Yes. Pre-hanging, custom machining and prefinishing are part of what Alliance supplies, and Lynden Door’s factory finishes include clear, custom stain and custom paint. Order the door with its hinges, bore and finish specified and it arrives ready for the opening.

What warranty do Alliance doors carry?

It depends on the maker and the series. Lynden Door’s residential SD Series carries a one-year limited warranty, the light-commercial CD Series five years, and the architectural LD Series a lifetime limited warranty. Alliance points to each manufacturing partner’s own warranty for the exterior lines, and the FrameSaver frame bottom carries a fully transferable lifetime limited warranty.