WindsorONE

WindsorONE trim is primed wood trim boards, moldings and beadboard for trimming out a house, from fascia and exterior trim to casing, base and crown inside. Every board arrives with the prime coat already on, so you cut, nail and go to finish paint. It’s made for finish carpenters and remodelers doing repair-and-remodel work.

WindsorONE grew out of Windsor Mill, which Raymond Flynn founded in 1972, and is headquartered in Petaluma, California. It’s a second-generation family-owned business run by Craig Flynn, with Brightstar Capital Partners investing in 2022 to expand its operations. The company controls production from the tree in the forest to the finished board and makes all of it in its own mills in Willits, California and Surry, Virginia.

Protected and Traditional trim boards

The flat trim boards, listed as S4SSE, come in two kinds, and the stamp on the back tells you which. Protected boards carry a “WindsorONE Protected” or “WindsorONE+ Protected” stamp and are made for trim, fascia and other trim on houses and larger commercial buildings. Traditional boards carry a “traditional” stamp and come with WindsorONE’s separate limited Traditional warranty. For fascia, rake boards, corner boards and anything else that lives outside, use Protected; Traditional fits work where the 30-year coverage isn’t needed.

Finger-jointed wood outside is where most carpenters hesitate, because the joints are where cheap trim fails first. Protected boards are finger-jointed and glued first, then treated with Woodlife is Inside wood-protecting materials from Kop-Coat against fungal decay and termite damage, and only then primed for exterior exposure, so the treatment goes on after the joints are made. They carry a 30-year limited warranty against rot, insects and mold, 10 years on glued joints and 5 years on the primer, for the first owner. Installing or maintaining them outside WindsorONE’s written instructions voids that warranty, so keep the Exterior Trim Board Installation & Maintenance Manual on the job.

Inside the house, WindsorONE products carry an SCS Gold Indoor Air Quality Rating, so the same boards work for casing and base in a bedroom.

The mistake that costs the most is a few Traditional sticks from the top of a mixed pile ending up in a fascia run. Prime every cut end, since the factory primer stops at the saw cut, and set aside any stick with an open joint or chipped primer. Before a board goes up outside, flip it and read the stamp.

Classical Craftsman moldings

The Classical Craftsman set reproduces trim from about 1900 to 1930, drawn from the Arts and Crafts, Bungalow and Prairie movements: flat, heavy, square-shouldered trim in place of Victorian fuss. The pieces stack into four build-ups. The cornice is crown over picture mold. The door and window header is a header cap over a 1x5 S4SSE board used as the frieze, with a stop mold under it, all sitting on the casing. The stool is a window stool with a cove under its nose and an apron below. The base is a base molding with a base shoe in front.

Buy the whole set for a room instead of mixing in another maker’s profile, since the sizes are drawn to line up with each other. Set a plinth block at the foot of each casing; at 8 inches tall it stands above the base molding, and the base butts into its side.

Part	Model	Size	Where it goes
Crown	WOCM005	3/4” x 4-9/16”	Cornice
Picture mold	WOPM004	3/4” x 1-3/4”	Cornice
Header cap	WOHC001	1-5/16” x 2-1/4”	Header
Trim board/frieze	1x5 S4SSE	3/4” x 4-1/2”	Header
Stop mold	WOST001	7/16” x 1-1/16”	Header
Casing	WOCS003	3/4” x 4-1/4”	Sides of door and window openings, under the header
Window stool	WOWS002	1-1/16” x 4-1/4”	Stool
Cove	WOCV001	3/4” x 7/8”	Stool
Apron	WOCS004	3/4” x 3-9/16”	Stool
Base molding	WOBM003	3/4” x 7-1/4”	Base
Base shoe	WOBS001	1/2” x 3/4”	Base
Plinth block	WOPB001	1-3/8” x 8”	Foot of the casing

Beadboard, shiplap and tongue and groove

WindsorONE’s specialty boards, beadboard, shiplap and tongue and groove, come primed like the trim boards, and beaded casing from the same line trims the openings in a beadboard room. Paint the tongues before the boards go up, so a board that shrinks back in winter doesn’t show a raw stripe.

Frequently Asked Questions

Can WindsorONE trim go both inside and outside?

Yes. The line is made for both interior and exterior trim, from fascia and corner boards outside to casing and base inside. Outside, use the Protected boards and get finish paint on them soon, because the factory prime coat is a base for paint and won’t stand up to weather by itself. Inside, one or two coats of finish paint over the factory primer is all the trim needs.

What does S4SSE mean on WindsorONE trim boards?

It means surfaced four sides, square edge. The board is milled smooth on both faces and both edges, and the corners are left square instead of rounded over. That crisp edge gives Craftsman casing and frieze boards their flat, sharp look and lets butt joints close tight. On exterior work, ease the sharp corners lightly with sandpaper before painting so the paint doesn’t go on thin at the edge.

Can you try WindsorONE Craftsman molding before trimming out a whole house?

Yes. WindsorONE takes sample requests and offers a Craftsman Style Guide you can download as a PDF, which shows how the pieces stack together. Hold a sample against the wall and the door jamb before ordering, since a heavy Craftsman build-up can crowd a narrow hallway or a window set close to a corner.

How should WindsorONE beadboard be installed?

Stack the boards in the room where they’ll go for a few days so they settle to the house’s humidity before you nail them. Boards that go up damp in a house that runs the heat all winter will shrink and open gaps later. Don’t drive the tongue-and-groove joints dead tight, and blind-nail through the tongue so the face stays clean for paint.