WindsorONE 1×4 Trim Board

SKU: N/A

Actual size 3/4″ x 3 1/2″. Factory primed finger jointed wood for window and door casing, corner boards and rake trim, warranted 30 years against rot and insects. See the board size guide for how this compares with our other boards.

Actual size — nominal 1x4 19 options
SpeciesProfileThicknessWidthCode
MDF 17ft — 11/16" 3 1/2" 1X4MDF
MDF 17ft S4S 11/16" 3 1/2" 1X4MDFS4S
Poplar S4S 13/16" 3 1/2" 1X4POP
FJ Poplar Primed S4S 13/16" 3 1/2" 1X4POPPRIMED
Alder S4S 13/16" 3 1/2" 1X4ALD
Knotty Alder thinner than 1x2/1x3 knotty alder S4S 3/4" 3 1/2" 1X4KALD
Northern Red Oak S4S 13/16" 3 1/2" 1X4NRO
Hard Maple S4S 13/16" 3 1/2" 1X4MPL
White Oak plain sawn S4S 13/16" 3 1/2" 1X4WHITEOAK
C/BTR Fir — 11/16" 3 1/2" 1X4FIR
Clear Pine — 3/4" 3 1/2" 1X4SP
WindsorONE Protected 16ft & 20ft S4S 3/4" 3 1/2" 1X4RPS4S
WindsorONE Protected 16ft & 20ft S1S2E 3/4" 3 1/2" 1X4RPS1S2E
Sage FJP S4S 23/32" 3 1/2" 1X4SAGE
Flexible FJP — 3/4" 3 1/2" 1X4FLXFJP
Flexible MDF — 11/16" 3 1/2" 1X4FLXMDF
Flexible MDF 12ft — 11/16" 3 1/2" 1X4FLXMDF12
Flexible per ft S4S 3/4" 3 1/2" 1X4FLXS4S
Knotty Alder T&G beaded ceiling 5/8" 3 1/8" 1X4T&GBCKALD

5 different thicknesses at 1x4: 11/16", 13/16", 3/4", 23/32", 5/8". Check the species before butting materials together.

Note: Mouldings sold per linear foot (LF) are subject to lengths on hand. If special lengths are required, please contact our stores for an inventory check. Order the total quantity of LF desired and an order equaling that total will be assembled.

Shipping and returns

We offer free next-day delivery on orders over $300 within a 50-mile radius of any of our stores. For orders less than $300 within our radius, we charge a $65 delivery fee. For delivery sites outside of our 50-mile radius, we charge a $250 delivery fee, regardless of the amount purchased. Please click here to view a map of our delivery radius.

Product details

Nominal SizeWOS1 – 1 X 4
Wood SpeciesWood type classification to identify material characteristics.
Board Length10′, 16′, 20′, 4″ sample, 8′
Edge ProfileShows whether the board edges are square (sharp) or eased (rounded).S1S2E (1 Side Smooth, 2 Edges Eased)S1S2E (1 Side Smooth, 2 Edges Eased)Reversible, 1 rough sawn side, the rest smooth with 2 eased edges., S4S (Smooth 4 Sides)S4S (Smooth 4 Sides)Smooth on all four sides with crisp, square edges.

Description

WindsorONE 1×4 Trim Board

If a house has exterior casing, there is a good chance it is 1×4. WindsorONE 1×4 measures 3/4″ thick by 3 1/2″ wide, and it is built for window and door casing, corner boards and rake trim.

It arrives primed, so the only finishing left on site is topcoat. Mould, rot and insects all fall inside the 30 year warranty. The finger jointed construction keeps it straight, and being real wood it takes a nail without predrilling.

It comes in S4SSE, smooth on four sides, and S1S2E, which has a rough sawn face and eased edges. Net size is identical.

It runs in 16ft and 20ft lengths rather than the 8ft and 16ft used across the rest of our boards.

Cut ends need priming, and it is the step most often skipped.

It is 3/4″, the same as most solid wood trim, so mixing it with 1×4 boards causes no alignment problem. For a different width, WindsorONE 1×3 is the next size down and WindsorONE 1×5 the next size up. See the board size guide if you want the nominal against actual comparison in full.

Casing is the most visible trim on a facade, which is why the primed finish matters more here than anywhere.

WindsorONE is a premium line of trim boards, mouldings, and specialty millwork known for exceptional craftsmanship, architectural accuracy, and consistently smooth finishes. Every board is precision‑milled, primed, and built to deliver long‑lasting performance for interior and exterior applications. Contractors choose WindsorONE for its reliability, crisp profiles, and superior paint adhesion.

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Nominal vs actual size

Why a 1x4 is not four inches wide, and what you will really receive.

Board size guide

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