WindsorONE 2×4 Trim Board

SKU: N/A

Actual size 1 7/16″ x 3 1/2″. Factory primed finger jointed wood for heavy casing, post wraps, pergola members and beam trim, warranted 30 years against rot and insects. See the board size guide for how this compares with our other boards.

Actual size — nominal 2x4 8 options
SpeciesProfileThicknessWidthCode
C/BTR Fir — 1 7/16" 3 1/2" 2X4FIR
Poplar thickest 2x we stock S4S 1 3/4" 3 1/2" 2X4POP
WindsorONE Protected S4S 1 7/16" 3 1/2" 2X4RPS4S
WindsorONE Protected 16ft & 20ft S1S2E 1 7/16" 3 1/2" 2X4RPS1S2E
Primed FJ Cedar 16ft & 20ft S4S 1 7/16" 3 1/2" 2X4S4SPRIMEDCEDAR
Green 16ft — 1 7/16" 3 1/2" 2X4GREEN
Flexible FJP per ft — 1 7/16" 3 1/2" 2X4FLXFJP
Flexible per ft S4S 1 7/16" 3 1/2" 2X4FLXS4S

2 different thicknesses at 2x4: 1 7/16", 1 3/4". 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 – 2 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 2×4 Trim Board

This is where people get caught out. It is called a 2×4 but it is not the 2×4 from the framing pile. WindsorONE 2×4 measures 1 7/16″ thick by 3 1/2″ wide, and it is built for heavy casing, post wraps, pergola members and beam trim.

It is wood, finger jointed for stability, so none of the usual PVC compromises apply. You are buying it primed, which removes a full day from most trim schedules. Rot, insect damage and mould are covered for 30 years.

Take S4SSE for crisp painted trim, or S1S2E when matching older rough sawn work.

Treat every saw cut as a new surface that needs primer.

It measures 1 7/16″, a sixteenth under framing stock, which matters if it meets structural timber. See 2×4 boards. If the width is not right, WindsorONE 2×2 is the next size down and WindsorONE 2×6 the next size up. Check the board size guide if you need to match an existing board.

If it is going next to structural 2×4, hold a piece of each together first. The 1/16 inch will show at the joint.

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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