WindsorONE Protected S4SSE Trim Boards (1x4 through 1x12, 16' and 20')

WindsorONE Protected S4SSE trim boards solve Montana’s trim rot problem with a 30-year warranty against rot, insects (including Formosan termites), and mold. The boards feature Tru-Core® core-infused preservation technology throughout the wood — not just surface-applied. Available in six standard widths from 1x4 through 1x12 with actual thickness of 3/4” across all sizes, these finger-jointed Radiata Pine boards come smooth on all four sides with square edges (S4SSE).

The boards come in 16’ standard lengths with 20’ available by inquiry. Three coats of factory-applied 100% acrylic latex primer provide an industry-leading finish right out of the bundle. For contractors dealing with Montana’s freeze-thaw cycles, moisture extremes, and short construction season, these protected boards offer measurable advantages over standard primed lumber.

Core Protection and Performance Specs

The Tru-Core® technology infuses preservation throughout the wood core — not just the surface. This matters when boards get cut, drilled, or damaged during installation. The low VOC water-borne primer system earned a Gold Indoor Air Quality rating from SCS Global Services, making these boards safe for interior applications.

Specification	Value
Material	Finger-jointed Radiata Pine, kiln-dried and edge-glued
Thickness (actual)	3/4” across all widths
Width range (nominal)	1x4 through 1x12
Standard length	16’
Special order length	20’
Warranty period	30 years
Warranty coverage	Rot, insects (including Formosan termites), and mold

Installation Requirements That Protect Your Warranty

The 30-year warranty depends on following manufacturer installation guidelines — particularly priming all cut ends before installation. Skip this step and the warranty’s void. Moisture content limits vary by application: exterior installations require board moisture content at or below 18%, while interior applications need acclimation to 8% or less.

Maintain minimum clearances: 6” above grade, 2” above roof sheathing, 1/4” above flashing, with appropriate spacing from porches or hard surfaces. These aren’t suggestions — they’re warranty requirements. Use standard exterior-grade fasteners and adhesives, but avoid high-pressure washing which can drive moisture past the protective barriers.

The finger-jointing and kiln-drying process creates dimensional stability that resists the warping and twisting common with solid lumber in Montana’s temperature swings. No visible finger joints appear on the face, maintaining a smooth finish for paint application.

Where Protected Trim Earns Its Premium

Exterior applications include fascia boards, soffits, corner boards, window and door trim, rake boards, band boards, and column wraps. Interior uses span decorative trim, wainscoting, baseboards, and casing. The protected core makes sense anywhere moisture infiltration causes premature failure — think north-facing fascia that stays damp, soffits prone to ice damming backup, or trim around entry doors taking snow load abuse.

Don’t use these boards for load-bearing applications, high-moisture items like handrails, planters, pergolas, decking, or siding in direct ground contact. The protection works for trim applications, not structural elements or constant water exposure.

WindsorONE Protected trim integrates with all WindsorONE exterior molding profiles including shingle mold, brick mold, and water tables. The boards accept standard exterior and interior paints and work alongside other WindsorONE families like Shiplap and Tongue & Groove.

The finger joint technology ensures straightness, tightness, and true profiles, saving time and money on the job site. For Montana contractors fighting short build seasons, factory-primed boards that stay straight matter more than marketing claims.

FAQs

How does WindsorONE Protected compare to PVC trim?

PVC is rot-proof but can be harder to paint and has high thermal expansion; WindsorONE Protected provides a 30-year rot warranty with the superior look and paintability of real wood. The wood trim holds paint better and doesn’t telegraph expansion joints like PVC in Montana’s temperature extremes.

What about fiber cement trim as an alternative?

Fiber cement is fire-resistant but heavy and requires special blades and handling; WindsorONE is easier to cut and install with standard tools. The weight difference matters when installers work on ladders all day.

Do I really need to prime every cut?

Yes — the warranty is contingent on following the manufacturer’s installation guidelines, particularly priming all cut ends. The core protection works, but exposed cuts create vulnerability points. Prime cuts, maintain warranty.

What’s the difference between S4SSE and S1S2E versions?

S4SSE has 4 smooth sides and square edges; S1S2E is reversible with one rough-sawn side and two eased edges. The S4SSE version suits formal trim applications where consistent smooth surfaces matter. Choose based on aesthetic needs, not performance — both carry the same protection.