Woodtone Cortanium Corners bring one-piece corner construction to residential and multi-family projects, eliminating the field assembly that leads to seam separation and callbacks. These engineered corners eliminate the labor and risk of gaps associated with traditional two-piece built-up corners, while delivering a lifetime limited warranty against rot, decay, and insect damage that specifically covers termites, carpenter ants, and carpenter bees.
The corners come in four sizes — 1″ x 4″, 2″ x 4″, 5/4″ x 4″, and 2″ x 5″ — with a resawn texture on solid SPF (Spruce-Pine-Fir) substrate. TRU-CORE® water-based penetrating treatment protects the wood to its core, while flood-coated primer/sealer on all six sides provides complete encapsulation. For Montana’s freeze-thaw cycles and carpenter ant pressures in forested areas, this combination delivers measurable durability advantages over untreated trim.
TRU-CORE® Treatment and Lifetime Protection
The TRU-CORE® water-based penetrating system backs up Woodtone’s lifetime warranty against rot, decay, and insect infestation. This treatment penetrates to the core of the wood, not just surface-deep like dip treatments or brush-on preservatives.
High resistance to termites, carpenter ants, and carpenter bees matters in Montana’s forested zones. Carpenter ants thrive in moist wood — they’re the reason woodpeckers drill holes in siding. The lifetime limited warranty specifically covers these insects, addressing a real maintenance concern for homes near timber.
| Warranty Coverage | Duration | Source |
|---|---|---|
| Substrate (rot, decay, insects) | Lifetime limited | manufacturer |
| Primer/sealer coating | Up to 25 years limited | manufacturer |
Warranty requires proper installation per manufacturer guidelines, including sealing all end cuts and applying a topcoat within 60 days. Skip these steps and the warranty’s void.
Installation Requirements That Protect Your Warranty
Use fine-tooth hand saws or carbide-tipped power blades for cutting — all cut ends must be sealed with primer or high-quality paint. This isn’t optional. Unsealed end grain wicks moisture and voids the warranty.
Fasten every 24″ staggered or double-nail every 16″ on center using 4d or 6d hot-dipped galvanized or stainless steel nails. The use of staples, T-nails, or countersunk fasteners with heads flush to the surface may void the warranty. Countersinking creates pockets that trap moisture — exactly what the TRU-CORE® treatment aims to prevent.
| Installation Requirement | Specification |
|---|---|
| Storage | Dry, off ground, weather-protected |
| Fastener spacing | 24″ staggered or 16″ double-nailed |
| Fastener type | 4d or 6d hot-dipped galvanized or stainless |
| Topcoat timing | Within 60 days |
| Paint film thickness | Minimum 2.5 mil total |
Apply two coats of high-quality exterior acrylic latex or oil paint within 60 days, maintaining a total dry film thickness of at least 2.5 mil. Apply exterior-quality flexible caulk at all joints and abutments with siding or other building components.
Compatible with natural wood siding, engineered wood siding, vinyl, aluminum, fiber cement, brick, and stucco. The one-piece design works regardless of cladding type.
Who Benefits Most
Contractors tired of callbacks from corner separation should consider these. The engineered profile reduces seam separation and improves water-intrusion resistance compared to field-assembled corners. Available factory-finished to custom colors with a durable top-coat option, eliminating another field step.
Versus PVC or composite alternatives, Cortanium maintains the structural integrity and aesthetic of real wood while providing comparable or superior durability due to the TRU-CORE® treatment. For projects where real wood appearance matters but durability can’t be compromised, these corners deliver both.
The trade-off is upfront cost and strict installation requirements. Follow the fastening schedule, seal every cut end, topcoat within 60 days — or lose the warranty protection. For builders who already follow best practices, these corners reduce callbacks while maintaining the authentic wood look many Montana homeowners want.
Frequently Asked Questions
Q: What happens if I use a pneumatic stapler or T-nailer for installation?
The use of staples, T-nails, or countersunk fasteners with heads flush to the surface may void the warranty. Stick to 4d or 6d hot-dipped galvanized or stainless steel nails to maintain warranty coverage.
Q: Do I really need to seal every single cut end?
Yes. All cut ends must be sealed with primer or high-quality paint. This is a warranty requirement — unsealed end grain provides a moisture pathway that bypasses the TRU-CORE® treatment.
Q: How do these compare to cedar corners for rot resistance?
Cortanium corners offer a lifetime limited warranty against rot and insects, whereas standard wood trim requires more frequent maintenance and is prone to decay. Cedar has natural resistance but no lifetime warranty. The TRU-CORE® treatment provides high resistance to rot, decay, and insect infestation.
Q: Can these be installed directly against masonry?
Yes, they can be fastened to standard structural framing, sheathing, or masonry with appropriate clearances. Follow standard best practices for wood-to-masonry installations regarding moisture barriers and clearances.
Q: What’s the actual difference between one-piece and traditional two-piece corners?
One-piece construction eliminates the need for on-site corner assembly. This eliminates the labor and risk of gaps/seam separation associated with traditional two-piece built-up corners. No miters to cut, no gaps to develop, no seams to separate.
Ready to Get Started?
Our siding specialists can help you find the right Woodtone products for your project.
More from Woodtone
Explore All Woodtone Products
We carry Woodtone across all 11 Montana and Idaho stores.
