Sheldystop makes Class A fire-rated fascia and trim boards for homes in wildfire country. Hand selected, tight grain, kiln dried Western SPF treated with Octabor™ (US Borax™) enhanced, ultra-low VOC Hybrid Alkyd Emulsion™ primer gives these boards the fire protection Montana builders need.
The 15 year substrate warranty backs up what contractors care about — boards that won’t fail when homes face real fire threats. Factory coatings push that protection to up to 25 years.
Fire Protection That Actually Works
Class A fire rating matters when you’re building in the WUI. Sheldystop achieves it with that Octabor™ (US Borax™) enhanced primer system. Borates have proven fire-retardant properties — they char instead of burning, creating a protective barrier.
The kiln dried and coated all six sides for maximum stability approach does double duty. Fire protection on every surface, plus dimensional stability that handles Montana’s freeze-thaw abuse. That six-sided coating keeps moisture from sneaking in the back side and warping your fascia boards two winters down the road.
Fascia Boards, Garage Door Liner, Window/Door Trim — the critical exterior trim pieces that ember showers attack first. Standard applications include Inside and outside corner applications where fire can sneak through gaps.
Product Sizing and Applications
| Product Type | Sizes | Lengths | Applications |
|---|---|---|---|
| Fascia Boards | 1”x4”, 1”x6” | 10 to 20’ | Fascia, window/door trim |
| Corner Boards | 2”x3”, 2”x4” | 10’, 12’ | Inside/outside corners |
| Posts | 4x4 and 6x6 available; 8x8 also available | Up to 20’ long (12’ for 8x8’s) | Structural trim elements |
| Knee Braces | Engineered knee braces | 12” to 4’ | Decorative/structural brackets |
The corner boards feature a Pre-cut drip edge to prevent water intrusion around windows. Smart detail — water damage kills more trim boards than fire ever will.
Texture options run from Smooth, beaded, custom to Comb 4 sides, smooth, and resawn face depending on the product line. The posts come Hollow and structurally certified with ESR-2844, CCMC #13314-R ratings for load-bearing applications.
The Patented joint system – warranted for seam separation addresses the weak point in any trim installation. Joints open up. Water gets in. Rot follows. Their system keeps seams tight through the temperature swings.
Performance That Matters
That ultra-low VOC Hybrid Alkyd Emulsion™ primer serves builders who care about jobsite air quality. No point in protecting against fire if you’re gassing out the crew during installation.
The Minimize splits and checks; prefinished colors available on engineered products means less field touch-up. Pre-finished trim saves labor when you’re racing to button up before winter.
Fire-rated trim costs more than standard pine. No getting around it. But in Montana’s expanding WUI zones, insurance companies increasingly demand fire-resistant materials. Pay now for Class A protection or pay later when coverage gets dropped.
Frequently Asked Questions
Q: What makes Sheldystop boards different from regular trim lumber?
A: The Class A fire rating through Octabor™-enhanced primer treatment, plus coating on all six sides instead of just the face. Standard trim gets primed on one or two sides max.
Q: Can these boards handle Montana winters?
A: The kiln-dried Western SPF base material knows cold weather. Six-sided coating prevents moisture intrusion that causes warping. The 15-year substrate warranty suggests confidence in freeze-thaw performance.
Q: Do fire-rated boards require special installation?
A: Install like regular trim boards. The fire protection is built into the product through the primer system. No special fasteners or techniques required.
Q: What’s the actual fire rating?
A: Class A — the highest rating for flame spread and smoke development. Required by many jurisdictions for new construction in wildfire interface zones.
Q: How long do the factory finishes last?
A: Up to 25 years for factory coatings, 15 years on the substrate itself. That’s assuming proper installation with that pre-cut drip edge doing its job around windows.
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Our building materials specialists can help you find the right Sheldystop products for your project.