“A-Frame of Mind”: A Custom Residence in Powder House Pass

Nestled among the pines of South Dakota’s Black Hills, “A-Frame of Mind”, built by Lighthouse Construction, redefines alpine architecture.  This custom A-frame home perfectly marries geometric clarity with a meticulously layered wood palette, echoing the surrounding landscape. Montana Timber Products proudly supplied a collection of custom-milled profiles and finishes that make this residence a standout example of modern mountain living.

PROJECT DETAILS

Location
Lead, South Dakota – Powder House Pass

Project Type
Custom Mountain Residence

Builder
Lighthouse Construction

Photography
Lighthouse Construction

THE DESIGN CHALLENGE

Crafting a Custom A-Frame with Natural Wood Finishes

The vision for this A-frame home was to create an exterior envelope that not only visually anchors its modern structure and offers exceptional protection, but also boasts seamless finishing integration, flowing from the exterior soffit directly into the dramatic interior ceiling. The key was to achieve a balanced modern rustic look across siding, trims, beams, and soffit, incorporating clean lines, subtle color blocking, and tactile contrast, all while ensuring a cohesive aesthetic from the outside in.

THE SOLUTION

Custom Profiles & Finishes from Montana Timber Products

Montana Timber Products delivered a suite of solutions from two distinguished product lines—ranchwood™ Artisan and AquaFir™—all crafted from  sustainably sourced Douglas Fir. By combining raked, smooth, and re-sawn textures in a coordinated palette, this custom A-frame home boasts a cohesive yet multidimensional façade that celebrates both innovative design and regional character.

PRODUCTS + APPLICATIONS

Application	Product Line	Profile	Texture	Color	Dimensions
Siding	ranchwood™ Artisan	Shiplap	Raked	ash glacier grey	1″ x 6″
Trim (Black)	AquaFir™	Square Edge	Smooth	black	1″ x 4″, 6″, 8″, 12″
Trim (Accent)	ranchwood™ Artisan	Square Edge	Raked	ash glacier grey	1″ x 4″
Interior Ceiling & Soffit	AquaFir™	Custom Bevel T&G	Smooth	yukon	1″ x 6″
Exterior Beams	AquaFir™	Square Edge	Re-Sawn	black	8″ x 12″

SPECIES + GRADE

Siding, Soffit, Ceilings and Trim:  Douglas Fir | Knotty #2Btr

Timber Beams:  Douglas Fir | #1 FOHC

DESIGN CONSIDERATIONS

Blending Rustic Wood Textures with Modern Detail

This custom A-frame home integrates a dynamic array of profiles and stain treatments to create dramatic shadow lines and nuanced surface character.

• Striking Exterior Contrasts: The ranchwood™ Artisan siding’s raked finish in Ash Glacier Grey offers a time-worn patina that harmonizes with the setting, while bold black AquaFir™ trim and beams provide striking, contemporary contrast. This interplay is particularly evident on the garage, where AquaFir Black trim frames the wood panel garage door, which features warm AquaFir Yukon brown panels. This creates a sophisticated contrasting trio against the light Ash Glacier Grey siding.
  • ranchwood™ Artisan: Features a multi-step finishing process for deep color variation and a reclaimed wood aesthetic, perfect for adding warmth to a modern design.
  • AquaFir™: Crafted for versatility, ideal for sleek, natural wood exterior detailing that complements contemporary architecture.
• Seamless Wood Integration, Inside and Out: The exterior soffit, finished in AquaFir Yukon, seamlessly extends the home’s aesthetic, visually connecting with the massive A-frame interior ceiling paneling in AquaFir Yukon. This creates a cohesive and immersive wood experience throughout the home.
• Douglas Fir: Selected for its sustainability, structural dependability, and striking grain, offering both visual appeal and exceptional price value.
• Custom-Milled Precision: Custom-milled siding, trim, and soffits ensure a precise fit and perfect color coordination, resulting in visually clean and architecturally rigorous transitions between planes and materials.
• Built to Endure: All wood is prefinished with high-performance, Seal-Once water-based sealant, providing industry-leading resilience against moisture, sun, and seasonal changes. This finish is also ideal for interior applications, ensuring a healthy living environment. This commitment to quality ensures longevity and beauty for years to come.

THE RESULT

Distinctive Custom A-frame Architecture with Enduring Materials

“A-Frame of Mind” exemplifies how the marriage of material quality and thoughtful design delivers both immediate curb appeal and long-term satisfaction. The home’s exterior fuses mountain-modern lines with warm, natural textures and robust performance—showcasing the capacity of Montana Timber Products’ customizable wood solutions to elevate any signature project.

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A Flathead Lake retreat showcasing the perfect blend of modern architecture and authentic Montana character

The Mountain Modern Lake Home, a collaboration between Cushing Terrell (Architect) and Gallatin Construction, is a striking example of how thoughtful material selection and architectural vision can create a lakeside retreat that is both contemporary and deeply rooted in its Montana setting. Set along the iconic shores of Flathead Lake, this custom home blends reclaimed timbers with a curated palette of Montana Timber Products’ ranchwood™ Artisan finishes, offering a seamless transition between indoor and outdoor living.

ranchwood™ Artisan’s multi-step finishing process ensures each board complements the depth and patina of the architectural reclaimed elements, creating a story-rich interior and exterior that honors Montana’s building traditions.

PROJECT DETAILS

Location
Flathead Lake, Montana

Project Type
Custom Lakefront Residence

Architect
Cushing Terrell

Builder
Gallatin Construction

Photography
Heidi Long

Species + Grade
Western Red Cedar (STK – Select Tight Knot)

Main House:

• Siding: 1″ x 8″ Shiplap with ⅛” Reveal | ranchwood™ Artisan Glacier Grey
• Trim: 1″ x 4″ Square Edge | ranchwood™ Artisan Dusk
• Interior Ceiling: 1″ x 6″ T&G | ranchwood™ Artisan Ash

Barn:

• Siding: 1″ x 8″ Shiplap with ⅛” Reveal | ranchwood™ Artisan Glacier Grey
• Trim: 1″ x 4″ Square Edge | ranchwood™ Artisan Dusk
• Slider Door: 1″ x 8″ Shiplap | Corral Board (Authentic Reclaimed)

THE DESIGN CHALLENGE

A Wood Siding Envelope to Complement Authentic Reclaimed Timbers

Cushing Terrell and Gallatin Construction envisioned a Flathead Lake retreat that balanced modern architectural lines with the area’s natural beauty. The primary challenge was selecting a wood siding package that would seamlessly complement the home’s existing, authentic reclaimed structural timbers, which featured not just one, but two distinct color tones.

At Montana Timber Products, we meet the needs of our clients, one job at a time. This project presented a unique opportunity for our ranchwood™ Artisan line, which was meticulously crafted for this very purpose. Three specific finish combinations were selected—Glacier Grey siding, Dusk trim, and Ash for interior ceilings. This unified aesthetic not only honors the home’s heritage but also provides the durability required for Montana’s demanding lakeside climate.

Have a complex design vision or a unique material challenge? We invite you to put our expertise to the test.

THE SOLUTION

ranchwood™ Artisan Finishes | Premium Western Red Cedar Siding

Montana Timber Products delivered a complete wood package featuring three carefully coordinated ranchwood™ Artisan finishes. The Glacier Grey siding paired with Dusk trim creates subtle contrast and architectural depth across both the main house and barn. Inside, the Ash-finished ceiling brightens living spaces while showcasing the craftsmanship of the timber framework.

DESIGN CONSIDERATIONS

Authentic Wood Character, Modern Reliability
The ranchwood™ Artisan series replicates the subtle variation and weathered beauty of genuine reclaimed wood without the sourcing challenges of antique materials. This approach delivered the timeless aesthetic that harmonizes with Flathead Lake’s historic architecture while providing the consistency and performance of kiln-dried Western Red Cedar.

Seamless Integration
The multi-step ranchwood™ Artisan finishing process ensures each new board complements the depth and patina of the home’s reclaimed structural elements, creating a unified exterior that tells Montana’s building story.

Built to Last
All materials feature Seal-Once protection—an industry-leading, non-toxic waterproofing system that provides superior moisture resistance and environmental safety. This advanced finish ensures the home maintains its beauty and structural integrity through every Montana season.

THE RESULT

Premium Lakefront Construction: Durable Wood Siding Package for Montana Climate

The Mountain Modern Lake Home stands as a testament to the power of combining contemporary architecture with authentic Montana materials. It’s a home that is as inviting as it is enduring, perfectly suited for lakeside living on Flathead Lake. Discover how Montana Timber Products can bring your vision to life.

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Photography Credit: Heidi A Long

A 2024 COBA Tour of Homes “Best of Show”

The Westgate Modern residence in Bend, Oregon, by Deschutes Custom Homes, is a testament to exceptional design, thoughtful material selection, and cutting-edge fire safety. As a 2024 COBA Tour of Homes “Best of Show” winner, this custom luxury home showcases how prefinished natural wood, paired with advanced fire protection, creates a residence that is both stunning and resilient in the high desert environment. The ranchwood™ Yellowstone finish is used seamlessly across the interior and exterior of the home, a color selected to blend with the surrounding sagebrush, creating a harmonious and integrated aesthetic.

PROJECT DETAILS

Location
Bend, Oregon

Project Type
Custom Luxury Residence

Builder
Deschutes Custom Homes

Architect
CKA Architects


Applications + Products:
Vertical Siding: 1×8 Western Red Cedar (STK) | Wire Brushed | Shiplap with 1/4″ Reveal | ranchwood™ Yellowstone | FX LumberGuard XT

Exterior Soffit: 1×4 Douglas Fir #2 Btr | Smooth | Tongue & Groove | ranchwood™ Yellowstone | FX LumberGuard XT

Interior Ceiling: 1×6 Douglas Fir #2 Btr | Smooth | Tongue & Groove | ranchwood™ Yellowstone

Rake Fascia: 2×10 Western Red Cedar (STK) | Wire Brushed | Square Edge | ranchwood™ Yellowstone | FX LumberGuard XT

Rake Fascia Trim: 1×6 Western Red Cedar (STK) | Wire Brushed | Square Edge | ranchwood™ Yellowstone | FX LumberGuard XT

Eave Fascia: 2×6 #1 Douglas Fir FOHC | Resawn | Square Edge | ranchwood™ Yellowstone | FX LumberGuard XT

Frieze Blocking: 2×6 #1 Douglas Fir FOHC | Resawn | ranchwood™ Yellowstone | FX LumberGuard XT

Rafter Tails: 6×10 #1 Douglas Fir FOHC | Resawn | ranchwood™ Yellowstone | FX LumberGuard XT

Balcony Rafters: 4×8 #1 Douglas Fir FOHC | Resawn | ranchwood™ Yellowstone | FX LumberGuard XT

Porch Beams: 6×10 #1 Douglas Fir FOHC | Resawn | ranchwood™ Yellowstone | FX LumberGuard XT

THE VISION

A Modern Retreat with Fire-Safe Craftsmanship

Deschutes Custom Homes embarked on a mission to create a contemporary mountain residence that seamlessly marries natural textures with clean, modern lines. A critical aspect of their vision was meeting stringent fire safety requirements without compromising on design. The objective was clear: craft a home that feels timeless and deeply connected to its surroundings, with wood elements that not only echo the high-desert landscape but also stand up to its unique environmental challenges.

THE SOLUTION

Cohesive Natural Wood Palette with Class A Fire Protection

Montana Timber Products supplied a full exterior and interior wood package, all factory-finished with ranchwood™ Yellowstone and treated with FX LumberGuard XT, a transparent, Class A topical fire retardant. This approach ensures each element-from the wire-brushed cedar siding to the resawn Douglas Fir beams-delivers both visual warmth and critical fire resistance. The result is a seamless, modern exterior and interior envelope, unified by color and texture, and engineered for lasting performance in wildfire-prone regions.

FX LumberGuard XT provides permanent, ASTM- and IBC-compliant fire protection with minimal impact to the natural look or workability of the wood, supporting both code compliance and design intent.

DESIGN CONSIDERATIONS

Balancing Modern Aesthetics and Wildfire Resilience

• Design Integration: The close collaboration between Deschutes Custom Homes, CKA Architects, and Montana Timber Products resulted in a home where every wood detail is intentional. From the elegant vertical shiplap siding to the exposed rafter tails, each element contributes to the overall aesthetic. The ranchwood™ Yellowstone finish was specifically chosen for its ability to highlight the wood’s inherent grain and texture, and its harmonious integration with the surrounding high desert landscape.

• Material Cohesion: Utilizing a single finish and fire treatment across all exterior and interior wood elements creates a visually unified look, contributing to the home’s contemporary appeal and simplifying installation, as well as, long-term maintenance.

• Fire Safety: FX LumberGuard XT is a non-toxic, non-corrosive, and environmentally safe fire retardant, meets rigorous  Class A standards, offering  peace of mind for homeowners in wildfire-prone areas.

Westgate Modern stands as a compelling testament to the power of combining natural wood beauty with advanced architectural envelope protection. It’s a home that is both visually stunning and impeccably prepared for the challenges of its environment, truly embodying the spirit of high desert luxury living.

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Project Gallery

photographer: Kayla Mckenzie

Inspired by Nature, Crafted for Durability

Mountain Living’s May/June 2025 issue (page 95) features the “Animal Instincts” home, highlighting how thoughtful design and material choices create a strong connection between the architecture and its natural surroundings. The project in Black AquaFir demonstrates how careful attention to detail can blend a modern home seamlessly into the Wyoming landscape.

PROJECT DETAILS

Location
Alta, Wyoming

Project Type
Private Residence

Builder
Wilkinson-Montesano Builders

Architect
Baldridge Architects


Applications + Products:
Fascia: 1″x8″ | AquaFir™ | Black | Wire Brushed | Square Edge

Wood Siding: 1″x6″ | AquaFir™ | Black | Wire Brushed | Shiplap

Soffit: 1″x6″ | AquaFir™ | Black | Wire Brushed | Tongue & Groove 


Species & Grades:
Kiln-Dried Douglas Fir | #2Btr

THE VISION

A Modern Retreat Rooted in Nature

The homeowners envisioned a space that would celebrate the drama and serenity of the wild, drawing inspiration from the instinctual beauty of animals and their environments. The goal: a home that feels both timeless and contemporary, where natural wood and expansive windows invite the outdoors in.

“the 4,838-square-foot dwelling is deceptively simple, nestling into the scenery unobtrusively. It presents as a long, one-story home clad in Douglas fir with a metal roof and lots of windows. A large glass-fronted dormer, however, hints at the interior’s complexity”

THE SOLUTION

Single Story, Modern Clean Lines, Natural Wood Siding in Black AquaFir™

Black was chosen for its deep, rich finish and ability to highlight the natural grain and texture of Douglas Fir to shine through. This prefinished siding, soffit, and fascia provide a cohesive, modern look while offering durability and low maintenance-ideal for mountain climates. The consistent use of AquaFir™ Black across all exterior wood elements creates visual unity, paired with a large glass dormer, perfect for wildlife viewing. 

AquaFir™ is crafted for versatility, allowing for custom profiles and applications that meet the unique needs of any design. Manufactured in the USA, each board is prefinished and sealed for lasting protection, simplifying installation and ensuring a premium result.

DESIGN CONSIDERATIONS

Harmonizing Natural Beauty and Modern Functionality

Design Integration – The collaboration between Baldrige Architects (a Forbes Top 200 Residential Architect) and Wilkinson-Montesano Builders resulted in a home where every detail is intentional. The dark, semi-transparent finish of AquaFir™ Black was chosen to create a striking silhouette allowing the natural wood grain to remain visible and tactile. This was paired with a simple gable roof to create a clean line within the landscape.

Material Cohesion – Using AquaFir™ Black for siding, soffit, and fascia creates a seamless exterior envelope, enhancing the home’s modern lines and ensuring visual unity across all elevations.

Easy, Eco-Friendly Upkeep – AquaFir™ Black’s water-based stain can be quickly reapplied (brushed or sprayed) onto siding, soffit, or fascia for touch-ups-no heavy prep or harsh chemicals needed. This makes on-site maintenance simple and environmentally conscious, with lower VOCs than oil-based stains

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Natural Wood Siding Manufactured in USA with Versatility and Value

Set against the dramatic pines of Flagstaff, Arizona, this custom home is a showcase of how thoughtful material choices can elevate both style and substance. The homeowners set out to create a residence that would feel both timeless and fresh, and the result is a striking example of how prefinished natural materials can deliver on both aesthetic and value.

PROJECT DETAILS

Location:
Flagstaff, Arizona

Project Type:
Custom Private Residence

Builder:
JIRSA CONSTRUCTION, INC
Instagram

Applications + Products

• Horizontal Wood Siding: 1″x8″ | AquaFir | Owyhee | Ship Lap | smooth texture
• Board and Batten Siding: 1″x8″ Boards | AquaFir™ | Owyhee | Square Edge | smooth texture;
  1″x4″ Battens | AquaFir™ | Owyhee | Square Edge | smooth texture
• Wood Corner, Window, and Door Trim: 1″x4″ | AquaFir™ | Owyhee | Square Edge | smooth texture
• Window and Door Heads + Sills: 1″x6″ | AquaFir™ | Owyhee | Square Edge | smooth texture
• Fascia: 2″x8″ | AquaFir™ | Owyhee | Square Edge | smooth texture
• Garage Door Header: 2″x10″ | AquaFir™ | Owyhee | Square Edge | smooth texture
• Horizontal Band: 1″x10″ | AquaFir™ | Owyhee | Square Edge | smooth texture

Species & Grade

Kiln-Dried Douglas Fir | #2Btr

THE VISION

Elevated Warmth Tucked Away In Hi-Desert Pines

The homeowners wanted a home that radiated the inviting character of natural wood, but with a crisp, modern edge. Their vision was to create a space that felt both welcoming and sophisticated—where the beauty of wood could be celebrated without feeling heavy or old-fashioned.

THE SOLUTION

AquaFir™ The Art of Adaptability

This is our first design story featuring AquaFir™ in Owyhee. This brown, finished in a smooth texture, proved to be the ideal choice for this project. Its versatility allowed the design team to use the same high-quality Douglas Fir across multiple profiles and applications, from horizontal siding to board and batten, trim, fascia, and even garage door headers. This continuity of material creates a cohesive look, while the semi-transparent finish lets the natural grain and knots of the wood take center stage.

Unlike engineered products that can sometimes feel artificial, AquaFir™ brings an unmistakable authenticity. The prefinished surface not only enhances the wood’s natural character but also provides lasting protection—delivering both beauty and durability in one package. The adaptability of AquaFir™ meant the design could shift seamlessly between traditional and contemporary elements, giving the home a unique personality that stands out in any setting.

DESIGN CONSIDERATIONS

Enduring Natural Wood Appeal, Practical Value

Lasting Style – AquaFir™ prefinished Douglas Fir delivers a look that’s both fresh and timeless, infusing the home with natural warmth and a refined finish that sets it apart.

Built-In Value – Opting for prefinished AquaFir™ Douglas Fir not only ensures lasting value but also simplifies the building process with ready-to-install materials, eliminating the need for on-site staining and saving valuable time and resources.

Design Freedom – AquaFir™’s remarkable versatility empowered the design team to tailor every detail to the homeowners’ vision, resulting in a home that inspires admiration today and for years to come.

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Thermally Modified Siding with Charred Cedar Soffit

PROJECT DETAILS

Location:
Coeur D’Alene, Idaho

Project Type:
Lakefront Residence

Architect:
d’Zign Group

Applications + Products

• Siding: Thermally Modified CVG | AquaFir | Charcoal | Wire Brushed | 1×8 Tex Gap
• Soffits: Western Red Cedar CVG | Charwood | Tiger | 1×6 Beveled T&G WP4
• Trim: Thermally Modified CVG | AquaFir | Charcoal | Wire Brushed | 1×3 & 1×4 Square Edge

THE VISION

A Bold Lakeside Statement: Harmonizing Modern Design with Natural Beauty

The vision for this striking lakefront residence was to create a bold, modern statement that honors its pristine setting. d’Zign Group aimed to design a home that captures the expansive views of Coeur D’Alene Lake while harmonizing with the surrounding evergreen forest. The goal was to achieve a seamless blend of rustic warmth and contemporary sophistication through the thoughtful use of natural materials and strong architectural lines.

THE SOLUTION

Premium Wood Products Deliver a Striking, Sustainable Design

Montana Timber Products provided a comprehensive wood solution that met both the aesthetic and performance requirements of this ambitious project. The use of thermally modified Clear Vertical Grain (CVG) AquaFir for siding and trim offered the perfect combination of beauty and resilience. The charred finish added a sophisticated, modern touch while enhancing the wood’s natural resistance to weathering and insects.

For the soffit, Clear Vertical Grain Western Red Cedar was selected, providing a complementary aesthetic and leveraging cedar’s inherent resistance to decay. The Charwood finish unified the soffit with the overall design scheme.

DESIGN CONSIDERATIONS

Coeur D’Alene Showcases Montana Timber Products’ Premium Materials

1. Climate Adaptation: The thermally modified Aquafir was chosen for its enhanced stability and moisture resistance, crucial for the lakefront setting.
2. Aesthetic Cohesion: The charred finish and wire-brushed texture create a captivating interplay of light and shadow, unifying the home’s exterior.
3. Sustainability: By using locally sourced, sustainably produced materials, the project aligns with environmental stewardship goals.

This Coeur D’Alene residence showcases how Montana Timber Products’ premium materials can elevate architectural design, creating a home that is not only visually stunning but also durable, sustainable, and perfectly attuned to its environment.

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Project Details

Location
Malaga, WA

Project Type
Private Residence

Applications + Products

• Horizontal Siding: 1″x8″ AquaFir™ Shiplap in Cascade color, wire-brushed texture
• Soffits: 1″x6″ AquaFir™ T&G in Driftwood color, smooth texture
• Interior Ceilings: 1″x6″ AquaFir™ T&G in Driftwood color, smooth texture
• Trim: 1″x4″ AquaFir™ Square Edge in Cascade and Driftwood colors, wire-brushed texture

Species + Grade

• Kiln Dried Douglas Fir | Knotty #2btr

THE VISION

Seamless Integration with Natural Elements

The architects envisioned a residence that would celebrate the breathtaking views of Malaga, Washington while providing a comfortable, modern indoor environment. Central to this vision was the careful planning of a built environment that would seamlessly blend in with the natural world around it, incorporating natural materials to foster a strong connection between indoor and outdoor spaces.

THE SOLUTION

A Range of Wood Finishes For This Tranquil Retreat

To bring this biophilic design vision to life, the design team skillfully matched the blonde natural wood aesthetic of the interior ceiling paneling to the cabinetry package. Then continued the look to the exterior soffits for a seamless monochromatic design integration.

The combination of selected colors paired perfectly with this home’s design vision and nature-inspired elements. The combination of horizontal siding, soffits, and trim pieces were all crafted out of Douglas Fir from the Pacific Northwest.

Design Considerations

• Material Integration: The AquaFir™ wood cladding was thoughtfully integrated with adjoining materials, creating a seamless transition between different natural elements of the home’s exterior and interior. This careful integration enhances the overall aesthetic and ensures a cohesive architectural design and visual appeal felt throughout the residence.
• Functional Biophilic Design: The wood cladding not only serves as a protective exterior layer but also contributes to the biophilic design of the home. By incorporating natural building materials, textures, and colors, the design creates a strong connection between indoor and outdoor spaces, promoting well-being and a soothing atmosphere.
• Interior-Exterior Flow: The use of AquaFir™ in exterior siding and interior elements helps blur the boundaries between inside and outside, creating a fluid living experience enriched by natural light. This seamless transition encourages residents to engage more fully with their surroundings and enjoy the benefits of indoor-outdoor living.
• Strategic Wood Placement: The architectural design carefully considered the placement of wood elements to maximize their visual and functional impact. From the horizontal siding to the soffits and trim, each application of AquaFir™ was thought out to enhance the home’s architectural features and create a harmonious overall biophilic design.

This stunning residence showcases the versatility of Montana Timber Products’ AquaFir™ line, demonstrating how thoughtful material selection and application can create a visually striking home deeply connected to its surrounding natural environment.

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Wood brings unmatched natural beauty and versatility to homes, commercial buildings, and outdoor spaces. However, its inherent flammability makes fire protection a priority for property owners and builders. A common and critical question is: ‘Is pressure treated wood fire resistant?’ It’s vital to understand that while standard pressure-treated wood offers resistance to rot and insects, it is not inherently fire-retardant and remains combustible. Understanding the latest fire-retardant wood treatments and certification options is crucial for both safety and code compliance. This article will discuss the differences between these two treatments, their benefits, and their compliance with Class A Fire Rating and Wildland Urban Interface (WUI) regulations.

Benefits of Utilizing a Fire Treatment

1. Enhanced safety: Reduces flame spread and smoke development.
2. Code compliance: Meets requirements for Class A Fire Rating and Wildland Urban Interface (WUI) standards.
3. Durability: Treatments improve wood’s resistance to fire and weathering.
4. Aesthetics: Maintains the organic look and feel of genuine wood.

What Are The Fire Rating Classifications?

The following is a basic overview of the fire rating classifications. The index values measure how fast and how far flame will spread over a certain material. Selecting the right fire-retardant product depends on fire rating requirements and local building codes. The ASTM E-84 (Standard Test Method for Surface Burning Characteristics) is commonly used to certify building products.

Class A (or Class 1) Fire Rating

The best fire resistance with the slowest flame spread index between 0-25.

Class B (or Class 2) Fire Rating

Moderate fire resistance with the flame spread index between 26-75.

Class C (or Class 3) Fire Rating

Meets minimum standard with the flame spread index between 76-200.

Wildland Urban Interface (WUI) Compliance

In wildfire-prone regions, meeting Wildland Urban Interface (WUI) standards is crucial. As defined by the U.S. Fire Administration, the WUI is:

“The zone of transition between unoccupied land and human development. It is the line, area or zone where structures and other human development meet or intermingle with undeveloped wildland or vegetative fuels.”

To achieve both a Class A rating and WUI compliance, materials must be ignition resistant, capable of resisting ignition from flying embers or radiant heat during a wildfire.

Pressure-Treated Fire Retardant (FRTW)

Unlike standard pressure-treated wood that protects against decay, pressure-treated fire retardant involves placing the wood in a high-pressure vessel where specific fire-retardant chemicals are forced deep into the wood fibers.. This deep-penetration method results in excellent, long-lasting protection against fire, rot, and insects.

Advantages:

• Achieves and maintains Class A fire rating
• Often required for WUI compliance
• Durable and well-suited for demanding climates and high-risk zones

Considerations:

• Typically more expensive than other methods
• May slightly alter wood color, making it a shade or two darker

Is “Pressure-Treated” the Same as Fire-Treated?

Note, the use of pressure is a part of this fire retardant application process; but, “pressure-treating” wood doesn’t necessarily make it a non-combustible material. For instance, the “pressure-treated” wood at your local lumber yard might have a higher resistance to rot and decay; but, it doesn’t mean it was additionally treated for fire resistance.

Topical Fire Treatment

A fire-retardant coating is applied to the surface, typically sprayed to the wood after milling but before finishing and installation. This surface barrier slows ignition and flame spread.

Advantages:

• Cost-effective solution for projects requiring only Class A certification
• Minimal visual impact—any color change is usually subtle, depending on stain and wood species
• Can be applied in-house, possibly shortening lead times

Considerations:

• Not always suitable for WUI compliance; check with local authorities
• May require reapplication if finish is sanded or removed

Will Fire Treatments Affect The Look Of Wood Siding?

Pressure treatment and spray-applied methods may both result in slight color changes. Pressure-treated wood is often a shade darker, while topical treatments can create very subtle shifts, especially with lighter stains. Always request finished samples for final approval and visual consistency.

Which Fire Retardant Solution is Best For You?

Your optimal fire-retardant wood treatment depends on:

1. Project location: WUI requirements vs. standard Class A compliance
2. Budget: Pressure treatment is generally pricier than spray-applied
3. Aesthetic preferences: Review control samples to assess any finish variations
4. Timeline: Onsite spray treatments may offer shorter lead times

While eliminating wildfires is not possible, there are viable options, while still using a renewable product like natural wood to help protect your property. Home hardening, which includes implementing fire-resistant exteriors and defensible spaces around structures, is a great first plan of action.