Arbor Wood Dimensional Lumber - Ash

From $2.99

This product is natural, biodegradable, and free of plastics and chemicals

Board Profile

Arbor Wood dimensional lumber is an eco-conscious, thermally modified wood product perfect for architectural millwork, trim, or most places where extra stability and enhanced beauty is needed.  

Thermally modified wood is real wood, not treated with toxic chemicals or made from plastic.  It's significantly less prone to water absorption, expansion/contraction, and rot or decay than traditional lumber alone.  This makes it very suitable for a variety of applications and allows it to have a long service life.

Thermally modified wood from Arbor Wood is a more sustainable option than fiberboards, or other pressed wood products, composite plastics, pressure-treated, or exotic hardwoods, and is the best option if you are looking for a beautiful, durable, and natural dimensional lumber.

Estimated delivery lead times are currently 3-5 weeks from date of order.  


100% Thermally Modified Ash Wood
Chemical-Free, Non-Toxic
FSC Certified

Specs & Details

Thermally Modified Dimensional Lumber
1"H x 2"W
1"H x 4"W
1"H x 6"W
1"H x 8"W
2"H x 2"W
2"H x 4"W
2"H x 6"W
2"H x 8"W
2"H x 10"W
2"H x 12"W

Boards average 12' in Length

Measuring instructions

Orders are placed in Linear Feet

To calculate order size in Linear Foot:

Linear Foot = (estimated square footage need) * (10% overage) * (scaling factor)

Scaling factor = 12" / (board Width)
Example - accent wall:
Rough Wall Dimensions: 22' x 9'
Using 1" x 8" boards

(22'x9') * (1.1) * (12" / 8") = 326.7 Linear Feet

Order 327 Linear Feet for this example
Pro Tip: estimated square footage should include all finish surfaces needing boards; possibly including walls, framing, hand and/or top rails, fascias, trims, millwork, etc.
Use your estimated square footage to add the appropriate amount of recommended mounting hardware as indicated in the installation manual.
If you need any help calculating the appropriate amount of material for your project, contact or call us and we'll be happy to help!

Shipping & Fulfillment

Current estimated delivery lead time is 3-5 weeks from date of order. Estimated delivery dates will be confirmed upon order confirmation with the factory and coordination with freight/carrier service.

See Go Green Home Supply Shipping & Returns Policy for more details on rates and process.


Finish: Arbor Wood Natrl Ash - no finish

Like traditional lumber, these dimensional boards from Arbor Wood have a natural raw finish from the factory, but due to the thermally modification process, the product tends provide a higher quality look and smoother wood texture.

Optional UV inhibitors or stains can be site finished/applied but are not necessary. See Care & Maintenance section below for more details.

Custom orders

Arbor Wood is capable of producing custom products for your special project!

Simply reach out to and we will happily facilitate any custom requests you have.

per Linear Foot
coffee station in an office
Thermally Modified Wood

Performance Driven, Eco-Conscious

Arbor Wood products are produced with responsibly sourced, domestic timber which undergoes a special thermal modification process using only heat and steam. This process changes the cellular structure of the wood making it a more stable, durable, and hydrophobic board resistant to rot and fungal decay.

The result is a healthy, long lasting, beautiful wood deck that is free from harsh chemicals or plastics.

100% natural. 100% biodegradable.


Ash - Raw

The thermal modification process enhances the wood's appearance, highlighting the deep, rich tones of each board. You may choose to apply a UV inhibitor which slows the patina process that occurs over time. Consistent application preserves the original character of the wood longer.

Natural Patina Over Time

Ash - Aged 6-12 Months

You have the choice to avoid additional coatings, paints, or stains altogether. In doing so, you will be making a more economical, eco-friendly, and healthy choice by avoiding chemicals entirely. There is also the benefit of reduced maintenance over the life of the product.


Ash - Fully Weathered

If you choose to leave the wood unfinished, Arbor Wood will move to a beautiful, natural gray over time, while still retaining its physical durability and stability. The color change is superficial and does not impact the longevity (or warranty) of the board product.

Decking, Siding, Trim & Millwork

Arbor Wood modified hardwoods are the eco-conscious alternative to exotic hardwoods, while softwood variants are the more natural and durable alternative to traditional chemically preserved lumber.

Arbor Wood produces a range of wood species, profiles, and finish options, including a beautiful take on traditional Japanese charred finish.

From window and door trim work, exterior landscape furnishings, even to interior accents and flooring, Arbor Wood is the most sustainable choice in dimensional lumber when looking for a high performance, natural product.

modern and dark kitchen design

Low Maintenance - High Quality

Arbor Wood thermally modified woods can be used without additional finishes and are expected to last 25+ years without any signs of serious physical degradation, warping, or buckling. You also have the option to use paints, stains, or other wood finishes with thermally modified wood to create whatever look/feel you desire.

Additional product information


Dimensional Lumber is suitable for a variety of interior and exterior applications.

Follow the same general installation practices you would as if you were using traditional lumber. Consult an skilled tradesman or product expert for project specific needs. As always - Go Green Home Supply is here to help too.

Reach out to us if you have specific installation questions pertaining to dimensional lumber.

Care & Maintenance

Arbor Wood Co. thermally modified wood can be used without additional finishes and expected to last 25+ years without any signs of serious physical degradation, warping or buckling.

However, a UV coating can be used if color retention is an important factor (Arbor Wood recommends CUTEK Extreme). If no UV coating is used, the wood will patina out to a natural silver.

Arbor Wood recommends CUTEK Extreme should be applied/reapplied if desired when the wood is no longer beading or as frequently as necessary to retain the natural or altered color of the wood. Timing will differ depending on many variables including the age and porosity of the wood, species, situation, design, aspect, weathered exposure and adequacy of preparation.

When considering frequency of maintenance there are two factors to consider:

Protection: CUTEK Extreme diffuses deeply into wood to provide long-term, cumulative, inside-out protection. Even when the wood surface has grayed and weathered, CUTEK Extreme will remain permanently mobile in the wood, meaning protection is not compromised even if the outward appearance of the wood has changed. Each additional coat of CUTEK Extreme provides further additional protection against moisture.

Appearance: To maintain the natural color of freshly oiled wood for longer or alter the appearance of your wood, CUTEK Extreme with an added CUTEK Colortone should be applied. Over time and with exposure to sunlight and UV, the color will slowly fade to a silver patina, or ware/erode with use. Color durability and the rate at which this fading, or wearing/eroding occurs is dependent on many factors, such as age and porosity of the wood, species, situation, design, aspect, and degree of exposure to the weather. CUTEK Extreme with an added Colortone should be reapplied as frequently as necessary to maintain desired color vibrancy.

Go Green Home Supply does not currently sell CUTEK products.

Recommended Refinishing Product (Cutek Extreme Penetrating Oil)


Arbor Wood products are covered by a Factory Prorated 20-Year Limited Warranty

Warranty Details