Accoya®

Hewn’s Accoya® products showcase one of the most advanced wood technologies available, made from sustainably sourced softwood that has been acetylated to achieve remarkable stability, durability, and resistance to the elements. Hewn enhances this innovative material with custom finishes, textures, and colors designed for both interior and exterior applications. The result is a timeless real-wood surface that combines the precision of modern science with the beauty of natural craftsmanship.

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Accoya certified wood logo

As the first company to produce acetylated wood on a commercial scale, Accoya® is leading the charge in providing durable and dimensionally stable wood for a variety of applications. In the acetylation process, softwood is essentially turned into a hardwood through the introduction of a non-toxic vinegar-like solution, creating a new type of wood that is durable all the way through the board, not just on the surface. In practice, this allows for a wood product that is significantly protected against the elements, making it perfect for installation in exterior environments where a standard sealed wood product would fail after only a short amount of time.

At Hewn, we build upon the extraordinary properties of Accoya® wood by applying our proprietary color and finish techniques to create beautiful, unique, and long-lasting wood products, suitable for a variety of applications, and customizable for the specific needs of your project.

Endless Versatility

The uniquely durable properties of Accoya®, created using an all-natural process, allow the wood to be utilized for a variety of purposes. Our sales representatives can customize your order to fit your precise needs and use-case scenarios.

Exterior Siding

Sealed for optimal protection against the elements

Interior Paneling

Durable enough for high-traffic commercial areas

Decking

Insect and rot resistance in a real-wood product

Accoya Project Gallery

Click below to view projects featuring Hewn’s Accoya.

Specifications

Dimensions

Standard 1× Widths:
1×6, 1×8

Standard 1× Thickness:
11/16″
(3/4″ custom)

Additional 1× and 2× options available upon request

Durability

Greater than 9 rating per AWPA E7

Moisture Content

3-5 % at 65% relative humidity, 20°C

Density and Spread

65% RH, 20°C, Average 32 pcf, Range 27 to 37 pcf

Fire Rating

Class C (ASTM E84) and D (EN14915)

Thermal Conductivity

ASTM C177, = 0.102 – 0.120 W/m∙K

Janka Hardness

ASTM E143, Tangential = 972 psi, End Grain = 1,484 psi

Certification

Approved by WDMA as compliant with WDMA I.S. 4. Certified as compliant with Cradle-To-Cradle with Platinum Level Material Health Certificate.

Textures

  • Brushed
  • Smooth Light Brushed *
  • Vertical Brushed †
  • Resawn *
  • Circle Sawn *
  • Crackle ^
  • Caviar ^
  • Shipwreck ‴

* Custom Option
† Default on Peppercorn, Desert Sand, and Mushroom
^ Specific to Shou Sugi Ban Options
‴ Specific to the Shipwreck finish

Standard Milling Profiles

Hewn’s Accoya Siding is available in a variety of milling profiles, designed to fit the individual needs of your project. Our most common 1× milling profiles, listed on this page, assume our standard thickness of 11/16″. Additional dimensions are available upon request.

Some milling profiles may be unavailable on certain finishes, including (but not limited to) our Heavy Char options. Please contact our sales representatives for additional information and alternative options.

T&G Milling Profiles

1x6 T&G Milling Profiles

T&G 1x6 Tight

T&G 1x6 1/16" Fineline

T&G 1x6 1/8" Fineline

T&G 1x6 3/16" Fineline

T&G 1x6 1/4" Fineline

1x8 T&G Milling Profiles

T&G 1x8 Tight

T&G 1x8 1/16" Fineline

T&G 1x8 1/8" Fineline

T&G 1x8 3/16" Fineline

T&G 1x8 1/4" Fineline

Shiplap Profiles

1x6 Shiplap Milling Profiles

Shiplap 1x6 Tight

Shiplap 1x6 1/16" Fineline

Shiplap 1x6 1/8" Fineline

Shiplap 1x6 3/16" Fineline

Shiplap 1x6 1/4" Fineline

1x8 Shiplap Milling Profiles

Shiplap 1x8 Tight

Shiplap 1x8 1/16" Fineline

Shiplap 1x8 1/8" Fineline

Shiplap 1x8 3/16" Fineline

Shiplap 1x8 1/4" Fineline

Acetylated wood, at-scale.

Acetylation has been studied and practiced in the wood industry for more than 70 years. The process, by which wood is effectively “pickled” in an all-natural vinegar-like substance, was once considered impossible to produce in large quantities. With Accoya®, however, these barriers have been eliminated, and this durable real-wood non-toxic product can be produced and purchased at-scale. 

And with Hewn’s expertise in coloring and finishing, Accoya® can be elevated to the next level, creating a timeless look and feel perfect for your next commercial or residential project.

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Nova hidden clip fastener for wood siding

Optional Custom Rainscreen

Hewn has partnered with Nova USA Wood to pair their industry-leading Rainscreen Siding ecosystem with our Hewn product offerings. Nova’s QuickClip Rainscreen Siding System is engineered by nature to withstand the test of time and the elements. Professional builders favor their products for their high quality, high performance and consistency.

Click here to learn more

Nova hidden clip fastener installation detail
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