Green Building Materials
At Mason’s Mill & Lumber Co., green building materials aren’t a side category — they’re a core part of how we help architects, builders, designers, and homeowners spec real wood and wood-alternative products that hold up outdoors, indoors, and everywhere in between. Our green catalog includes FSC®-certified sustainably sourced lumber, modified wood from Accoya®, Kebony®, and Thermory®. Every product is chosen for the same reason: it lasts, it’s honest about how it’s made, and it lets you build responsibly without giving up performance or looks.
What Counts as a "Green" Building Material?
A green building material is one that reduces environmental impact across its full life — how it’s harvested or manufactured, how long it performs, and what happens to it at end of life. The products on this page qualify in one or more of these ways:
Sustainably sourced. FSC®-certified or grown in well-managed forests where new trees replace what’s cut.
Chemically clean. Free from phenol, formaldehyde, and harmful VOCs — safe for interior and exterior use.
Modified for longevity. Thermal or bio-based modification extends service life to 25–50 years, so boards are replaced less often.
Tree-free or upcycled. Products like ACRE™ are made from agricultural byproducts that would otherwise be discarded.
LEED and Living Building Challenge eligible. FSC®-certified wood contributes to green building rating systems including LEED v4.1, LEED v5, and BREEAM.
If you’re speccing to hit a sustainability target — a LEED credit, a client mandate, or your own build standard — we can help you match the right material to the requirement.
Browse Our Green Building Materials
This Accoya® Grey 1 x 6 with four eased edges can be milled into rainscreen cladding, tongue and groove or shiplap. Guaranteed for 50 years above ground. With Accoya® no additional oil or finish is required.
Learn more about Accoya® wood HERE: https://youtu.be/c3km0dYmr74
CLICK HERE TO ORDER A $10.00 SAMPLE in your choice of species that will be credited towards your full order.
Guaranteed for 50 years above ground and 25 years in ground or freshwater. With Accoya® Decking, no additional oil or finish is required.
Learn more about Accoya® wood HERE: https://youtu.be/c3km0dYmr74
CLICK HERE TO ORDER A $10.00 SAMPLE in your choice of species that will be credited towards your full order.
The Accoya® name stands for ULTRA-HIGH PERFORMANCE SUSTAINABLE WOOD, tried and tested in the US. Accoya® comes in many sizes for many applications and is guaranteed for 50 years above ground and 25 years in ground or freshwater. Accoya® wood is also sustainably harvested in accordance with the Forest Stewardship Council (FSC®). These Accoya® rough lumber products are 70% FSC®.
Accoya® brings unprecedented reliability for thermally modified wood. It is checked and trusted to not visibly swell, shrink or distort, with minimal movement. This modified wood is highly durable and stable and it withstands the test of any climate, so it is ideal for tough applications
Learn more about Accoya® wood HERE: https://youtu.be/c3km0dYmr74
CLICK HERE TO ORDER A $10.00 SAMPLE in your choice of species that will be credited towards your full order.
The Accoya® name stands for ULTRA-HIGH PERFORMANCE SUSTAINABLE WOOD, tried and tested in the US. Accoya® comes in many sizes for many applications and is guaranteed for 50 years above ground and 25 years in ground or freshwater. Accoya® wood is also sustainably harvested in accordance with the Forest Stewardship Council (FSC®). These Accoya® rough lumber products are 70% FSC®.
Accoya® brings unprecedented reliability for thermally modified wood. It is checked and trusted to not visibly swell, shrink or distort, with minimal movement. This modified wood is highly durable and stable and it withstands the test of any climate, so it is ideal for tough applications.
Learn more about Accoya® wood HERE: https://youtu.be/c3km0dYmr74
CLICK HERE TO ORDER A $10.00 SAMPLE in your choice of species that will be credited towards your full order.
Guaranteed for 50 years above ground and 25 years in ground or freshwater. With Accoya® Decking, no additional oil or finish is required.
Learn more about Accoya® wood HERE: https://youtu.be/c3km0dYmr74
Guaranteed for 50 years above ground and 25 years. Learn more about Accoya® HERE: https://youtu.be/c3km0dYmr74
ACRE™ recycled rice hull/pvc composite is made 100% in America (Mississippi) does not rot, is water resistant and has an extremely long life and can be stained or painted. ACRE™ can be used interior or exterior and is safe and non-toxic.
Not only is ACRE™ a sustainable, low-maintenance alternative to wood, it’s also a pleasure to work with on the jobsite. It’s lightweight and easy to carry, yet every piece is strong, rigid and straight. ACRE™ is also easy to cut with ordinary woodworking tools—with no special equipment, training or experience—and waste is minimal. And it takes paint, stain and lacquer just like real wood. Once your project is complete, you can be confident ACRE™ will stand up to water, weather, fire, pests and UV for years to come, backed by an industry-leading materials guarantee.
We are stocking both ACRE™ dimensional boards in various sizes. The boards are reversible with one smooth side and one embossed wood grain side.
ACRE™ Decking is a sustainable, durable alternative with the genuine look and feel of real wood. ACRE™ Decking is lightweight, strong, water-resistant and guaranteed not to rot or splinter. ACRE™ Decking is easy to cut, fasten without pre-drilling, rout, thermoform and accepts paint or stain without primer. Best of all, ACRE™ Decking is made without harming a single tree, in a zero-waste environment in the U.S.A. ACRE™ Decking helps protect your home and our world.
ACRE™ Decking is reversible with grain on one side and embossed on other side and available in grooved or no groove. See additional images.
ACRE™ recycled rice hull/pvc composite is made 100% in America (Mississippi) does not rot, is water resistant and has an extremely long life and can be stained or painted. ACRE™ can be used interior or exterior and is safe and non-toxic.
ACRE™ sheets are the perfect medium for executing your ideas. This revolutionary material offers the look and feel of wood, and it can be cut, curved, shaped and molded to fit countless applications, both exterior and interior. It’s also easy to care for and guaranteed to last. ACRE™ is made from upcycled rice hulls, making it a sustainable choice that doesn’t sacrifice performance.
We are stocking ACRE™ panels in 4' x 8'/10' sheets.
ACRE™ recycled rice hull/PVC composite is made 100% in America (Mississippi) does not rot, is water resistant and has an extremely long life and can be stained or painted. ACRE™ can be used interior or exterior and is safe and non-toxic.
Not only is ACRE™ a sustainable, low-maintenance alternative to wood, it’s also a pleasure to work with on the jobsite. It’s lightweight and easy to carry, yet every piece is strong, rigid and straight. ACRE™ is also easy to cut with ordinary woodworking tools—with no special equipment, training or experience—and waste is minimal. And it takes paint, stain and lacquer just like real wood. Once your project is complete, you can be confident ACRE™ will stand up to water, weather, fire, pests and UV for years to come, backed by an industry-leading materials guarantee.
Kebony® Fastenator™ Hidden Fastener clips secure your deck without screwing into the board’s face. Our Kebony® deck boards are compatible with the Fastenator™ Hidden Fastening system.
HIGHLIGHTS
- Automatic deck board spacing
- Works great for diagonal and herringbone deck patterns
- Ideal for resurfacing and/or out of square framing
- Stainless steel screws are pre-loaded in clip for quick and easy fastening
For Kebony® decking, the Kebony PRS System automatically creates an air gap of either 3/4” (high-profile clip) or 3/8” (low-profile clip). Be sure to choose the correct clip profile for your project.
The PRS clips should be installed directly to the studs over a suitable house underlayment or drainage wrap. Studs should be placed no more than 24” on center.
Learn more about the Kebony Clip System HERE: https://us.kebony.com/wp-content/uploads/2020/06/Product-Datasheet-KPRS1X6-1.pdf
Kebony® comes in many sizes for many applications. This Kebony® rough Lumber is also sustainably harvested in accordance with the Forest Stewardship Council (FSC®) and are a 70% FSC® mix.
This Kebony® rough lumber has tremendous versatility compared to tropical hardwoods. Not only is it FSC®-Certified wood that's easy to work with, it is dimensionally stable.
Learn more about Kebony® wood products HERE: https://www.youtube.com/watch?v=wUFl6ClB-WU
CLICK HERE TO ORDER A $10.00 SAMPLE in your choice of species that will be credited towards your full order.
Kebony® is modified wood sourced from FSC®-Certified forests and made to last using a patented and proprietary modification process called furfurylation. Furfurylation uses a bio based liquid called furfuryl alcohol derived from agricultural plant waste.
The Kebony Step-Clip™ system uses easy to install strips along with Kebony deck boards to minimize time and labor spent surfacing decks. This innovative hidden fastener system places the focus on the beauty of your Kebony and ease of decking installation.
Learn more about Kebony STEP-CLIP Decking HERE: https://us.kebony.com/wp-content/uploads/2020/03/Kebony-Step-Clip-Install-Guide.pdf
These Kebony Step-Clip™ Strips with nails make fast work of installing Kebony decking. Learn how to install the Kebony Step-Clip™ System HERE: https://us.kebony.com/wp-content/uploads/2020/03/Kebony-Step-Clip-Install-Guide.pdf
Available for Thermory® Ash and Thermory® Pine wood species, the Pro Plug™ System transforms a once time consuming and difficult task of installing plugs and fasteners into something simple and easy. Precisely engineered for installing wood plugs into decks, flooring, and woodworking.
Learn more about the Pro Plug™ System HERE: http://www.starbornindustries.com/pro-plug
Our Green Product Lines
Mason’s Mill stocks the three leading names in modified wood — Accoya®, Kebony®, and Thermory® — each engineered to outlast traditional lumber without the chemicals of pressure-treated pine or the environmental cost of tropical hardwoods. Accoya® starts with fast-growing, FSC®-certified Radiata Pine and puts it through a non-toxic acetylation process that permanently changes the wood at the cell level, delivering a Class 1 durable board backed by a 50-year above-ground warranty (25 years in ground or freshwater) — ideal for cladding, decking, siding, windows, and doors. Kebony® permanently modifies sustainably sourced softwood using furfuryl alcohol, a bio-based liquid made from agricultural crop waste, producing boards with the hardness and stability of tropical hardwoods and a 30-year warranty on Character and Clear grades. Thermory® uses only heat and steam — no chemicals — to reduce moisture and rearrange the cell structure, yielding boards 7x less likely to move than untreated wood; Mason’s Mill operates the Thermory USA Central Warehouse in Houston and holds the largest Thermory® inventory in the country across decking, cladding, siding, flooring, slatwall, and rough lumber.
Beyond these three brands, Mason’s Mill sources FSC®-certified rough lumber and millwork across a range of species for custom milling, moulding, cabinetry, and specialty projects. FSC® Chain-of-Custody tracks every board from forest to job site, giving architects and builders the documentation they need for LEED, BREEAM, and Living Building Challenge submissions.
Why Green Building Materials Matter
Green materials aren’t just a marketing angle anymore — they’re a spec requirement on a growing share of commercial and residential projects. Reasons architects, builders, and owners are choosing sustainable materials right now:
LEED v5 MRc4 now uses a Multi-Attribute Scoring methodology that ranks FSC®-certified building products the highest of any wood certification.
BREEAM 2018 and LEED v4.1 both reward third-party-verified EPDs, LCAs, and FSC® Chain-of-Custody documentation.
Modified wood products cut lifecycle impact because boards last 2–3x longer than untreated softwood — fewer replacements, less waste, less carbon over the life of the building.
Tree-free composites like ACRE™ divert agricultural waste from landfills and remove tropical hardwood pressure from the supply chain.
Chemical-free processes (thermal modification, acetylation, furfurylation) produce boards that are safe to handle, non-toxic to install, and safe to dispose of.
For homeowners, the payoff is a home that holds its finish for decades with minimal upkeep. For architects and builders, it’s a documented, defensible path to hitting sustainability targets on the drawing.
Frequently Asked Questions
It depends on the project. Accoya® has the longest above-ground warranty (50 years) and starts with FSC®-certified Radiata Pine. Kebony® uses bio-based furfuryl alcohol derived from agricultural crop waste. Thermory® is completely chemical-free, modified using only heat and steam. All three are strong sustainable choices — we're happy to help you pick the right one based on species, application, budget, and the look you're after.
Modified wood is real wood that has been permanently altered — either chemically (Accoya®, Kebony®) or thermally (Thermory®) — to resist rot, warping, and insects without the toxic preservatives found in pressure-treated lumber. It's considered a green building material because it starts with sustainably sourced or FSC®-certified species, uses non-toxic processes, and lasts 2–3x longer than untreated softwood — meaning fewer replacements, less waste, and a lower lifetime carbon footprint.
No. Pressure-treated lumber uses chemical preservatives forced into the wood under pressure. Thermally modified wood — like Thermory® — uses only heat and steam, with no chemicals added. The process reduces moisture to near zero and rearranges the wood's cell structure so it naturally resists rot, warping, and insects. Safer to handle, safer to install, and safer to dispose of at end of life.
Yes. FSC®-certified wood contributes to LEED v4.1 and LEED v5 credits — including the new MRc4 Multi-Attribute Scoring in v5, where FSC® ranks the highest of any wood certification. Modified wood from Accoya®, Kebony®, and Thermory® with published EPDs also contributes to LEED and BREEAM credits, as well as Living Building Challenge submissions. Ask us for the current documentation on any product you're speccing.
Accoya® carries a 50-year warranty above ground and 25 years in ground or freshwater. Kebony® carries a 30-year warranty on Character and Clear grades. Thermory® decking and cladding carry a 25+ year rot-resistance warranty. In real-world use, service life often exceeds the warranty period — especially on properly detailed exterior installations.
All three are modified wood, but the process is different. Accoya® uses acetylation — a non-toxic chemical process — on FSC®-certified Radiata Pine, delivering the longest warranty and best dimensional stability. Kebony® uses furfurylation — a bio-based process using agricultural waste — on sustainably sourced softwood to mimic the hardness of tropical hardwoods. Thermory® uses only heat and steam — no chemicals at all — on species like Ash, Pine, and Spruce. Different processes, different price points, different aesthetics — all excellent green options.
Yes. Nearly every product on this page has a $10 sample available through our Sample Shop, and the sample cost is credited back on your full order. It's the easiest way to see, touch, and finish-test the material before you spec it.
Yes. Accoya®, Kebony®, and Thermory® are all non-toxic and safe for indoor applications. Thermory® is a popular choice for interior flooring, slatwall, and biophilic-design feature walls. Accoya® is used for windows, doors, and interior millwork. Kebony® is used for flooring and interior cladding. None off-gas harmful VOCs.