Thermally modified ash wood – perfect for outdoor decking, siding, and architectural facades
Thermally modified ash decking installation – modern design with long-lasting performance
Thermally modified ash boards – durable, chemical-free wood for outdoor spaces
Premium thermally modified ash wood used for decking and cladding applications
Exterior wall finished with thermally modified ash siding – elegant and eco-friendly design

1 x 6 Thermowood Ash End Match

STARTING AT: $6.00

A stable, rot-resistant Ash board thermally modified for outdoor use. Great for decks, cladding, and fences in modern or natural builds

Ships nationwide with no minimum order.
Most in-stock items ship next-day from our Los Angeles facility.

For the installation

Overview

Thermally modified Ash 1×6 boards are a highly durable, chemical-free option for exterior projects. They require long-lasting performance. These boards undergo a heat and steam treatment that stabilizes the wood. This makes it far more resistant to moisture, decay, and warping than untreated Ash. At the same time, this process preserves the wood’s natural beauty. It gives your projects a warm, inviting look without the need for harsh chemicals.

The finished size of 7/8″ x 5.11″ makes these boards ideal for a wide range of applications. They are especially well-suited for:

  • Decking, providing a sturdy, attractive surface that holds up in all weather conditions, and features thermally modified Ash materials.

  • Vertical cladding, adding a stylish and durable exterior layer to homes or buildings

  • Fencing, offering a long-lasting solution that resists rot and insect damage and uses modified Ash wood thermally for extra durability.

  • Soffits and trim work, giving a clean, finished appearance while maintaining structural integrity

These boards feature a smooth S4S E4E profile, which allows for easy installation and creates clean, precise lines. Their consistency in shape helps reduce installation time and minimizes the risk of warping, giving your project a professional, polished look.

The natural warm brown tone of thermally modified Ash boards develops a soft, elegant patina over time. If you prefer, you can apply a sealant to maintain the original color and enhance the wood’s durability even further. For projects that require flexibility, a random-length option measuring 7/8″ x 5.5″ is also available, making it easier to plan layouts with minimal waste.

Whether you’re building a deck, fence, or decorative cladding, thermally modified Ash 1×6 boards combine beauty, strength, and sustainability. They offer a long-term solution that performs exceptionally well in outdoor environments. The use of this type of Ash ensures a natural, classic appearance that complements any architectural style. Ash Siding 

Specifications

  • Dimensions: 7/8 inch by 5.11 inches
  • Lengths available: 5 feet to 12 feet
  • Profile: S4S E4E (surfaced four sides, eased four edges)
  • Thermally modified for increased stability and moisture resistance
  • Kiln-dried and ready for install
  • Naturally resists rot and insects after treatment
  • Medium brown tone with subtle grain patterns
  • Ideal for decking, siding, fencing, soffits, and outdoor ceilings
  • Can be sealed to preserve color or left unfinished to silver over time

Benefits

WEATHER-RESISTANT

Thermal modification makes it highly resistant to moisture and decay.

EASY TO INSTALL

Boards are stable and uniform, making installs smooth and fast.

DESIGN FRIENDLY

Clean grain and warm tone fit both modern and rustic styles.

SUSTAINABLY SOURCED

Modified without chemicals and responsibly harvested.

Material gallery

Had a great experience with the sales rep. He was very knowledgeable and honest. We ended up buying some thermally modified ayous panels for an outdoor media wall. So far so good. It looks great and hopefully will last for decades… Thank you!! Everyone has told us how much they really like the cladding used for our media wall and we appreciate your help with our project.

Best prices and quality I found after looking at a few different places for lumber for my deck project. Customer service was excellent and they helped me with my selections, staff was very knowledgeable! Highly recommend Beyond Lumber and they will be my go to place for future projects.

Roy and his team are hard to beat. These guys are great, I’m a deck builder myself and their customer services is on point. Thanks for all your help team!

We had an excellent experience with Beyond Lumber. Their team was knowledgeable, professional, and guided us through every step of choosing the right materials. The quality of the IPE and other hardwoods was outstanding—everything arrived on time and exactly as promised. Beyond Lumber truly cares about customer service and delivers top-notch products. Highly recommend them for anyone looking for premium decking and outdoor materials

I started buying IPE from Brazilian Lumber over one year ago before the vendor opened the California location (i.e. where I am located). There were some issues related to the lumber (IPE), BUT the vendor made sure that all was taken care of and that I was happy. I mentioned “the issues” not to say that they product is bad, but rather to stressed out that the vendor provides superb service. No matter what you do, the problems may happen. Important is how such situations are handled. I was working with Luis, great guy to work with. I recommend this vendor.

I upgraded my backyard with Ipe deck tiles for my patio. It was definitely an investment, but it’s turned out to be worth every penny. The tiles were easy to install and the finished product is not only beautiful, but also incredibly durable and functional. I would highly recommend Ipe deck tiles to anyone looking to create a beautiful and long-lasting outdoor space.