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Thermally Modified Ash

Thermally modified, FSC-certified Ash from Beyond Lumber offers bold grain, superior durability, and modern versatility—available in square, fluted, or T&G profiles. Great for siding, ceilings, fences, and high-humidity spaces.

$26.76$80.28

overview

With rich caramel tones and bold, expressive grain, thermally modified Ash from Beyond Lumber brings both beauty and performance to architectural projects. Treated through a chemical-free process using only heat and steam, this wood gains enhanced resistance to moisture, insects, and decay—making it significantly more durable than untreated hardwoods.

Ash’s excellent dimensional stability makes it a strong performer in moisture-prone areas like saunas, outdoor showers, or coastal facades. Its strength, smooth surface, and refined look make it an ideal material for siding, cladding, fences, soffits, and ceilings in both residential and commercial builds.

Beyond Lumber offers FSC-certified thermally modified Ash in a square-profile standard, with optional fluted and tongue-and-groove (T&G) milling available by request. Whether your project calls for clean lines or modern detail, Ash delivers a premium, low-maintenance solution with high-end visual appeal.

specifications

  • Zero-chemical treatment using only heat and steam
  • Dense hardwood with a bold, natural grain pattern
  • Deep chocolate brown color that develops a silver patina over time
  • Highly stable and resistant to moisture, rot, and insects
  • Ideal for exterior cladding, screens, and architectural features
  • Responsibly sourced from North American forests

Benefits

Weather-Resistant

Naturally stable and moisture-resistant for long-term outdoor performance.

Sustainably Sourced

Sourced from North American forests and modified with zero chemicals.

Design-Forward

Rich grain and deep brown tone create a bold, architectural finish.

material gallery

Maria Daniela Marín

2023-03-23

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.

Rosa Figueroa

2025-02-27

Such a great find! I needed my side gate upgraded and Ed Shubin was so helpful in getting me just the right piece of lumber. He knew exactly what was needed according to my specifications! The lumber was top notch and I couldn’t be happier. Thank you Ed!

Lancelot Yupingkun

2025-05-21

Roy and team have been amazing! We got high quality ipe and cumaru wood from them for our backyard fence and deck. The wood is just phenomenal. The team is also extremely professional – always responding to our questions, providing helpful tips, and finding ways to make our project work within budget and schedule. Highly, highly recommend!

Craig Neil

2024-03-22

The best place to get Brazilian hardwood that I\’ve found anywhere in California or online. The customer service is very good, the reps are attentive to you upon arrival and they are very knowledgeable. The quality of wood is superb and the pricing is cheaper than I can find anywhere else.

Tony Nguyen

2024-04-18

Absolutely the best place in socal for all of your tropical hardwood needs. Just built a small deck with 5/4 x 6 cumaru sourced from BL. Their prices can\’t be beat locally. The selection is also great. They have all the major hardwood species.

Raj Patel

2025-01-02

Had a great experience with George 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. (I sealed it with Cutek Extreme so hopefully that prolongs the lifespan). Thank you George!! Everyone has told us how much they really like the cladding used for our media wall and we appreciate your help with our project.