Thermally Modified Ash 1×6 S4S E4E

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

 

Price range: $34.70 through $83.28

overview

Thermally modified Ash 1×6 boards are a durable, chemical-free option for exterior builds that need long-term performance. The heat and steam treatment stabilizes the wood, making it more moisture- and decay-resistant than untreated Ash while preserving its natural beauty. With a finished size of 7/8″ x 5.11″, these boards are ideal for decking, vertical cladding, fencing, soffits, and more. Their smooth S4S E4E profile installs easily and creates clean lines with minimal warping. The warm brown tone weathers gracefully over time or can be sealed to retain its original color. An additional random-length option is available in 7/8″ x 5.5″ for flexible layouts.

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

2023-03-23

Maria Daniela Marín

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.

2025-02-27

Rosa Figueroa

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!

2025-05-21

Lancelot Yupingkun

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!

2024-03-22

Craig Neil

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.

2024-04-18

Tony Nguyen

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.

2025-01-02

Raj Patel

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.