Accoya Siding

Premium accoya siding boards for residential and commercial projects

Janka

1,100 lbf

Density

32 lbs/ft³

Fire Rating

Class B

Durability

50+ years

Origin

New Zealand pine

Color

Light tan (paintable)

Overview

Accoya siding represents the cutting edge of wood technology. Through a non-toxic acetylation process, sustainably sourced radiata pine is modified at the molecular level to deliver Class 1 durability (equivalent to the best tropical hardwoods), exceptional dimensional stability, and a projected 50+ year above-ground lifespan. Accoya is the most dimensionally stable wood siding available — it shrinks and swells up to 75% less than other woods, which means paint and coatings last significantly longer. Perfect for architects and builders who demand the best performance.

Learn more about this wood species on our Accoya wood guide.

Benefits of Accoya Siding

Class 1 durability — equivalent to the best tropical hardwoods

50+ year projected above-ground lifespan

75% less shrinking and swelling than untreated wood

Non-toxic modification process (no chemicals leaching)

Paint and coatings last 2-3x longer due to stability

Naturally resistant to rot, decay, and insects

FSC certified — sustainably sourced

Excellent for precision architectural applications

Sizes Available

1x6 Bevel Siding

1x8 Bevel Siding

1x6 Shiplap

1x6 T&G Siding

1x6 Channel Siding

Custom profiles from certified fabricators

Custom sizes and lengths available. Request a custom quote.

Installation Tips

Use stainless steel fasteners — Accoya is compatible with all standard fastener types.

Standard woodworking tools work perfectly — no special tooling needed.

Can be installed with minimal expansion gaps due to exceptional stability.

Prime and paint with standard exterior coatings for maximum longevity.

Install over house wrap and furring strips per standard siding practice.

Accoya can be glued with standard wood adhesives.

Maintenance

Accoya siding with a quality paint or stain system requires recoating every 8-12 years — 2-3x longer than other wood sidings — thanks to its exceptional dimensional stability. The wood does not shrink and swell enough to crack coatings. If left unpainted, Accoya weathers to silver-gray while maintaining its structural integrity indefinitely. Simply the lowest-maintenance real wood siding available.