siding
$5.00 - $9.00 per square foot installed
Thermo Ash Siding: Thermally Modified Exterior Cladding
Thermally modified Ash siding offers enhanced rot resistance and a rich, consistent brown color through a chemical-free heat treatment process. Ideal for modern architectural cladding with environmental responsibility.
Why Choose This Species
Chemical-free modification. Enhanced rot resistance. Rich dark brown color. Improved dimensional stability. Eco-friendly process.
Available Sizes
1x6 cladding profiles; T&G; rain screen boards
Available Grades
Select, Standard
Installation Tips
Pre-drill all holes as modified wood can be brittle. Use hidden clip systems for clean appearance. Handle carefully.
Care & Maintenance
Apply UV oil to maintain color. Thermally modified wood grays slower than untreated wood but still benefits from UV protection.
Frequently Asked Questions
Yes, thermal modification significantly improves ash's rot resistance and stability, making it well-suited for exterior cladding applications.
Thermo Ash offers similar or better rot resistance than cedar with a more uniform appearance and darker color, at a higher price point.
Minor surface checking is normal. Pre-drilling and proper fastening minimize cracking. The wood is more brittle than untreated ash.