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Hewn’s Class A Ignition-Resistant Cedar Siding maintains the visual look and feel of our traditional exterior cedar siding, while implementing an industry-leading fire treatment process that modifies the wood to its core. These products resist the spread of fire, helping your project meet any major fire codes present in your area, and protecting your property in ways that were previously out of reach on a commercial scale.
In addition to their ignition resistant properties, our treatment process has the added benefit of slowing the aging process of the wood itself, protecting against ultraviolet degradation and extending the lifetime of the material.
Our ignition resistant products are subjected to industry-standard accelerated weathering tests (ASTM D-2898), Flame Spread (ASTM D-84), and are verified by International Code Counsel ESR-1159 and ESL-1021.
Custom Options
Hewn’s Class A Ignition-Resistant Cedar Siding can be customized to fit the individual needs and specifications of your particular project. Our finely skilled craftsmen can modify nearly any part of our in-house process to create a material designed according to your specifications, and our color technicians can match any shade or tone provided to us as part of our custom sampling process. Please contact a Hewn sales representative for more information.
Specifications
Wood Species
Western Red Cedar
Grade
Select Tight Knot
Standard Thickness
13/16″
Standard Widths (Nominal)
1×4, 1×6, 1×8, 1×10, 1×12
Milling Profile
Tongue & Groove or Shiplap (Multiple Options)
Moisture Content
Kiln Dried – Average 10-14%
Fire Resistance
Hewn Thermex-FR®
Process Type
Vacuum-Impregnated Treatment
Class Rating
Class A (ASTM E84)
Flame Spread Index
25 (or less)
V.O.C. Content
< 550 g/L
Smoke Developed Index
45 (or less)
Testing Information
QAI Laboratories
IAS Report No. AA-635
Treatment Notes
ICC ES Report ESR-1159 ESL 1021. Tested per ASTM E84 / UL 723. Extended for 30 min, no increase in listed classification subjected to standard rain test (ASTM D2898). KDAT.
Textures
- Brushed
- Rough ··
- Resawn ··
- Smooth Light Brushed *
- Smooth Brushed *
- Smooth Vertical Brushed *
- Smooth Heavy Brushed *
- Vertical Brushed †
- Double Brushed *
- Circle Sawn *
- Shipwreck ‴
* Custom Option
† Default on Peppercorn, Desert Sand, and Mushroom
‴ Specific to the Shipwreck finish
·· Available on Cinder, Hight Desert, Snow Fence, and Timberline