Mataverde Introduces Fire Retardant Treated Hem Fir Wood Siding

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The beauty of vertical grain thermally modified Western Hem Fir siding is undeniable. It closely matches the elegant, natural look of Western Red Cedar siding. The thermal modification process used to create thermally modified hemlock siding makes the finished product more consistent in color, more stable and highly durable. What could be better you ask?  Well, Mataverde Thermally Modified Western Hem Fir siding is now available as a fire retardant treated cladding.

Thermally Modified Hem-Fir siding and fencingMataverde Thermally Modified Hem Fir siding is available with fire retardant treatment


New Code requirements are driving the need for more fire resistant wood siding options

Many of the international building codes, including ICC (International Code Council), IRC and IBC, now require ever more stringent flame resistance performance. The basic difference in the new code rules is that an additional 20 minutes of flame resistance is required in some regions. And now these building codes are being enforced in more areas than ever, especially in WUI (Wildland Urban Interface) zones.

Mataverde ThermaWood FR (Flame Retardant Treated Hem Fir Siding) has been evaluated by the ICC to meet many of these new code requirements. Please refence the document below.

Because the new fire resistance code requirements are being adopted in more areas daily, always check the local requirements with the authority having jurisdiction in your area. State, county, and local building codes and building inspectors are a great resource and a very good place to start.

DOWNLOAD ICC-ES ESR-1159 WUI Evaluation Document for Mataverde Fire Retardant Treated wood

What are my fire retardant treated wood siding options?

Mataverde flame retardant treated thermally modified Hem Fir cladding is offered in several traditional siding profiles. 

In Stock Items

Mataverde ThermaWood FR Hem Fir Siding for West Coast clients (including Rocky Mountain states)

Currently available in our West Coast facility we stock Mataverde ThermaWood FR 1x6 T&G "Nickel Gap" Hem Fir Fire Retardant Treated Wood Siding:

1x6 TG Nickel Gap siding profile

The Mataverde ThermaWood FR Hem Fir 1x6 Tongue and Groove Nickel Gap siding profile is available in the following grades, 6' through 20' Random length tallies:

C+ Better Grade flat and mixed grain Hem Fir and

A+ Better Grade Hem Fir 85/15 Vertical Grain/Mixed Grain.


Thermally modified hem fir siding performs exceptionally well all by itself. The vacuum kiln pressurized process allows the wood to become more durable, more stable, and stronger at lower temperatures. And when you take the extra step of flame-retardant treating the Hem Fir siding, you add an extra layer of safety and flame resistance.

Thermally Modified Hem-Fir  siding on mountain home

Mataverde thermally modified Hem Fir fire retardant treated siding is available in many siding profiles

Mataverde flame retardant treated Hem Fir siding is installed and maintained in the same way as standard thermally modified Western Hemlock siding. Oil stains and paints are the preferred method if a finish is needed. This oil finish can be maintained periodically if desired, or the Hem Fir siding can be allowed to eventually weather to a silvery gray patina.



Looking for more information about Mataverde ThermaWood Hem Fir Siding? 


Thermally Modified Hem Fir Siding info

Thermally Modified Hem Fir Siding Photo Gallery

Compare Thermally Modified Hem Fir to Western Red Cedar

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