Waterfront home in Massachusetts capitalizes on Cambia's resistance against humidity.

Uncoated Thermally Modified Cambia Wood Siding

Uncoated Thermally Modified Poplar siding adorns this magnificent regional visitors center in Wisconsin.

A Visitor's Center utilizes Cambia's uncoated wood siding.

The clear coating on the exterior of this East Boston restaurant shows off the beautiful brown tones of Cambia.

A restaurant with coated Thermally Modified Poplar.

This California credit union’s bold exterior is cladded in coated thermally-modified poplar siding.

Coated Thermally Modified Poplar.

This vertical, uncoated thermally modified poplar siding points to the apex of the visitors center’s impressive design and showcases the wood’s natural beauty.

Uncoated Thermally Modified Poplar.

Siding Description

Cambia by NFP offers our thermally modified poplar siding in two standard profiles: Shiplap and tongue and groove. Both are offered in nominal 1” x 6” and 1” x 8” sizes. ​Download our PDF to learn more about our siding products.

Siding Options


Ship Lap

4” Dimensions: 1 x 4. Actual 3/4 x 3.25. Exposed Face 2-3/4. Coverage .285
6" Dimensions: 1 x 6. Actual 3/4 x 5 1/4. Exposed Face 4.75. Coverage 0.39
8" Dimensions: 1 x 8. Actual 3/4 x 7 1/4. Exposed Face 6.75. Coverage 0.56


Tongue and Groove

4” Dimensions: 1 x 4 Actual 3/4 x 3.25. Exposed Face 2-13/16. Coverage .280
6" Dimensions: 1 x 6. Actual 3/4 x 5 1/4. Exposed Face 4.88. Coverage 0.40
8" Dimensions: 1 x 8. Actual 3/4 x 7 1/4. Exposed Face 6.88. Coverage 0.57


The Clip Profile

Our clip system eliminates face screwing. The screws go on top and the wood rests in a metal groove.
4” Dimensions: 1 x 4. Actual 3/4 x 3.25. Exposed Face 2-7/8. Coverage .275
6” Dimensions: 1 x 6. Actual 3/4 x 5-1/2. Exposed Face 5-1/8. Coverage .42


The Cambia Batten Clip supports the outer wall in a double-walled system.  This system creates a ventilated airspace between the framed inner wall and the finish rain screen wall. Proper overall design and construction techniques for this system are the builder’s responsibility.  In particular, the rain screen requires the following:
• Distance between studs cannot exceed 24” – Recommended spacing is 16”.
• Installation of structural sheathing, such as plywood or Oriented Strand Board (OSB) to the framed wall system.
• Application of asphalt-impregnated building paper or house wrap over the wall sheathing to create a moisture barrier and drainage plane.
• Suitable furring strips such as Spruce or Fir 1×3 or marine grade plywood ripped into 2 ½” strips.

*Furring strip systems increase convectional moisture removal

Convectional drying increases by dividing the airspace into vertical compartments (cavities or chimneys).  Convection current velocities generate slightly lower air pressure inside the chimneys than outside.  This pressure differential increases airflow through the system.  Researchers named this the “stacking effect” and have shown it an important mechanism to remove moisture from the system.

The airspace lacks chimneys in a non-furring strip system. The wall surface is one continuous airspace and the stacking effect is lost in non-furring systems.  The benefits are also lost, and these are considerable.

Installation & maintenance

Coated or Uncoated

Cambia siding can be left uncoated or coated with an oil or water based exterior preservative. When left uncoated, Cambia siding will turn a silvery grey over time much like aged, uncoated cedar.

Exterior Coating

If one chooses to use an exterior coating, we strongly suggest a water or oil based coating with UV protection designed to penetrate the wood. If coating the Cambia wood siding, regular maintenance should be expected in order to maintain the desired color. Generally, coatings should be reapplied every two to three years, depending on the level of sun exposure.

Recommended Coating Manufacturers

We recommend Woca products if you are looking for a supplier to treat Cambia’s siding products. They have various color options available including Walnut, Red Brown, Bangkiri and Teak. You can learn more about exterior oil on their website.


Crackless Screws™ are the recommended fastener for Cambia Thermally Modified products.

Learn more