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Home » Home & Garden » Green Homebuilding » How Green Is Cordwood Building?

How Green Is Cordwood Building?

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cordwood_building.jpgCordwood building is an alternative building method that uses stacks of firewood held in place permanently with mortar to create walls.

Most people considering cordwood building are interested in its potential as a green building method.

But how green is cordwood building really?

The answer, like most questions pertaining to sustainability, depends on where you live and the techniques used when constructing your cordwood building.

 

Top Reasons For Cordwood House Construction

Embodied Energy

Cordwood building can have low embodied energy provided the wood used is local, or better yet, used from on site. Because the wood requires very little work before being used in cordwood walls, there is very little waste or energy consumed processing it. However, the inherent energy contained in the wood, combined with any distance that the wood must travel to the site, can increase the embodied energy significantly.

The embodied energy represented by the wood pales when compared to the energy intensive mortar that is often used. Portland cement is one of the most high-embodied- energy materials used in building construction. It also causes significant pollution when it is manufactured. Some of these concerns can be addressed by using a cob mortar or a Portland cement that has a significant amount of fly ash in it.

 

Energy Efficiency

The R-value of cordwood building walls can be excellent, depending on the thickness of the walls and the insulation being used. The thickness of cordwood building walls can be adjusted for your specific climate with relative ease. However, the wood often shrinks within the mortar, creating cracks that can significantly reduce the R-value of the wall. Therefore repairs to seal cracks must be made to retain the insulating factor of a cordwood building. To figure out the real world R-value of a wall, talk to cordwood building homeowners in your area.

 

Longevity

The longevity of cordwood buildings is a matter of dispute. Proponents say most wood shrinkage and rot can be avoided with carefully choosing well-seasoned wood and creating overhangs to protect the walls. Detractors claim that even with these considerations the wood in the walls often rots, shrinks, and can be severely damaged by insects. Both sides agree that some shrinkage of your cordwood walls will occur, so it is important to know how to address these problems as they appear.

Treating cordwood buildings to resist insects and rot is also a matter of debate. The most effective treatments are also the most environmentally unsound, but such treatments often extend the life of a cordwood building. More environmentally conscious builders are using plaster to protect the cordwood walls with mixed results.

 

Off Gassing

Cordwood building doesn’t require any material that would create any type of off gassing or air quality concerns. However, some homeowners who use the cordwood building technique use a sealant to further protect the wood. This can create off gassing depending on the type of sealant used.

 

Further considerations

Because cordwood building remains such a unique construction method it may be difficult to get an experienced builder to work on a project using cordwood, while a novice builder may not know how to avoid problems of shrinkage and rot.

If you do decide to use this construction method, be sure to research what common cordwood building problems are and how to avoid them.

 

RELATED:

Some of the Best Cordwood articles spanning the last 25 years (Great stuff here!)

 

Amy
Amy

I have a lot of hands-on experience in the home construction industry, with a good deal of experience in sustainable building. I’m mostly interested in home restoration and home renovations.

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Filed Under: Green Homebuilding, Home & Garden Tagged With: Green Building Materials

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RandyI started as a home-stalker... visiting brand new homes under construction in the neighborhoods near my house. That inspired me to write about home building and home renovation projects -- chronicling homes during different phases of construction from a consumer's point-of-view. Basically, the tips you'll find in my articles are a collection of checklists for what I think should (and should not) go into building or remodeling a quality home.

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LynnetteMy husband and I have been through the home building process... from scratch... more than once! (And we still have a few pieces of property that we might build on in the future.) So we definitely have some helpful tips to share when it comes to designing your dream home and building a house from the ground up. We've also learned that the 'fun' doesn't end once the house is built. Our clever home maintenance hacks will save you time and money each year that you live in the home. And... since everyone's house eventually needs a little remodeling (as has ours), we've got some ridiculously helpful home renovation tips as well! Whenever I’m not DIYing something around the house or adding to my Dream Home Wish List, you can find me at the corner of Good News & Fun Times as publisher of The Fun Times Guide (32 fun & helpful websites).

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