What Sustainable Building Can Learn from Treehouses
In response to the current malpractice of marketing almost everything as green I would like to propose an unusual remedy ā tree-houses. Specifically, I think the design and construction of āgreenā tree-houses produces a much needed refocusing on what we mean by sustainable.
I first made this observation several years ago when asked to help a fledgling organization called Forever Young Treehouses prototype their first wheelchair friendly treehouse. Forever Young was already barking up a tall tree in their attempts to make treehouses accessible to children with limited mobility, so when I suggested that the structures be made as green as possible, they were thrilled. Tilting at windmills is in their nature.
As usual, it all starts with choosing the building site.Ā Even the most insightful and careful green-LEED-architect eventually chooses a site. Sure, they first study the flora and fauna, map the wetlands, mediate erosion and coordinate with the climate, but in the end they still choose the building site. And if there are mitigating circumstances (like the clientās budget), they sometimes choose second or even third choices. But with a treehouse there can be no such waffling. Indeed, there can be no choosing, per se, at all. The tree-house architect must find their site. All the usual site considerations must be met by trees already growing on the property.Ā This can sometimes be a daunting or even impossible requirement. Immediately the bar for āgreenā is raised to a place where not building the project at all becomes a very reasonable option. I doubt thatās ever even considered with more typical building projects.
Once the tree(s) are selected they must then be protected. Unlike earthen sites, their roots and bark canāt be dug up and damaged with the promise of later repair. If mortally wounded, the very foundation of your treehouse becomes a liability, even though it may take a few years to finally fail. Instead, they are generally fed, irrigated and effectively protected from construction vehicles. I now use techniques I learned building treehouses as standard practice on my conventional projects.
Once the site is found and the tree-house design is roughed out, itās time to consider green materials and methods. While everyone knows that embodied energy should be at least part of the selection criteria, the concept is usually abridged to just ābuy locally.”Ā This isnāt bad but it gives little visceral understanding of what embodied energy really is. I find the concept really comes alive when one has to lug every piece of building material up a 20ā-35ā ladder.Ā When itās our energy thatās being embodied, we tend to keep it to a minimum.
This also helps with reducing waste. Carrying extra materials up a tree only to have 20% cut off or otherwise wasted is not a popular working method among treehouse builders. And when unavoidable scrap does result from trimming or fitting, treehouse builders tend to find a use for it rather than throwing it back to earth (or into the dumpster).
Any significant treehouse is going to cost enough to warrant ongoing maintenance in the future. Because they are difficult to scaffold, it makes sense to keep all major maintenance to an absolute minimum. Thus, both owners and builders of treehouses give much more attention to durability and life cycle calculations when selecting materials and methods. Because even a paint job becomes a major undertaking, the idea of seven generations of sustainability starts to look really appealing. And a 100-year roof seems like a minimum spec!
Even if the supporting vegetation werenāt a limiting factor, tree-houses tend to be small. In contrast to McMansion designers, tree-house architects instinctively hunt economy of space. Best of all, when clients decide they simply must have a slightly bigger house, treehouse designers have Mother Nature backing them up as they tell the client that itās just not in the cards. Without espousing altruistic design philosophy, treehouses remain compact for purely obvious reasons. And in doing so, they reap all the benefits green architects have long been advertising ā lower material costs, lower energy costs, smaller mechanicals, human scale and, above all, lighter environmental impact.
Ultimately itās the sum of our total environmental impact that is most illuminated by this undertaking. Designing and building a green tree-house could be the perfect talisman for our broadest sustainable goals. When we mindlessly design and carelessly build a treehouse, the odds of killing the trees become high. And when the trees die, all our efforts and everything weāve built in them will cease to exist. Isnāt that the perfect metaphor for our entire building situation? If we donāt build in a healthy, sustainable way, it is only a matter of time before we ākillā the natural environment that supports us. And when that happens, everything weāve created culturally, socially and commercially will cease to exist.
John Connell serves as Design Director at Connor Homes, a company specializing in the design and manufacture of early American-style homes, in a process Connor Homes refers to as āmill-built architectureā; allowing for the best of historical early American architecture, design aesthetic and details, coupled with the aforementioned benefits of factory built. Connor Homes – building the new old home since 1969. John Connell is also the Founder of the Yestermorrow Design/Build School in Warren, Vermont, Author of Homing Instinct (McGraw Hill) and The Inspired House (Taunton) and Principal of 2morrow Studio.
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