When I first joined the team designing our new office, there was so much to do that I had no idea where to start. Being a literal sort of person, I decided to start from the ground up: the foundation.
Through this process, I learned some basics about concrete in general. Between mining the raw materials, transporting them, and kilning them, concrete has relatively high embodied energy. For each ton of concrete produced, approximately one ton of CO2 is released. Global demand for concrete is also colossal: 1.6 billion tons annually, with demand rising steadily as more and more countries incorporate concrete into industrial and residential construction.
Sorry for the long silence on SESE’s new headquarters but we’ve been so busy building it that we completely forgot to tell you all about it. We broke ground on the recycled warehouse and mostly erected it back in 2011 (post on that coming up soon) and then broke ground on the building proper in May of 2012. The months preceding ground breaking were a flurry of design sessions, draft drafting, research, and consultation. After laying a lot of the ground work ourselves we ended up working with architect Fred Oesch, an area green architect who came highly recommended from a number of people, to bring our plans to completion. He was a great help, advising us on design elements to aid in natural lighting and ventilation, building systems for high performance and low cost, and helping us figure out what we could do ourselves and how best to do it.
The final design is a beautiful sweeping two story affair oriented invitingly to the south (how could we build a building without a grand southern exposure?) and fitting cozily into the space we prepared for it. Take a look.
You can see quite a few features of the building on this drawing. The long face full of windows is the south and front side of the building, maximizing solar heat gain in the winter and letting lots of light into our working space. Our recycled warehouse is poking its nose into the picture from the right. You can see the sun porch and front airlock projecting out of the face of the building. The exterior grade doors leading from the porch to the outside and into the office proper will prevent outside and inside air mixing which should help keep us cool in the summer and warm in the winter. The mostly glass walled area should also make a cozy place to take off your snowy coat and boots or just pass the time in the winter.
From here you can also see the terraces providing outside access from the second floor, which is mostly private offices and flex room for our growing co-op to expand into (knock on wood!). The east and west terraces will be surfaced in an engineered soil and planted with sedums forming a living roof which should last indefinately and help keep our building cool in the summer by converting some solar energy into living energy rather than heat and by doing a bit of evaporative cooling to boot. Crowning the building you’ll notice the full length monitor (a sort of super cupola) that we’re including for lighting and ventilation. The windows all along this ridge will let a flood of light into the core of the second floor, naturally lighting what would otherwise be a dim northern side of the building. When we open them up in the heat of the summer, we’ll be setting up a powerful stack or chimney effect whereby hot air in the building will rise into the monitor and escape through the windows, pulling in relatively cooler air from the ground floor to replace it. When the days get hot enough that the stack effect stalls out we’ll be mounting a few whole building exhaust fans in the monitor to take up the slack. Out of our commitment to live lightly on the land we will not and have never air conditioned our people, although we do air condition our seeds. Ventilation, shading, and the timely opening and closing of windows can keep our spaces comfortable throughout some pretty challenging weather without the high energy cost associated with air conditioning.
Here you can see the layout of the first floor of the building with a few features I already mentioned. Here you can see how the southern wall (the bottom of the drawing) is peppered with windows while the northern wall opposite it is pierced very sparsely. This lets light (and heat during the winter) in on the south where it is abundant but keeps the cool dark northern wall as well insulated as possible. You’ll also notice that the rooms clustering around the northern wall are spaces not generally inhabited by people, like the mechanical room or the bathroom, or that we want to be cool and dark, like the picking room where all the packets of seed live. The principles for good seed storage are to keep the seeds cool, dry, and dark as what they want to start growing is warmth, wetness, and light. Situating the picking room along the north helps keep it cool and dim. To supplement this we will be super-insulating the walls of the room (including a straw bale wall along the whole northern exterior wall) and installing a good wrap around vapor barrier to keep our amble Virginia humidity out. These measures should minimize the amount that we need to run our air conditioner and dehumidifier to keep the room at its optimal condition.
The southern rooms are more self explanatory. The multi-purpose room is our big open space that we hope to use in a variety of ways. It should provide over flow space for working during the busy winter season, space to hold our regular meetings, and hopefully to hold occasional public workshops on seed starting, seed saving, cooking with heirlooms, gardening organically. The clean office, also called the quiet office, separates computer and phone workers from the dust and loud music from of the shippers and packers occupying the dirty office (also the noisy office).
Two little harder to spot details are the wood fired boiler and the composting toilet. We’ll heat this building, as we heat all our buildings, with wood harvested from our own land or purchased locally burned in a super high efficiency boiler. Wood is a great heating fuel, especially in rural areas, as it is relatively abundant, naturally renewable, and carbon neutral. Using a high efficiency gassification boiler and an intelligently designed heating system (which we got a lot of help with from Galen Staengl, a local green mechanical engineer) can get the fire running pretty cleanly and can get the most energy out of this still precious resource. The building also features a small basement vault where we will house Virginia’s first legal owner built vault composting toilet and the dosing basin for our grey water system, designed by John Hanson of Nutricycle Systems. Composting toilets are ecologically and economically wonderful waste management systems and, as we’re in a position to easily pull it off, we would have felt remiss not to include one.
Well, that concludes the preliminary tour of the new seed office. We hope to throw up a few more posts in the coming weeks to catch you all up to the current state of the construction. Stay tuned!
You couldn’t tell at a glance, but beneath a labyrinth of woody vines and bushes, piles of large structural steel units lay, slowly sinking into the earth. Here they slept in their coma of non-use, the occasional rodent family or insect colony the most prominent sign of life around them.
At one point in the history of Acorn, the intentional community that SESE calls home, previous members worked in demolition, with the perk of being able to take home any building materials that they wanted. During this time, they encountered some notable finds, namely enough steel columns, beams, girts, and purlins to comprise the major structural components of a steel building.
This was over a decade ago. Every so often, Acorn members would prod at the pile, rediscovering the find for themselves and entertaining grand notions of reassembling them into a useful structure. In one such instance, the urge to do so was particularly tenacious; with the unfurling plan to build SESE a seed office headquarters, an adjacent warehouse would further advance our long-term goal of centralizing all of SESE’s functions into one area. Prompted by this latent possibility, member Paul decided to ask a local steel building expert to look at the piles and advise us accordingly.
It was confirmed that we had enough trusses to put up a building, but that our components were a Frankensteinian compilation of two or three dissimilar buildings, and that at least some of the parts of the building had already been once salvaged and pieced together, further obscuring its configuration. We were advised that working with a salvaged building, especially if we were trying to do it ourselves, would likely be much more complicated and frustrating than we could foresee.
The cost of buying materials for a stick-frame barn was within our means, and it would be much easier to assemble. However, in line with our general values, the practice of just buying something new in the name of convenience, with the accompanying high embodied energy and heavy environmental impacts, made us cringe. We figured if anyone was in a situation that favored reusing resources at hand, it was us—we have both the values to compel us and the labor to make it happen. Although reusing salvaged materials such as giant steel beams is less of a trademark to the sustainable building movement than that of sinuous earthen structures or living roofs, we reasoned that insofar as sustainability is concerned, little can beat building with a pile of slowly rusting materials in your backyard.
Hence the challenge was born. Stay posted for details about the first step of the building process: the foundation.