Convergence

Zach Horton

Tag: eco-house

Domes 2022 Update: Infrastructure

It’s been awhile since I’ve updated this site (which I blame on the coronavirus blues), but it’s time to kick off a series of updates! I started this site years ago and named it Convergence because I intended it to be an unholy attempt to mix together different strands of my work and life that I wanted to bring together, experimentally, in the hopes that new connections, directions, insights, and dreams might emerge at the intersections. In 2022 I feel particularly invigorated to further explore this project. Plus, I know that many of you are interested in updates! So here goes…

The Domes project has been most consistently presented on this site because it represents, for me, a deep convergence of a number of my loves, including ecology, scale, family, form, dwelling, energy, systems thinking, and creativity. Let’s start out, then, with a short video of drone footage taken in January by Jon Watts. This is a candid snapshot of progress on the site that I’ll describe below:

In the past couple of years the Domes project has entered an exciting final phase. We completed the interior in 2020 and I began to focus on getting all of its interconnected systems up and running, as well as applying all I’ve learned in the previous five years to re-design some of its infrastructure. This lead to the design of a third structure, an above-ground utility hub and garage. We decided to locate this behind the domes proper, where we could dig up and re-configure our primary electrical and hydronic runs to better integrate the various components of the project’s infrastructure. I wanted to eliminate lingering underground water pressure issues that caused water to find its way into the domes (which are, after all, under ground) during heavy rains. These were issues that no one predicted before the build, and it is in fact counter-intuitive that sealed conduits would become flowing water pipes during heavy rains. But that’s exactly what happened (and in fact always happens in all conduits). Above-ground buildings are rarely affected by this because there isn’t enough water pressure in the underground conduits to push water high enough to empty into the structures. Plus, urban infrastructure has shorter runs and thus less of an opportunity to build up hydrostatic pressure. In the domes, however, long underground conduits and high hydrostatic pressure after rains easily push water up through conduits.

The opportunity to build a utility hub as a separate building allowed me to de-couple the domes from these long utility runs, eliminating the problem and creating an access point for new utility tie-ins, such as firefighting equipment, rainwater cachement, and off-grid battery banks. When digging new utility trenches, I also installed a deep “sump well” in the hillside that allows us to actually see far underground (visually or via sensors) to gather data about conditions underground. Here our friend Neal is helping me install the well:

The new building has a radiant floor that will be connected to a “heat dump” loop of our primary solar thermal heating system. This will transform its foundation into a massive heat sink to automatically handle excess thermal energy generated by the system. It can also be used, however, to provide on-demand thermal energy to the new building if/when desired. The electronic and hydronic interconnections between the domes, this new hub, and our outdoor utilities kiosk are extensive, and go far beyond the usual connections between detached buildings. This is because I’ve designed the entire site to be a single cybernetic system embedded in its natural surroundings rather than the autonomous islands that standard buildings are designed to be. Rather than the standard model of delivering utilities to autonomous buildings, here information, water, heat, and power are all shared in a multi-directional network.

I designed the foundation of the new utility hub with the necessary infrastructure, including underground plumbing and a large hexagonal pad, for a 5,000 gallon water tank. The roof is designed to collect rainwater and store it in the tank, then draw on that water for firefighting and emergency water needs. This new addition to our hydronic system is also designed to accept the input of other sources of water, such as a potential second well, in the future.

Beyond its main functionality as a utility hub, the new building will also serve as a garage so that we’ll be able to permanently house a vehicle on-site. And finally we’ll have a place to store our ladders! When the center of your ceiling is 15 feet high, changing lightbulbs can be quite a challenge! The building will also serve as a mini workshop to help keep the domes themselves less cluttered.

We considered a number of different building materials, and ultimately decided on steel as the most viable choice. We immediately ruled out wood as entirely inappropriate for the land’s fire ecology. Cinderblock or other masonry was both expensive and too monolithic, aesthetically, for our purposes. Metal is fireproof and economical; we hope we will be happy with the choice!

The pandemic has caused massive global shortages of steel, and the fabrication of our building has been delayed. However, we decided to move ahead with our foundation and are incredibly happy with how it turned out! And now all of our underground water problems have been fixed!

After we switched on our initial solar thermal system in late 2020 we were amazed: whenever there was sun it generated nearly unlimited thermal energy and used only only 60 watts (the amount of an old incandescent light bulb) of electricity to power a small pump. Compare this to the enormous amount of electricity it takes to heat up water (which is our backup system for long period of no sun). Even though we harness a great deal of electricity from the sun via the solar PV array I built in 2017, our solar thermal array feels far more magical. We decided pretty quickly to upgrade it with a second array of thermal collectors. My sister, Jess, and mom, Ann, and our friend Yves dug the forms for the new array on top of the second dome last year, and we poured them with the foundation. I then assembled the array with our friend Michael. Unfortunately, a sensor failure prevented me from bringing the full solar thermal system back online. When I next visit the site and have time, I’ll get it all running again, and our solar thermal capacity should be double. That’s a big deal, as this thermal system supplies heat to the domes (via radiant flooring), generates all of our hot water, and will, as I mentioned, be able to pipe excess heat to the new building.

We’ve also worked quite a bit on the interior of the domes, doing finish electrical, furnishing, and begun staying there. Those details will be covered in a future post!

We’ve also begun to turn our attention to landscaping. Two years ago we began to put temporary cages around new oak tree sprouts to protect them from grazing deer. Many have survived, but growing into a large tree is a long process! Meanwhile, Jess has been collecting stones from the land and has been experimenting with some masonry to help transition the front of the domes smoothly into the natural grasses of the land (which we hope to mow/cut far less in the future). She has also worked laboriously to create a paving stone pathway from the front patio to the kiosk and new garage in the back:

Next steps include further landscaping, connecting the many sensors and actuators in the domes together into the master “brain” that will allow the buildings to sense and respond to their environment, and of course, building the utility garage. As always, we welcome anyone who wants to join us on the land, especially this coming summer!

Raising the Bones: A Dome Building Update

R31edit (1280x853)

Building these domes- like building anything- involves constant coordination and creative problem solving. Every material (and human laborer) has unique properties that bend, fit, or revolt before our efforts. For example, how do we raise 18 200-lb curved steel beams that kick like stubborn mules to the 17-foot apex of the domes and bolt them in to form the basic support for our structure?  (The answer: Zach learned to drive an articulated boom, we invented a pulley system using an ancient rope from my dad’s shed, and four sets of muscles guided each into place.)  When physics,  respect, and careful oversight converge, our project slowly grows skyward. At this stage, we have built front walls out of insulated concrete forms (“ICF block”), filled them with a concrete core, created a massive rebar mesh surrounding the steel beams that has become the skeleton of our domes, and begun to lay electrical circuits.

Each friend-visitor to our site has shaped this process in distinct ways. Bryan, a traveling nurse and filmmaker, transformed ladders into stilts and danced at the top of our domes. Dan, an artist based in Washington, D.C. who is accustomed to working with diverse materials (he once made a giant Cheeto out of insulating expansion foam), is a rebar whisperer- everything he touches seems to move into place. Jenevive brought an art historian’s visualization skills to the construction site, Jeremy the sure hands of a surgeon, Alex a model of quiet persistence, etc.  The extraordinary progress you see below was not possible without the sweat and generosity of our friends and family.

Raising the beams:

R3 (1024x683)The beam team; Zach on boom

R38editLaying in the first pieces of horizontal rebar after locking in the beams

Rebar, endless rebar, every intersection tied twice:

R7 (853x1280)Zach placing the first layer of rebar

R6 (1024x683)Bryan testing the curvature

R9 (1280x853)Jenevive

R40editIMG_9778Jenevive and Jess, filthy and satisfied

R10 (1280x853)The mesh grows with the help of Jeremy and Gabe.

R39editMegan’s hat, caught in a rebar shadow web

R12 (1280x853)Zach cutting rebar

R11 (1280x853)Jeremy holding rebar for Zach to cut

R21 (1280x853)Alex tying rebar at the apex of the monkey gym

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R4edit (1024x694)Job boss!

Building the front walls out of insulated concrete forms (“ICF block”):

R20edit (1280x853)Jess and Zach, pausing to admire the view through the picture window frames in Dome 1

R25 (1280x853)The wall for the bedroom and office, Dome 2

R23 (1280x853)

R33edit (1280x853)Each individual ICF block has plastic webbing inside 2″ foam sides, which holds rebar and eventually, a 6″ concrete core.

R37edit (1280x853)The blocks have rows of interlocking teeth- picture a front wall made of enormous foam Legos.

R24 (1280x853) (2)The wall grows

R34 (1280x853)We inserted vent tubes into big circular holes in the wall, along with electrical penetrations.

R2 (1024x683)

R32edit (1280x853)The final challenge was cutting the curves into the top of the foam to create the contour of our dome front walls. Zach did this with a reciprocating saw while I held onto his belt loops! Then tons of bracing to make sure the walls don’t shift or bulge during the concrete pour, and disgusting yellow insulating foam to fill in all the cracks.

Pouring concrete into the front wall:

R29edit (1280x853)The pump reaching over the domes and shooting concrete into the front wall:

R27edit (853x1280)Damien of Ron’s Quality Construction guiding a huge tube of concrete into the top of the front wall.

R36 (1280x853)Dan, who arrived from Vienna via D.C. the night before pour day, got up at 5:30 am to help us out. And he was EXCITED about it!

R28edit (1280x853)Dan agitating the poured concrete to prevent air pockets by pounding a 2×4 on the side of the wall

R30edit (1280x853)The now-concrete walls.

IMG_9760Evening wanderings with Jenevive and Bryan

Building, Thinking, Dwelling

As I simultaneously plan my move from Santa Barbara to Pittsburgh and get ready to build a retreat house with my sister in northern California, the notion of dwelling has been on my mind. What does it mean to dwell, to call a place “home”?

In a late essay, “Building, Dwelling,Thinking,” Martin Heidegger links dwelling to thought and building. To build, or to think, one must first dwell, which is to say inhabit a particular relationship with space:

“The nature of building is letting dwell. Building accomplishes its nature in the raising of locations by the joining of their spaces. Only if we are capable of dwelling, only then can we build.” (Poetry, Language, Thought 157) Similarly, thought belongs to dwelling as an ordering of space.

I think this is right. To dwell is to inhabit a place, in body and mind: to be sheltered by it, to be sure, but also to mend it, modify it, shape it, explore it, contemplate it, meld with it. As Virginia Woolf famously proclaimed, every woman needs “a room of one’s own” to properly develop as a thinker and creator. Such a dwelling place affords privacy, or relative protection from the tumult of the world and the thoughts and demands of others. Shelter, in this sense, fosters independence and creativity by providing a break in the affective, material, and ideational flows of our culture, introducing stoppages that allow for mutations. Creativity.

This is not to say that thought develops in a vacuum; to dwell is to engage one’s surroundings and thus also to give up some forms of agency. Dwelling is a being-with. What all should be included in this circle of cohabitation? Physical structures, ideas, affects, animals of many sizes and types (including other humans), plants, pollen, textures, surfaces…

House-site-2

Near the build site.

There are many different possible relationships that one can form to one’s dwelling, and social relationships that can form within and around it. Nomadic peoples trace patterns on a landscape by moving through it; not the individual place or structure, but rather this larger map of habitation, constitutes the home. Nomadic living is also nomadic thinking. Likewise, farmers dwell in part by rethinking the land around them, narrowly circumscribing their resources and range to produce something new.

In the US, at least since the 1930s, the average home has grown steadily in size even as it has housed fewer people. In the 1940s it became a stagnant site of middle class consumption (occupied by a nuclear family, the basic Keynesian consumptive unit in Postwar America) which is being partially restructured today as a neoliberal site of self-improvement and flexible workspace (the home office).

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Given these conditions, it may seem shocking that the majority of new houses are built for yesterday, not tomorrow. There is something conservative about dwelling, as if our large, empty houses and always-on temperature control will somehow stave off the destruction of the planet, ongoing outside. This is building and thinking cut off from dwelling.

view

One view from the build site.

With this in mind, my sister and I set out, a little over two years ago, to conceive of a house for the future. One that wouldn’t take energy for granted. One that would serve as a dwelling place in the fullest sense: a place to live in, live with, and think among. Our basic guidelines were that it must serve the future needs of others, at least 250 years into the future, must not rely upon petroleum-based energy, and must be a dwelling place that inspires creativity, not utilitarian grimness or hermetically sealed escapism. With these constraints in mind, we were forced to design far beyond our own needs, and our own lifetimes. Such a dwelling place must be tough to last so long, but it must also be supple, flexible in use, to remain capable of meeting the unknown.

In the end, after a long collaboration, we chose to build two half domes, constructed out of a shell of concrete (dome structures are the strongest possible from an engineering standpoint, and thus require far fewer materials than equivalent rectilinear structures) and mostly buried in the earth. Not wooden boards and siding and shingles to keep the elements out and the heat in, but soil and wild grasses. Building out of wood ensures horrifically poor energy efficiency. What you save (in environmental as well as monetary cost) in the production of materials you lose many times over during the lifetime of the building to petroleum energy production in order to keep it warm and cool. Our structure will require far less energy to maintain, as it will heat and cool itself. One large retaining wall, facing south, will gather through many windows the heat of the sun in the winter. In the summer, the house’s under-soil condition will keep it cool without air conditioning. When additional heat is needed, it will be generated from solar thermal collectors that will turn sunlight (even pale winter sunlight) into hot water, stored in a tank inside and distributed throughout a radiant floor to keep the structure warm. When there is no sun, a powerful electric water heater will make up the difference. A solar photovoltaic system will generate the electricity for such needs. Will all of these advanced techniques cost a fortune. No; this house will cost significantly less to build than a traditional structure.

Most importantly, this will be a space unlike any other. One half dome will have no “walls” at all; it will be a large Great Room for meeting, working, cooking, relaxing, and viewing the beautiful valley below our building site in the mountains of Mendocino County. A short passageway will connect to the second dome, which will provide the “room with a view”: private rooms to sleep, work, contemplate. Fewer flat walls, and almost no conventional ceilings, will provide a new sort of space to think in and with. What sort of thoughts will such a space generate? We cannot yet know.

We are building this as a retreat house, because it only seemed right to share this with a collective of individuals who want to partake in its construction and maintenance. No one person, at least for the foreseeable future, will monopolize this space. It will see a constant infusion of new dwellers, new purposes, and new ideas.

I will always maintain a dedicated page on this site to the house, which can be accessed here. I will also continue to blog about it as we build it (we start on the foundation next week, but the extended process will continue for at least another year) and learn to dwell within it. If you wish, you can join us.

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