One of the things which Manitou Arbor Ecovillage is doing that goes contrary to the customary trend of planning regulations in order to create a more sustainable way of life, is that we are choosing to specify maximum levels of resource consumption, rather than minimum levels. Many people aren't aware that there are zoning regulations which limit how lightly they can live on this planet. Typical Agricultural and Residential zoning classifications specify minimum lot sizes, lot widths, setbacks from property lines, minimum floor areas, etc. The only maximums specified are lot coverage, building heights, and numbers of unrelated people sharing a dwelling. Together these typical zoning regulations work to ensure rural and suburban areas have very low population densities, which at the time these model zoning codes were propagated, was presumed would protect the environment by making sure there was lots of "nature" around each family so that the humans wouldn't exceed the land's carrying capacity.
In practice, however, this ultra-low density, single-use development model actually causes more consumption of resources in the modern industrial society by lengthening the transportation distances upon which all these families are dependent and dispersing them evenly throughout the landscape so that public transportation can't be effective. Our zoning regulations directly result in rural and suburban "sprawl" requiring almost all family members to commute long distances in over-sized private vehicles each day for schooling, work, and shopping. Very little of the resources that sustain these single-family households actually come from the land where they live (at most some water and food), so there is almost no efficiencies gained in the sprawled planning model to offset the huge imports (and exports) of people and materials required. Country estates of 2 to 10 acres for a single family (typically only 1-4 people) are not uncommon requirements, yet in order to support such acreage, most families must resort to one or two full time jobs outside the home, leaving them little time to actually cultivate the land so that it can support them with food or fiber production rather than needing support. Often such estates grow nothing more than chem-lawns, which not only do not support the human population living there, they actually present a health risk and require huge fossil-fuel inputs in fertilizers and fuel to keep them mown golfing green short. Little land is actually leftover for nature or wildlife in this planning model, and families can be easily bankrupted by even minor increases in fuel costs, as we are seeing today. What is a one person "family" supposed to do with a typical min. 1200 sq.ft. house, and how is she to support it?
Manitou Arbor has chosen a different path by specifying maximum consumption levels rather than minimums, and our maximums are not arbitrary but are based on convergence points of efficiencies that can be acheived scientifically. By opting to utilize a Planned United Development Model for our zoning, we can reduce the transportation and utility inefficiencies inherent in the typical "sprawl" planning layout while not increasing the overall population densities beyond what is typical in the surrounding areas. By clustering our homes as closely as possible (without sacrificing solar access to each building), we are also preserving more land undeveloped around and between our homes so that we can create gardens and orchards that our neighbors will find more pleasing to look at than the tract house w/ chem-lawn that might otherwise have been pressed right up against their property lines in the traditional planning model. In order to create tight clustering while preserving solar access, it was necessary to create maximum building sizes based on typical middle-class home sizes in the United States. This ensures that a large family will not experience hardship living at the ecovillage, because our large house sites can accomodate buildings in excess of 3600 sq.ft. But we've also tried to shape our village deed restrictions to providing incentives for residents to carefully assess their needs and to build as small as they can comfortably manage.
One way that we have provided incentives for building small at the same time as we encourage energy-efficient building construction is by determining energy quotas for each site-condominium parcel which are based on the maximum allowable energy consumption under the Passive House Standard (www.passivehouse.com), multiplied by our maximum house size allotted to the parcel. The maximum energy consumption of a Passive House is limited by the maximum heating/cooling energy which can be delivered solely by the Heat Recovery Ventilator in a home. This voluntary standard for new construction or retrofitting existing buildings was invented in Europe over a decade ago (there are more than 10,000 today and growing exponentially) to create the most efficient buildings possible at the least up-front capital cost. Homes built or retrofit to its standard use so little energy that a 1200 sq.ft. home can be heated with a single electric heating element in the H.R.Ventilator the size of one found in a typical hair blow-dryer. The cost of huge furnace or boiler systems thus eliminated can be invested in the superinsulated building envelope required, thus keeping the overall cost increase as low as possible while protecting the family from rising energy costs for the life of the building.
Thus, if one wants to build a house to the maximum possible size for your lot in Manitou Arbor Ecovillage, you will be building to the Passive House Standard, but if you do not need such a huge house, you are still entitled to use that much energy and so you can choose to use a less-efficient (and less costly) building envelope such as straw-bale construction if you are building tiny at the ecovillage. It does mean that calculations of energy consumption will have to be shown for all new buildings at our ecovillage, but there are several energy modeling programs available for doing this, including free ones like Equest. If you are building to the Passive House Standard, you must use the PHPP spreadsheet for the calculations, available at low cost from the www.passivehouse.us website, and must have your calculations verified by the Passive House Institute. In our ecovillage, homebuyers will know the energy efficiency of the home they are buying just as they do when buying a new car - a simple concept long overdue in America, and essential to the long-term financial security of a family. And it drastically reduces greenhouse gas emissions, which is essential for having a habitable planet into the foreseeable future - now we are talking about real family values!
Pretty Green Brain
1 day ago


