The Passive House Institute US reviews the metrics and rationale of their standard on a three-year cycle. PHIUS+ 2018 was announced at the Passive House Conference in Boston this September, and I find it a brilliant and positive advancement.
Keep in mind that the Passive House Standard prioritizes energy conservation, so its main measure is the annual and peak consumption of space conditioning (how long and hard the mechanical system needs to work). When PHIUS+ 2015 was announced, it was noted that the space conditioning metrics were set so that the amount of insulation required to meet the standard would be beyond the cost-optimized amount; the 2015 standard was pushing hard on passive conservation. (more…)
The single-family home is a great American dream, one that so many of us have been fortunate to share; but as our attitudes and awareness grow and shift, so do the definitions of that dream. It’s time to redefine, to clarify what we’re after. It’s time to let go of the meaningless habits of over-consumption, artificiality, and toxicity that have become accepted in the past 50 years, and to embrace a new attitude toward the home in this country. It’s time for a manifesto.
The new dwelling:
Shall be just big enough. No wasteful spaces, no unnecessary basements, no duplication of function (multiple dining areas, extra bathrooms, empty “formal” living rooms, towering foyers…). A small house means more family togetherness and more outdoor space: garden, play and discovery spaces, porches. The small house encourages you to go outside. But, to quote a client of mine, privacy and quiet are part of comfort too, so the definition of “small” will vary by family.
Shall be efficient. Small is a good start in this regard, but it also must have proper window orientation and shading, a compact form, a superinsulated, airtight thermal envelope, and efficient lighting, appliances, and mechanical systems. This is not how it’s been done in the US, but it’s easy, actually, once you know how. It starts with a plan that flows well; storage is cleverly worked in throughout the house, and wherever possible, is moved outside the conditioned envelope; structure and cladding is considered from the outset to optimize material use. Energy modeling is done early in the design process so that the energy implications of design decisions can be understood.
Shall promote health. No more toxic materials!– Natural materials with minimal finishes predominate. The house shall be mechanically ventilated with heat- or energy-recovery, ensuring filtered fresh air throughout and managed humidity. That’s the baseline of “do no harm,” but we must actually do good–see next.
Shall promote nature-connections. No more sterile boxes that cut people off from the environment! Harmony with Nature is the foundation of health, arguably is the definition of health. Delightful use of sunlight, views to vistas, sky, and gardens enliven the interior. Enclosed outdoor spaces adjacent to the house promote indoor-outdoor flow and frequent use. Planters for vegetables, herbs, and flowers inside and out provide texture, fragrance, and food. Water is not seen as a problem to push away from the house, but an opportunity to create pools, rain gardens, even wetlands. The garden supports habitat. And the kitchen is an inspiring place to prepare good food!
Shall be durable. No more throwaway finishes! The skin should not require frequent maintenance, but should stand up to its climate, rugged and long-lasting. Structure, finishes, and especially moving parts like windows shall be strong; and the materials within reach and at eye level on the exterior should be inviting.
Shall be lovable. This is not about design dogma, a “look” or “style”–just authenticity. Some love a box, some love a gable; the new dwelling has a purpose and intrinsic character due to all the foregoing principles. As long as it meets these and resonates with its owners and surroundings, there is much room for expression and personalization–it needs to be loved.
Now go forth and build it.
So what does this new dwelling look like? Well, of course, it could take endless form; but to provide a prototypical starting point, I created a series of designs using American housing typologies. By starting with the familiar, we can appreciate both the timeless and the contemporary–you can easily see what’s new because the typical expression is well-known. These prototypes were designed to be broadly applicable, with suburban Chicago in mind–for lots slightly bigger than the Chicago 25×125.
The starting point for passive design is orientation to the sun, so there are several types here: a Bungalow which can have east or west street frontage, a Cape Cod with south frontage, and a Georgian with north. In all cases, there is emphasis on indoor-outdoor flow (porches and raised bed gardens are consistent features), interesting spatial experience inside, and great natural lighting.
Finally, here is a house based on a Georgian 3-bay organization grid, but loosened up with corner windows and porches. The front door and porch are low-key to the north, while the living spaces and bedrooms open up to the south, and a screened porch to the west. Like the other two, it has laundry up by the bedrooms, metal roof, borrowed light to the interior; unlike the other two, this has a cement-board panel with cedar siding exterior palette and a full height second story with a vented attic (above R-90 to 100 insulation!). It’s just under 1,800s.f., and again, would have a great feeling of spaciousness and indoor-outdoor flow.
So that’s a start on the road to the attainable, healthy, efficient house. I hope to build a lot of these.