Category Archives: erik-green

Important but…

OK, so it’s been about 3 years since we moved OUT of our wonderful “almost passivhaus” house in Stow, MA… a few comments (now that I have a little distance) about things I would do differently.

1. Building a passivhaus in very cold climates is important but not *that* important. Our’s was REALLY close but even getting as close as we did was VERY expensive because it’s such an unusual thing but also because the climate is so extreme that the insulation needed (to do it right and not have condensation problems) is expensive. Condensation… see book: Builder’s Guide: Cold Climates

2. Building a cube is… not that important.

3. A custom design is… not that important.

4. Building the house so the roof points EXACTLY solar south (or whatever your designer tells you is absolute best for PV solar panels or passive-solar) is…. not that important

5. Small windows on the North is… not that important. It’s important, but not at the expense of views and connection to nature.

What to do instead:

1. Instead of passivhaus, do something more along the lines of the “pretty good house” with 10-20-40-60 insulation. Why? You can get 90% of the way there for $100k or more less money which would be more efficiently spent on saving the planet with solar panels. The house will be just as comfortable.
Read more:

Good example: Bick Corsa’s house

2. There are lots of energy efficient houses in recent years that are tall little cubes with footprints on the scale of 26×26, and sure that is a LITTLE more energy efficient and uses less concrete for the foundation or basement, but it also is less ideal for 1) entertaining since you have a small 1st floor 2) little kids … stairs to get to bedrooms and playrooms means more separation… they want to be closer to the action which is in the living room and kitchen. Sure there will be a time as they get old where being farther away is good too, but there are ways to do both.
So… instead?
They get knocked a lot, but the classic split-level ranch we have found to be the ideal compromise. Everything is a half-flight away and there are long views that are right out of A PATTERN LANGUAGE. It’s a popular design for a reason. And number 3) a wider foot print means more space on the roof for solar panels.

Book info: A Pattern Language

3. Since you are interested in this stuff, you will most likely be perfectly happy with a stock plan … just build it with slightly thicker walls for more insulation — either a double wall or with crosshatched studs. Your interior rooms will be at most 6″ smaller and the only details to have worked out is how to frame the doors and windows a little differently and just be careful to pick a plan with a simple roof line so that air-sealing is straightforward. This doesn’t have to be so difficult.

4. Getting close to solar south is good, but even a full 45-degrees off will work quite well. Solar panels are MUCH cheaper than they were just a few years ago so you will still get huge savings, especially if your electric company allows net-metering. But even without this, it’s still worth it — we didn’t have net metering in Stow at the time and it will worked out $$-wise. You’ll see by changing the orientation at PVWatts that it doesn’t matter that much.

5. Do some windows you want on the North. Not worth sweating it. It’s worth the extra $100 a year in energy costs (because this is literally how little we are probably talking) to have the view and house design you want. If you fell guilt get the *even fancier* windows with even more panes of glass and better insulation in the frames. If it’s the environmental damage that concerns you… buy some more carbon offsets or PV panels for your neighbors house, ride your bike more, or cut down on your meat eating. Lots of other things to do.

What does matter instead:

1. Location location location. Our solar panels in Stow generated as much energy as we used doing extra driving vs living closer to our work and schools in a less ideal house. And living in a walkable neighborhood close to friends, shops, nature, etc. Our Stow house was in a dream location in terms of nature… amazing quiet and nature and trails and water. But the driving was a bit much for us.

2. Connection with the site. Views. The yard you want. We had that in Stow, but just be careful to not let the tail wag the dog. Sometimes a certain house design will just not work with certain sloped lots. That’s OK, do something that makes sense for the location and site you love!

3. A garage. OK, build it separate or not (it can be designed to visually loot connected, but all the air-barriers can keep it separate). But build it! 2 reasons: 1) even more room for solar panels. 2) Could allow you to build a smaller house, but leave some unfinished space for bonus room for later, or for storage space (if you are not building a basement or attic) We are an active family and need room for 1) bicycles, scooters, skateboards, ramps, ski equipment, camping equipment, kayak, canoe, etc, etc. It’s very difficult to fit this amount of active gear into a small shed. That was our experience at least! Just build the garage. They also work very well as a mudroom. (Also a must have but a section of garage can do pretty well double duty as a mudroom. I’ve also seen a screen porch work very well as a mudroom….)

See also:
My further comments about A PATTERN LANGUAGE

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Filed under erik-green, green, hindsight is 20-20

Global Warming: What’s the worst that can happen?

Even if the chances are something small like 0.1% or 1% or 5% that human-caused global warming/climate change is
1. happening
2. substantial
3. and there is something we can do about it

It is still worth taking action because it’s not that hard to take action and the risk that it is real is HUGE


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We need new rules for biking / bikers

Reasonable ideas…

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EU emission laws will impact US as well. In a good way.

For example… BMW sees the future vis-a-vis tough emmisions regulations in the EU and is moving more and more towards electric and plug-in hybrids. This will clearly impact the cars they offer in other parts of the world, and will also influence other automakers.
(By way of Paul Graham

I realize that the cars will only be as “green” as the electricity they use, but here is a US map that analyzes how green the electricity grid is when used for an all-electric car:

“… Below is a map of the updated regional estimates for global warming emissions for the 26 electricity grid regions across the US. Compared to our previous analysis, nearly every region of the country has improved emissions for EVs. ”

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effects #37: The road to hell is paved with good intentions

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Filed under erik-green, green, legal action, personal action vs movements, productivity vs procrastination, shifting baseline

The 7% smaller house

So you’re going to build an already-small superinsulated “pretty good house” (look it up).  And you’re thinking of doing double-stud walls.  Just remember that the extra 6″ or so adds up.  It’s on both sides of the house, so it reduces the usable space by 1 foot in each dimension — x and y.

Let’s say you are building a boring rectangle that is 24×32 (inside dimensions).  Well, that’s a 768 sqft.  If you had instead built 25×33 (with single stud walls) then that is 825  sqft interior.  In other words, you are giving up 57 square feet with your insulation.  And that’s 7% of 825.  So your house is now 7% smaller!!!  Just be aware.

Instead you could do:

1) larsen truss

2) 4″ of polyiso added to the outside.

These are probably both harder than double-stud walls, I am just commenting that you should compare apples-to-apples — same interior square feet — when comparing options for how to build.

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ecovillage AND don’t fly

Article title could read… if everyone lived in an ecovillage and DIDN’T FLY… (old news that flying wrecks one’s footprint score since it makes it so easy to go so far….)

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