This is the FIRST of two energy audits.
Energy Audit #1, today's energy audit of the prefab modern house, is as we're at the "This is the modern house kit + cladding + the homeowner sealing around the windows stage", the second will be once we're "done, finished, kaput, as in done, done, done, done, don't ever want to think about anything construction related for at least another week DONE."
Our mission is to create tight, energy efficient, gorgeous passive solar house kits. I admire rated, certified, even more stringent approaches, like Passive House standards, maybe we'll do this in the future, but we achieve what we want in an energy efficient home while incorporating great modern design on an average, reasonable budget.
Some highly energy efficient homes incorporate two door chambers to prevent temperature loss.
I picture the way I live, and it is just too chaotic and messy to make such an entrance successful. Can you imagine a couple struggling with the stroller, dogs still on the leash, juggling a bag of groceries and a baby on one hip, getting the key in the door lock then screaming to the spouse...
"Quick honey, seal the chamber, we're losing LEED points!"
Obviously if you live in a severe climate, it makes sense. But we're in Normal Rest-o'-Tha-World here.
We're a muddy, raggedy bunch here... why do ya think we're bandits?
You can increase the thickness of the house kit panels, choose even more efficient doors and windows (our casa ti prefab green home is spec'd for Jeld-Wen and our, SIPs house kit with two stories, The R1 Residential, is spec'd for Marvin Integrity), seal it up even tighter... but my focus is on affordable energy efficiency in our prefab green homes, so we chose great solutions that fit within a moderate budget.
The average quote for the casa ti windows is currently about $9,000-$10,500. If you would like to spend more on windows to make 'em nano-crazy-efficient, go for it, we can adjust the shop drawings. But expect the added cost.
We hired energy rater Guy DuBois, of No Energy Loss, to come out and inspect the modern prefab house kit.
These are the notes I jotted down during his cell phone call to me en route from the land. Mr. DuBois will guest blog later this week with more real data, but here are his initial verbal impressions of the still-under-construction, still-not-completely-sealed house kit:
"Well, we certainly smoked up your house quite a bit, there was nowhere for it to go!"
(Copeland's note: Ummmm, I assume he means it was some kind of smoke air test thingy? I hope he didn't mean he smoked in mah house?!?)
Ok, on to Mr. DuBois:
"Those windows - they are worth the money, they were very well sealed."
Copeland's note: Handsome Husband also sealed around the frames... OK FINE I will just stop commenting and just TYPE what he said!
"Your husband did a good job of sealing around the windows... there are two areas he also could look at if he wanted to seal further- along the south eave and that back door threshold.
It is surprisingly tight. I don't know why I say surprising, but I guess I didn't expect it to be so tight, even though I should have."
[Copeland's note: Um, yeah, thanks Mr. DuBois... ; ) OK, OK I'll stop commenting!]
"I'll go back at completion and run more tests. This was a good time to go out there because if there were problems you could address them before everything was closed up.
As you know, it's so tight you really must have mechanical ventilation, which you will be installing (HRV), which is critical in these energy efficient homes. Most homes, most traditionally-built homes, leak willy-nilly so you don't ever have to worry about air quality, but in energy efficient homes like these they're so air-tight that air-exchange is imperative.
I saw very little air leakage... there is some thermal bridging you can address if you want but you certainly won't have a problem heating and maintaining good energy efficiency, that's for sure. How does it compare to a "normal" house? Superior!"
To continue to seal even further, concentrate on the areas where there is lumber vs. SIP (structural insulated panels)- the doorway header, add insulation around wooden framing, and if you're in really severe climates, you could add an exterior seal.
Mr. DuBois makes a good point:
"But you have to consider the climate- maybe if you're in Alaska or really south Florida you would want to consider that, but... we're in Virginia, how much gain will you really get by doing all that?!? You already know that with your off grid systems, comfort will never be an issue.
I will be punching in everything I did today and coming back with some data next week... you're not trying to get this house certified, so this is just more FYI info, but it will be cool to compare today with when you're done at the end of the project."
He also said that the amount of leakage currently (we're still not done sealing) in the prefab SIPs passive solar home is equivalent to about 6 x 6 inches, smaller than a basketball. Handsome Husband is chasing that number, with sealant in hand.
Later, Handsome Husband arrived home, and I had all these pictures and video to look at... and share with you now.
HOUSE KIT ENERGY AUDIT VIDEOS:
Mr. DuBois sets up...
SIPs House Kit Energy Audit #1 of 2
They start do to the smoke test and pressurize the modern house kit. SUDDENLY, a clerestory window pops wide open! It had looked closed, but hadn't been closed totally, which certainly that had also contributed to our loss of temperature this winter at night! It is securely locked now... : )
Smoke And Open Windows In The Affordable Prefab SIPs House
So, they pressurize again...
Energy-Audit-#1 of 2 In The Affordable Prefab Green Home
And then....they freakin' fill mah house up with SMOKE!
Note the comment about the south edge- later they discovered that when the door was installed they didn't put any sealant under that south door. You as a home owner can seal that more if you live in a severe climate area. I knew the windows worked really well for our budget, but am pleased with how impressed he is! : )
Energy Audit 1 of 2: Smoke And Windows
Here Handsome Husband decides he's going to track down that durned elusive number.
Energy Audit 1 of 2: Husband Wants Passive Perfect
Then they go tramp around outside looking for leaks.
If there were gaps, you'd see the smoke drifting out.
Energy Audit #1 of 2 of the Prefab Net Zero Energy Green House
NOTE:The next week Handsome Husband discovered they hadn't sealed pipes inside for the audit + we haven't added the foam *around* the foundation, contributing to temperature drop / leakage. Stay tuned for Energy Audit #2!
Check out what it looks like when they crack the door (and how hard it was to open because of the pressurization - because the house kit was so tight!).
Energy-Audit-Of-Green-House-Kit
...And then they start calculating...
Which Mr. DuBois will go into more in his guest post soon.
Energy-Audit-01-16-2010-36 from Copeland Casati on Vimeo.
And thaz it, the latest from our passive solar green home!
Here is Handsome Husband's summary:
"This wraps up the initial test of the house kit. We now know what simple steps we have left to optimize the envelope of the SIPs house, and we look forward to the final testing after construction is (finally) completed. The general goal and idea of the casa ti has passed Mr. DuBois's testing with flying colors, as we already suspected in the prefab house kit's performance over the last few weekends where the design and structure were able to give us relative comfort in a hostile climate.
The great thing about the delays in this project is that we're able to thoroughly test the house kit without further improvements, this allows us to confirm the performance a passive solar house kit built with SIPs."




























The past two weeks have been overwhelming, hence the silence, and aside from meetings, we haven't anything new to show regarding our own
Our original plan was to visit an artist's studio he built with
Well, it has been a crazy few weeks. We got my sister married off (and her husband's family is from Seattle so they came in early to spend time with their Virginia family here so it was not just a weekend but a nice time over awhile of the families coming together)...
To finish the house, we need financing. The financing we did earlier was to refinance our current home loan because interest rates dropped so much. Now we need to consolidate the *land* loan and finish construction. We're increasing the *land* loan by the amount we need to finish construction since a traditional construction loan in Virginia does not understand or value green building or off grid construction / systems. Once construction is complete and we have a certificate of occupancy, we have been told by mortgage lender of our first house that they will consider refinancing the land *and* house. Because co-op interest rates are higher, Handsome Husband projects that once we have a traditional first mortgage, the monthly expenses will remain the same after the construction is financed. So we will be paying about the same, to do more, after having finished the project!
If ONLY the rest of the personal decisions we make as a family were as easy as it was erecting the actual
When I awoke last night to an unexpected thunderstorm, snuggled in my bed as it rolled, rumbling, in, I reflected how our visit in previous years would have ended first thing in the morning, packing up miserable muddy wet dogs and children in the rain. Instead, we contentedly listened to the rainfall as the children played together indoors while the adults slowly woke with steaming strong coffee.
Another thing I noticed was... how grateful I am I chose polished concrete. SO easy to sweep and keep clean. We also have recycled pallets at the doors which have been extremely useful to curtail the dirt- it looks coolio industrial, is recycled, and provides a great function.
More on this later, but if you would like to tour our
So, next, we begin the interior framing. We install systems. We survive children out of school for the summer. ; ) AND some big family reunions scheduled... so June coverage might be a little spotty.
The 8 acre field can be rotated with
There is a smaller field downhill from the home site we could irrigate with rainwater... we've tossed around ideas of growing some kind of crop there, like asparagus... but the reality is that as it is much deeper in the woods it will be much more accessible to wildlife... but it's something to think about...
Handsome Husband and the
We also met with
The first hint came when Handsome Husband nailed up some old sconces. Yes, they do help light the interior of the unfinished SIPs - exposed house kit, but... um... Fortunately they dribbled wax onto his pristine-just-polished concrete floor so I suspect that will be that. But we shall see... never underestimate Handsome Husband. 











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