Prefab Green Home: 1st Energy Audit Of The SIPs House Kit!

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

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."

 

Prefab Green Home Takes On The Wind Chill. And The Passive Solar Net Zero Prefab Fabulously Triumphs.

Wind chill of 14? Actually, I was corrected: The wind chill was FOUR. 
It's a windy day at the prefab green home.

As long term readers might notice, during extreme weather our favorite game in the net zero modern prefab (still with no heating / power systems installed) is to compare the outdoor temperature with the indoor temperature.

We have no heat. We have no electricity.
But we certainly have fun measuring the effectiveness of the structural insulated panels + passive solar design in the prefab house kit on a dinky (one arrow missing that's supposed to indicate humidity) thermometer.

A Lovely Lady From Leeds : )  asked,

Mel, I don't know. We certainly can (and should) have someone measure it, but because it is our private home despite my being the founder, well, I previously thought, "Eh. It's more fun doing the dial-y thermometer thang."

Your interest has prompted me to take it more seriously and add it to the "to do's."

[I have a similar attitude towards LEED accreditation. Don't kill me! (The firms are all LEED accredited; I just don't see the benefit for the consumer to certify a house they don't intend to sell, and am approaching this house as an "average" consumer of my own house kit. ]


This is all stuff we as professionals know, documented by passive haus, passive houses, SIPs manufacturers, etc., but when I (even though we intelligently know it) put it into practice by turning a thermometer into a family game... oh, it's so much more fun. : )

In summer, we marveled at 100° harsh heat in the fields, yet inside the off grid prefab green home, it was a comfortable 85°, and the cross breezes from the open windows made it even more pleasant.  Now we test the prefab house kit in icy, bitter temps with a few intermittent days of overcast skies.


Handsome Husband reports: "Windchill is 4°.  Last night it went down to 18°, today's highs will be 27°.  Yet the prefab green house kit is 45° on arrival."

Yes, that's cold.
But it has been overcast for days in temperatures in the teens and twenties. This proves that despite daily temperatures being such, the interior of the prefab green home will not freeze.  This is great news.


After spending a day researching modern supercoolio wood stoves after discovering the promised family wood stove was mine no longer, I admit defeat: Why would I spend $1,500-$3,500 on a modern, cool  wood stove we will use so little in the energy efficient, passive solar SIPs house?

Yet the wood stove is comforting as back up once our solar systems are installed, there to dry wet mittens and sopping snow clothes and to cook on if need be.

It's 11:00. Handsome Husband calls to say the prefab house is already 49-50° from him just moving around. Imagine how fast a big wood stove would heat that efficient, insulated space...and then overheat. If it's easily 50s inside when the temperature outside will not rise above freezing today, our original concern is correct - we would easily overheat the house with a big stove.

I researched battery-powered heaters, but they were either too small or not exactly safe for indoor use. [Understaaaaaatement!]


So... we bought a wood stove.
It's ugly. It's not a nostalgic family hand-me-down.

It's definitely not modern. 
Handsome Husband is consoling me with, "Well, you could kinda cook on it..."
*sob*

After spending the past 24 hours frantically researching what new products have come on the market since I last looked (a lot of nice modern wood stoves now), in the end I said, "Fine, solve the issue NOW, let's pay someone to install this NOW, so we can freaking enjoy our prefab modern house kit NOW."

Each dollar we spend on something unexpected (like the unexpected cost of a $1,000+ wood stove) is a dollar that should be going to off grid solar systems and hiring local labor to install them.

We will now bemusedly note how many years the original, "free" wood stove given to me will sit in my parent's basement until Mr. Wil "I Will Sue You For Everything You Own" Sakowski claims it... IF he ever does.


[Readers: Please bear with me in these last two posts as bitterness tinged these references... My life, and my dear, lifelong friends are an entirely happy different story. It's all good. : ) Besides, being a bandit is much more rewarding and adventurous. ]

Handsome Husband calls:
"I'm leaving! And in the prefab house kit it's 54 degrees." (3:40 p.m.)
Me: "What'd you do?"
[Understaaaaatement!]

He...

• Met with the roofers
  
• Unloaded the modern bed and put it together
• Installed the Danish mid-century daybed
  
• Drove to Appomattox and bought a wood stove
• Examined the scouting camera (Awwww, Bambi!)
• Sorted some of the VMI basketball wood
  

Y'know. That's all... ; )
Stay tuned...
The next post is where I rearrange all the furniture.

 

Prefab Modern Net Zero House Kit: The Temperature Drops

I just love this time of year here. During the drive to the modern passive solar prefab house kit, I look at each repeated scene, field, and farm we pass, over and over through the seasons and years, and I never tire of it, never fail to be amazed again and again by each moment of beauty.

In the pinks and golds of dusk, you really understand O Purple Mountain Majesty / Above The Fields Of Grain...

Ok so maybe I mangled our national anthem a bit, but that's what I see: the brown tinge of autumn, bales of hay still in some fields, the silvery wood of old barns in the slanted winter light... and in the distance, the blue ridge mountains, and they ARE purple.

Being here now means the temperature drops to 30, so we dragged in a propane heater from the shed to help the passive solar prefab during these bitter black nights. And yet, arriving as the last light waned, we found the prefab to be a comfortable 61 before we added the heat!

Oh the stars... the winter stars, so clear and gorgeous no pictures can show you so I don't even try.
When we awoke, the soil was ice.
Inside, it was 57/58. We fired up the heater and quickly it rose to 64.

Thanks to our solar cooker, I served a hot meal to friends without having to stand over a stove.

(Check it out! Passive solar house + passive solar cookin' = I can have more fun!)

It was a good thing we packed a lot of food (we served butternut squash soup made by Handsome Husband, a casserole I made the night before, and homemade bread/butter), because Mrs. Esh had her store closed, which led to lunchtime speculation over a possible Amish wedding this weekend... : ) (November is when Amish wedding season begins.)

Living like this makes you appreciate systems so much, but I admit I savor the edge it brings, just as I remember what it was like to camp here in our 1960s teardrop camper just a year ago.

Speaking of systems, Handsome Husband will guest blog for you technical people this week on Everything You Wondered About The Systems And How The Heck They Are Fitting In The Net Zero Off Grid Prefab. As for myself, I am off to take my first shower in three days.
Yes, I want my net zero prefab systems too. : )

 

I am playing with Posterous + Google Wave while killing time to go to my parents.

Reply Edit 11:19 am I am playing with Posterous + Google Wave while killing time to go to my parents. Here's a pic from last year's Thanksgiving there! : ) Bienvenue Bienvenue (yes, I named one of the Prefab Cottages after their house, in honor of them) was built in 1801 on a farm in Hanover county, then moved to Richmond in the 1920s. Oh wow. In looking for a pic of my parent's house I just found a bunch of prefab house kit pics - it was this time LAST YEAR our mod prefab house kit arrived!!! The house kit / shell / windows & doors went up in about a week. And here it is a year later and I haven't done the interior. We're doing it in stages because we won't move there until the children finish 5th grade because they are in a special educational program. In the meantime, we're certainly having fun camping in it! So, for fun, here's some pictures of the prefab modern house kit from last year arriving and being constructed on the land! (More videos, etc. here in the October / November / December 2008 archives: http://www.greenmodernkits.com/2008_11_01_archive.html) Amish forklift The SIPs house kit panels are unloaded Putting together the prefab... Prefab house walls going up... Prefab construction... SIPs A storm approaches... On the roof... From the north... Getting weather tight... Interior... clerestory windows... Windows go in... Week 1: We have shelter!!!! Well, there's some pictures from week 1 of our modern prefab net zero house kit! After years of camping in that 1960s (still beloved) teardrop camper, I am grateful for the shelter and energy efficiency of the prefab passive solar house. Reply Edit Reply Edit

 

Another Net Zero Off Grid Weekend In The Prefab Modern House Kit

After a week of rain, the sun broke out and the skies were blue as we headed to the net zero prefab modern house kit!  Still with no systems installed, our net zero off grid prefab was cozy, and lovely to visit.

I know better but I did it anyway: I am starting to slowly drag furniture out there, knowing full well the construction dust that will soon ensue.  Years ago my Handsome Husband discovered this stackable bookcase in a thrift store. He thought it terribly expensive ($30), but loved its soft curves and that it was solid wood.

It was then reused in my home office, then reused in an infant's room, now to be reused by all of us in the prefab house!  I will give it a fresh coat of paint this spring, but in the meantime it anchors the east side of the south room, beginning the interior design and use of that area as I envisioned: the reading corner. 




When I thought we would have a wood stove (no longer necessary as we installed radiant heat in the polished concrete foundation), I mentally placed the stove against the center wall, then a circle of floor pillows and books within cozy, languid reach.  The bookcases you see are open on each side; so I envisioned mid-century Popular Mechanics, books on "How to do XYZ (insert something fun, educational, practical here)" and Countryside Mags facing the casual reading area, then on the other side of the bookcase and facing the south view grouped with the more adult furniture, you can discover high design / architecture magazines and books.

I am still mentally working on these groupings... In the meantime the bookcase will stay against the wall and be a bookcase / kitty cat climbing cave for a certain 5 year old.

The purple Steelcase chair was found for $3, a 1970s contract furniture piece. We have two in purple, and two in mustard.

I added books that we have been collecting:

- Mid-century volumes of encyclopedias and United States history for children (the illustrations are *incredible*)

- Old Countryside Mags (full of reader tips and wisdom!)
- Mid-century Popular Mechanics (again, the graphics rock AND it's fun to learn!)
- Lots of Civil War and Virginia history books, written from many perspectives
- A large volume on historic Charlotte County
- Brochures and guide books on cool Virginia state parks and history sites to visit
- The usual Dwell and Metropolis Mags

Without my having to explain my interior design intent, I turned around and the furniture and area were being used exactly as I imagined.

On Saturday we emerged out of days of cold and rain to see highs of 60ish, and dropping into the low 40something. (40-42)  Inside the modern prefab, *still without systems*, we arrived to find the temperature reading 62; and, after an evening of 40ish, awoke to find the house at 59.

We will further insulate the passive solar prefab by adding foam around the exterior of the foundation before infilling the earth around the prefab house, and adding sealant around the windows before finishing the interior walls.

Next we will add more recycled, reused furniture little by little, bringing something out with each trip; and of course start the interior walls and systems.  We thought our first quote for finishing the off grid electrical / plumbing to be high, so we are still gathering quotes. Stay tuned...