Adventures in Straw Bale Home Building
by Andra Eaks
This September, Penn and I began building our cabin. Somehow it
seemed reasonable that two people, neither of whom had built a home
before, could construct a cabin in a few short months. Boy those
months felt long. We were part of a mad dash of folks trying to
make their homes livable before the weather became too cold. Such
pressure made for a few frenzied and tired months.
Sledgehammering the wall into place
By Thanksgiving, Penn and I were at a point where we had our cabin
ready for winter and could (whew!) take a break. We returned to
Dancing Rabbit after a short holiday trip, only to find our building
work wasnt complete. While cleaning up the cabin one afternoon,
we discovered our straw bale walls didnt look as stable. In
fact, some bales looked rather out of place. Uh oh, it seemed to
be because
. our roof was moving! (yikes!)
[brief interlude to explain our house]
We did some experimenting when we were building. Instead of a concrete
foundation, we used gravel and gravel filled bags. Our cabin is
a loadbearing strawbale structure. Its about as tall as it
is long, with a 45 degree pitch and features a sleeping loft that
spans half the cabin length. Atop the bale walls sits a rectangular
frame, or roof bearing assembly (RBA). Connected to the RBA are
the trusses, roof metal, you know, the parts that comprise the roof.
The gravel foundation, the steep roof pitch, and the sleeping loft
were construction ideas that hadnt been used yet on loadbearing
strawbale homes at Dancing Rabbit.
Tom gives it a shot When
you experiment, you learn, and in this experiment, we learned that
a sleeping loft causes differential settling in the walls, and in
our case, caused the roof to slide. Due to the extra weight of the
sleeping loft, the RBA and all that was attached (i.e., the roof)
slid westward. Actually, the roof movement wasnt that drastic.
The RBA slid along the bale walls about 6 inches. What drew our
attention to the problem was the slumping of the bales in the walls.
The bales in all but one corner of our cabin were no longer straight.
Granted, our walls had a certain degree of wonkiness in their original
state. But our walls looked as if they had been built by Dr. Seuss,
curving in or out; they didnt know the meaning of the word
plumb.
[back to our story]
Needless to say, this discovery was a bummer. Our first plan of action?
Stop sleeping in the loft. Then we came up with some fix-the-roof
ideas that sounded reasonable and a few that werent so reasonable.
Unfortunately, we couldnt find any how-to or instructions
on how to reposition the roof on your strawbale house. (Is this not
a common problem?) Penn and I figured out a logical plan, from the
list of reasonable ideas. We got our supplies together and asked for
a few volunteers give us a hand. The morning of the big event, everyone
(including dogs) was at our cabin to help, take photos, or sit in
the cheering section. We were ready to start. Whats the worst
that could happen?
A chain was attached to two eye bolts in the RBA. Another chain
was attached to the locust tree in front of the cabin. The two chains
met at a comealong, which is a tool used to move heavy
objects. The comealong would pull the chains taut and move the roof
back into place. Everyone was silent (including the dogs) as Bob
cranked on the comealong. People were stationed at every corner
to watch the walls for were-gonna-collapse-like
movement. What would that look like anyway? We didnt want
to find out. Then, whoa, the roof started to slide, and after a
few cranks on the comealong had moved back toward its original position.
It was amazing to see the one and a half ton roof slide so easily.
It was also rather scary, because we werent certain what would
result from the movement. After the roof was moved about six inches
we coaxed the bales back into place with sledgehammers. Bob at work
The hammering also massaged out any tension that had built up in
the walls during the movement process, thus preventing a spring-like
effect in which the walls would just push the roof back out of alignment
once the tension was let off the chains. Our walls had gone from wonky
to pretty plumb. (You cant have perfection with straw.) Rachel and Gare watch the action While
the roof was held under tension, we put posts against the loft side
of the RBA. That way, if the roof wanted to move again the weight
would be transferred to the braces and movement would be stopped.
Not that we wouldnt want to relive this fabulous experience,
but now, hopefully, the next surprising structural problem wont
be a sliding roof.
This winter, with months of frenzied building and roof fixin
behind us, Im ready to hibernate, back in our sleeping loft
again. But, our building days are far from over. Presently, our
outside walls are covered with stylish blue tarps to keep the bales
protected from the elements, until they can be painted with plaster
this spring. The floor is gravel covered with rugs. Some doors are
in place but have yet to be hung correctly. Not much can be done
to complete such tasks during the winter, though. The cabin feels
cozy now, but will be even more so once completed. It will be interesting
to see how our gravel foundation handles the weather and how our
RBA braces hold the loft. There are more building adventures waiting
for us in the future, to be sure.
Learn more about Straw Bale House Construction
Footprints in the Snow
* Hopper's Index * New
Member Bio: Gare * Lying alone
in plush tufts * Adventures in
Straw Building * Lady Builder
* Nature Corner * New
Member Bio: Tamar
|