On Monday morning of week 4 of the Shelter Series, faithful Brownie pulled up to our building site and let out a small polite groan. She was half buried in strawbales, which we were very happy to relieve her of.
Erica Ann Bush, natural builder extraordinaire and owner of Day One Design, also pulled up on Monday morning, and she quickly set to work teaching us about wall systems.
First we flung up a strawbale wall on the north and northeast sides of our hexagonal structure. There were some tricky cuts and custom bales to make, but overall the walls went up quickly. We then spent quite a bit of time and energy chinking the cracks with a heavy straw clay mix and getting the walls a little more flat and even so that they will be easier to plaster.
We then set to work on the southeast side. Batches of clay slip were wizzed up and many “salads” of slip and straw were “tossed”. Forms were attached to ladder trusses and we climbed inside them and tamped batch after batch of light straw clay down into them. Seemingly endless amount of the mixture disappeared inside, but slowly something rose up until late one afternoon I found myself standing on top of a rather splendid bit of wall.
This wall, like the strawbale walls, awaits several layers of plaster (and unlike the strawbale wall, this one will be a breeze to do!)
Moving right along, we turned our attention to some cob details around the front door of the Boathouse and on the south wall beside the timber frame where the french doors will go. On the french door side Erica Ann used wire to provide more framework for the cob, so we were able to build higher with it than the usual 18 inches per day.
We also started working on the southwest wall, which is composed of slip ‘n’ chip, or in our case slip ‘n’ plainer shavings. We tacked bamboo matting to ladder trusses and then tossed the fluffy clay slip and plainer shavings mix into the cavity, gave it a quick stir and called it good. We will of course eventually plaster over the bamboo matting, etc.
The remaining wall will hopefully be made of hempcrete in some form or other, and somewhere in the Boathouse we will incorporate a single adobe brick that we made, just for the symmetry of having 6 wall systems in a 6 sided building…!
It was a highly productive week, and one that generated a lot of discussion as we explored the various types of insulative and thermal mass systems. I think we all gained a lot of new confidence and got, if it is possible, even more excited about what we’re doing and why.
And as an added bonus, the Boathouse looks a lot more like a house that a…boat could live in!