posted 11 years ago
We built a hybrid cob-adobe cottage last year, and rather than pay for straw, I harvested quite a lot of the fallen pine needles from the surrounding pine groves to use as the binding fiber. It was easy to work with, as long as you remove whatever sticks and twigs you happen to rake up with the needles, and just be sure not to throw too big a bundle of needles into the cob mix at a time (will get too clumpy). We were using a mortar mixer and used 5 shovels of clay with 1 shovel of sand and 1 double-handful of pine needles as our general mix ratio. It built up nicely, and has been holding up well. Seems like a good idea (so far) with the pine needles instead of the straw.