In a break from tradition, Paul isn’t sitting down with anyone this time and is instead providing a bit of an update before switching over to previously recorded clips with an expert timberframer with 17 years experience by the name of Caleb Larson on the subject of the Wofati Greenhouse that didn’t make it into the movie.
Paul’s got another little Kickstarter project up for another week and a half for a new movie about the rocket mass heaterjamboree (linked below) that’ll be active for another week and a half at time of writing. A bunch of summer events are coming up, including a Permaculture Design Course, Permaculture Technology Jamboree, and a SKIP event.
First off: despite outside temperatures reaching -12F, the greenhouse never froze, so that’s a major success. Better yet, tracking thermometers at the bottom of each thermal well recorded a steady 46.2F, with added reflectors on the pipes increasing temps to 48.5F for the west well with 1 inch pipes, and 48.0F for the east well with 1.5 inch pipes. The mass at the back of the greenhouse started at 64.9F in August, dropping to 41.7F by March 14th and is steadily warming back up since then.
Since Caleb last helped teach woodworking at the lab eight or so years ago, the standard of woodwork has been steadily increasing but is still not up to his level, as can be demonstrated by the Wofati Greenhouse’s use of metal and rebar in its construction whereas Caleb would use wood only and a few different styles of joinery – so no Allwood Valhalla yet! Not to discredit the use of metal though – it’s fast, strong, and is needed to get most standards officials off of your back.
Dr. Hugh Gill Kultur
Jocelyn Campbell Bill Erickson
havokeachday Julia Winter, world's slowest mosaic artist
Polly Jayne Smyth
"To do good, you actually have to do something." -- Yvon Chouinard