Wood-fired earth ovens: experiments in DIY firebrick (aka “castable refractory”)

I’ve been experimenting with cheap ways to improve lo-cost wood-fired earthen ovens. How can I make mud denser, harder, and more durable? Without going to bricks and/or spending a lotta dough? Adding sand to mud reduces shrink and increases density. But clay and sand are generally still less dense (hold …

Combining Earthen and Masonry Techniques in Wood-Fired Oven Construction

Is it made of earth or brick? This is a common distinction in the world of wood-fired ovens and comes with a whole slew of assumptions. “Earth ovens are cheaper, easier to build but less durable.”  “Brick ovens are expensive, harder to build but more professional and will last longer.” …

How to Make a Rocket Powered Kiln of Clay and Sawdust

Jon and Flip Anderson have been working with stoves and ovens for some years now (HPP regulars may remember their rocket powered oven design.) Last February, they helped teach at the Winter Stove Workshop put on by Aprovecho and InStove. Aprovecho Research Center (ARC) was consulting for Mercy Corps in …

Mass Heater for a Greenhouse Using a Wood Stove

Kiko Denzer and I were hired to build a heater in a greenhouse for some very avid gardeners. They had experimented with using a wood stove but there simply wasn’t enough heat retained for the stove to heat the greenhouse from one day to the next throughout the winter. Our task was to incorporate the old wood stove, mostly taking advantage of the glass door and firebox it offered, and plug it into a system with channels and enough mass to absorb sufficient warmth to heat the greenhouse with one firing a day. This article chronicles that build and the results.

Testing the Limits – Adobe Heaters in Argentina

I have recently built three single-skin masonry heaters in Argentina using unfired bricks and would like to share some thoughts and an account of the experience.  All three were based on the design presented by Alex Chernov at the 2012 MHA Annual Meeting at WildAcres, with minor modifications to accomodate …