DIY Project: How to Build Your Own Modern Outhouse

For the cube, the siding is a knotty, low-grade cedar, which is usually the cheapest cedar at the lumber yard. Waldman coated all the siding (front and back) with Swedish pine tar made by Auson. Pine tar is a traditional Scandinavian wood preservation treatment that's been used for a millennia or so. You mix it 50/50 with linseed oil and brush it on with a rag. Let it dry for a few days and you're good to go. It's non-toxic, incredibly durable, and frankly, when coupled with cedar, much more long-lasting than this structure deserves.