Make your own plaster practice board with a scrap of plywood
You don’t need to build a natural home to experience the joy that is natural plaster. If you want to experiment with clay and lime plaster, you can get some valuable practice with some very simple scrap materials. Read ahead and I’ll show you how.
A student floats a creamy layer of clay plaster during one of our workshops
In my recent series of posts, I’ve described the process for building and finishing a light clay straw wall. First there was mixing the light clay straw itself and stuffing it into wall cavities. Then I discussed how to prepare for plaster by making and installing wood trim, and coating the walls with a simple clay slip. Next I’ll describe how to make and apply a base coat (or scratch coat) clay plaster. Now it’s really getting fun.
A common design question when working with wood posts and concrete (or stone) is: how do you anchor posts to the concrete? Honestly, if we’re talking about a large structure with a lot of weight, gravity does most of the work and you don’t need a specific connection. A concrete post anchor may be necessary in a variety of situations, however. Here is a particularly slick way to anchor wood posts to concrete using a very discrete piece of hardware.
Gears quickly shifted this fall when I was contracted to build a wood shed in town. Up until a few weeks ago, I was trying to squeeze in as much work as possible on the ol’ homestead projects — the light clay straw outhouse in particular. I did end up getting the little outhouse to a good point. (Plastering season is over… unless for some reason we get a 60+ degree stretch in December. You never know these days, sadly.)
Anyway, the wood shed I’m currently building is a proper timber frame with wood joinery, which is obviously very exciting for me. Getting contracted to do a timber frame anything has been my goal since moving to Berea a few years ago. Here are a few photos of the building process.
Smearing clay slip on a light clay straw wall prior to plastering
Clay slip is an essential material for coating straw bale and light clay straw walls prior to plastering. Basically, it serves as an adhesion coat, essential for getting the first coat of plaster to stick to the wall. There’s not much science to making clay slip, and it’s really fun to smear. Here are a few really simple tips for making and using clay slip for natural walls.
Light clay straw walls are a great surface for finishing using natural plasters. Because the straw-clay is tamped inside of a stud wall, you have a fairly flat surface to start with, compared to something like straw bale which needs a lot of trimming and often extra thick plaster to achieve an even surface.
Here I’ll give some tips and suggestions for how to prepare a light clay straw wall to receive clay plaster, using our recent outhouse project as our demonstration site. In this post, I’ll talk about how to make and install wood trim, which should be the first step in preparing your newly built wall to receive clay plaster.
There are a few tricks you’ll need to ensure a quality job. Read ahead for my method…
Check out this collection of beautifully simple animations of Japanese joinery in action. These are great little demonstrations of timber frame joints interlocking together.
Making chopped straw with a standard lawnmower
Chopped straw is an invaluable ingredient for clay plasters and earthen floors. Unfortunately, it’s a bit of a drag to actually make the stuff if you don’t have the right tools or equipment. If you’re building a straw bale wall, you get the benefit of collecting the chopped straw once you shave your walls (which is commonly done with a weed whacker). But if you’re working on a different type of structure, you’ll have to find a way to specifically make the chopped straw.
The ol’ “weed whacker in a barrel” gets really old really quickly, and frankly isn’t that effective. If you don’t have a leaf mulcher or wood chipper, which are far more efficient, you can actually use a lawn mower with a bag attachment to chop all of your straw for plaster. Here’s how to do it.
It’s been quite the eventful September. The big news of the month is that we hosted our first Natural Building Workshop at the homestead. It was, in a word, wonderful. We had a very diverse group of 10 folks come out to learn all about cob, light clay straw, clay plaster, and clay paint. I couldn’t have asked for a better group. I’m continually amazed at the positive energy that is generated through these workshop experiences.
One of our projects was building the light clay straw walls of our new outhouse, which I’d like to document a bit here. This is an outhouse that will serve future workshops and large events (as well as being quite useful for just ourselves, too). The building is also a little bit of a “natural building showcase”, as it will have a few different types of natural finishes on display when all is said and done.
Read ahead to learn about how to build a light clay straw wall.
Putting roof decking on the new outhouse
Our first official natural building project on the land this year is an outhouse. Ha! I kinda love that. Right now we’re in the midst of framing a small two stall outhouse that will be one of the site projects for work & learning during our upcoming Natural Building Essentials workshop. This outhouse is going to get a pretty special treatment in the form of light clay straw walls and a clay plaster finish. The finished product should be pretty de-luxe.
Hi there, I’m Ziggy. In 2008, I launched The Year of Mud while building my first natural home. This blog is a collection of personal stories and experiences building with clay, straw, and wood over the past 15+ years. A few of the things that get me fired up are natural plasters, timber framing, & Japanese architecture. Since 2012, we’ve been hosting Natural Building Workshops so you can learn essential skills to build your own natural home.
