What Type of Mesh to Use in a Straw Bale Build?
When building, the question of what type of mesh to use in a straw bale build is big. I show the use of 14 gauge welded wire mesh in my videos, and that is a great option; however, like any other application, it also has its downsides.
For one, it is expensive.
Secondly, using so much steel is a bit harsh on the environment.
So, what other options are there?
One option is not using mesh at all for most of the structure. This is only applicable when the structure is plastered with earthen or lime plaster, as cement-based plaster requires a structural mesh by code.
Another option is to use plastic mesh-like Tenax. It cuts with a utility knife and is lightweight, which makes it easy to work with. However, it stretches a bit, like the old days of chicken wire, so it can be difficult to maintain the desired shape.
Jute netting is an environmental option that will work well with earthen and lime plasters. It is a bit harder to find in some markets, but it is easy to work with and has a low environmental impact. It is difficult to shape corners successfully with jute because, like chicken wire or plastic mesh, it does not hold a shape well.
Stucco netting or even chicken wire can be used; however, I find them to be not worth the hassle. They are very flexible and sharp and made of steel. If you use steel, then I suggest moving up to the welded wire mesh, as it is far superior to stucco netting or chicken wire.
In any situation, whether no mesh, jute, stucco netting, or chicken wire, I recommend using stiff wire on the corners. The welded wire mesh I use is a great option because it holds a shape very easily.
This allows you to create smooth corners without the bumps and holes that you might otherwise have with the other materials. What mesh you choose depends on the design and finish you are going for, as well as your structural design.
Remember that the welded wire mesh I use in my How-To Videos can be used as the lateral shear design for the home, eliminating the need for shear bracing.
Although I no longer use that method as my number one option, it is still viable and a good choice for the owner-builder. I now use HardyFrames or other structural shear panels in my homes for shear walls. They are expensive as far as materials go, but they cut back on labor costs, which, as a contractor, are more of a priority than material costs.
-Andrew Morrison