Allowing structures to breathe reduces or eliminates condensation and rot. Portland cement can become brittle as a result of it's high burning temperatures Permeability- Good vapor exchange qualities allow for condensation dispersion. Through crystalline bridging, using the free lime content, the lime mortar will heal those cracks that occur. Allows for minor movements.If the building moves, a lime mortar will move with the building. Elasticity-Important in minimizing shrinkage and cracking. Below are some key advantages to using Natural hydraulic lime as a stucco on strawbale. This is due to its purity, its calcium carbonate composition, it's CO2 absorption, its longevity and potential for allowing the materials to be reused or recycled, and the result of a low energy production process. I used Hydraulic lime plaster because it is one of the "greenest" materials you can use in construction. I purchased it from PA Limeworks in Allentown, PA. This is a very old building method, in fact Saint-Astier Natural Hydraulic Lime was used to build the city of Perigueux in France in 30 B.C. I use the St Astier Natural Hydraulic lime and I'm very happy with the result. This is what I'm using as a exterior stucco and interior plaster on this project. Lime has a long history of use, serving both functional and decorative purposes. Lime Plaster refers to a mortar using only pure lime as a binder and sand as an aggregate. This Instructable shows how to work with hydraulic lime plaster on a strawbale building.
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