I have a 10 year old existing strawbale house with earth plaster in SW Texas. The plaster may not have been mixed or applied properly, as it erodes when rained on. It has a large overhanging porch, but when rain and wind come together the wind blows the rain onto the walls and a good quantity of the plaster washes off each time. My question: Is there any type of waterproofing paint or hardening mixture that can be applied to stop or slow this eroding problem? I would rather not apply a full re-plaster with lime or cement based plaster, but am open to all suggestions.
