When it’s time to plaster your cob walls you will want to make use of finer materials. Rocks, big pieces of straw and the like can really screw up the finish, that is if you are going for a smooth surface. Recently I have started buying the quartz silica sand from my local home center for $2.50+ a 50 lb. bag. The silica sand is a pleasure to work with. Fine materials can create fine results. $2.50 a bag can add up quickly for a large project.

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