Bricks built from brewing grains
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It was discovered that adding spent brewing grains to red clay bricks can increase their insulation capabilities by up to 30 percent.
Bricks are often embedded with polystyrene to increase their insulation abilities, but polystyrene and other synthetic materials can be expensive to make and bad for the environment. Spent brewer's grain, on the other hand, are often in plentiful supply, and have been proven to enhance the ability of the clay bricks to trap heat without sacrificing strength.