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I have the opportunity to purchase some pallets of structural bricks, the cored ones with three holes in them. I want to use them to build a patio but I live in Ohio where the winters can get harsh. What, if any, would be the best route to take for this project? Ground is clay. Base of sand or gravel? How thick? Bricks laid with holes exposed or flat face? If exposed holes, would it be safe to sweep sand into the holes to fill them up or possibly dry concrete then water it? Thanks for taking the time to answer.