Span plywood is a plywood of layers with very high specifications, made from the inside using a kind of moisture-resistant glue. As for the external plywood, it is designed to be able to tolerate harsh conditions and can be used externally and internally. Sizes and sizes. Span play wood. Options start from 3 mm to 30 mm. And the dimensions are 3.05m * 1.525m or 2.44m * 1.22m.