A corrugated structure (100) having a first flat layer (10), a first corrugated layer (20) secured to the first flat layer (10), a second flat layer (30) having a first side (31) and a second side (32), wherein the first side (31) is secured to the first corrugated layer (20) on a side opposite of the first flat layer, a coating layer (40) secured to the second side (32) of the second flat layer (30), wherein the coating layer (40) has a melting temperature of at least about 450 degrees Fahrenheit and chloroform-soluble extractives of at most about 0.5 milligrams per square inch.