Design freedom. Structural integrity. AEP Span is a leading manufacturer of architectural metal wall and roof panels throughout the Western United States. With a full-line of performance rated structural roof and siding, AEP Span provides the architectural community uncompromised design flexibility for new construction and re-roofing applications. AEP Span is committed to delivering the highest quality product line, excellent customer service, and innovative solutions that protect not only buildings, but reputations.