Combination projects involve a retrofit roofing system designed in conjunction with a new building addition. The new building may be a metal building or conventional construction. In the most common applications, the placement of the new structure in relation to the existing building causes a problematic drainage condition. Retrofit systems offer a cost effective solution for proper drainage.

The design of new building addition and or use of a Retrofit system as a combination to the new construction can alleviate potential building leads due to improper draininage and or future need for a Retrofit "infill" project. AEP Span has the ability to prevent future building problems with the use of properly designed Retrofit Systems.

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