Reroofing and Recovering Design Considerations During the reroof design and specification phase, and prior to commencement of reroofing work, it is the building owner’s responsibility to have his architectural or consulting representative ascertain if the existing roof structure, with the new roof system installed, will meet all local building codes. NOTE: Koppers will not be responsible for any damage caused by loads on structural systems or damage due to change in location of dew point.  Return to General Requirements and Considerations for the Designer