Proper quality assurance during roof system installation can be
an important element for long-term performance.
Quality assurance—unlike quality control, which is
performed by roofing contractors—is the responsibility of a
building owner or his or her designated representative, such as a
licensed design professional, roof consultant or general
contractor. The purpose of quality assurance is to verify the scope
and intent of a project's contract documents are being met and roof
system materials are being installed in accordance with contract
documents, manufacturers' installation instructions and accepted
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