A contractor finds that two different GAF shingle product lines—Timberline HDZ and Timberline AS II—are being mixed on the same roof to finish a job. What problem could this cause?
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A
No problem; GAF shingles are interchangeable across lines
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B
Aesthetic mismatch and potential warranty complications since products have different specifications
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C
The roof will fail structurally within one year
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D
Only a color mismatch occurs, with no warranty impact