Short Answer
Examples can include inadequate flashing, improper fastening, poor ventilation, incorrect underlayment, improper shingle installation, inadequate ice/water protection, poor decking preparation, improper penetrations, and incorrect ridge-cap installation.
Detailed Explanation
Common roofing installation mistakes include: inadequate or missing flashing at transitions and penetrations; improper fastening (wrong nail placement, too few nails, nails driven too deep or not deep enough); poor or no ventilation upgrade; incorrect or missing underlayment; improper shingle installation (wrong alignment, improper nailing, missing starter strip); inadequate ice-and-water protection (not enough coverage, missing in critical areas); poor decking preparation (installing over damaged deck); improper penetration installation (pipe boots not sealed, vent flashing installed wrong); and incorrect ridge-cap installation (using cut shingles instead of purpose-designed products, improper fastening). These mistakes compromise the roof's ability to shed water, resist wind, and perform for its intended service life.
Why It Matters
Understanding common installation mistakes helps homeowners ask the right questions and evaluate whether a contractor's proposal addresses each potential issue.
Common Mistakes
- ✕Inadequate flashing
- ✕Improper fastening
- ✕No ventilation upgrade
- ✕Missing underlayment
- ✕Insufficient ice-and-water protection
- ✕Installing over damaged decking
Questions to Ask Your Contractor
- ?How will flashing be handled?
- ?What ventilation is included?
- ?What underlayment and ice-and-water protection will be used?
- ?How is decking replacement handled?