Ceiling Spots
• Caused by leaks in roof • Check attic or crawlspace for leaks in deck • Check chimney and vents for cracks in flashing • Check rafters for leaks that travel away from original source • Check roof for damaged shingles Damaged Flashing • Caused by improper installation • Caused by drying and cracking • Can usually be repaired without replacing roof Missing Shingles • Caused by improper fastening • Caused by exposure to high winds • Can usually be replaced individually Buckling & Curling Spots • Caused by improperly applied felt (buckling) • Caused by movement in deck (buckling) • Caused by undersaturation of felt in organic-based shingles (curling) Blistering • Caused by moisture in shingles • Caused by excessive use of asphalt plastic cement Algae Growth • Caused by growth of airborne algae deposited on roof • Unsightly appearance does not affect the service life of the material • Common problem in warm, humid climates • Algae resistant shingles available regionally Missing Granules • Caused by absorption of moisture by mat at the core of the shingle • Common problem with organic-based shingles Rotting • On newly applied shingles, a certain number of loose granules is normal • On aging shingles, missing granules indicate need for replacement |