Once a skylight is installed, it may be difficult to recognize if the installation was done properly. Here are a few signs that there could be trouble.
- Mastic or Sealant (roofing tar) has been used to seal the skylight. Good skylight flashing should shed water and does not require mastic. Mastic on the flashing is a sign of trouble.
- If a skylight is installed too close to a plumbing stack or some other roof penetration or intersection (less than 18 inches) it is very difficult to flash properly. Room is needed around the skylight for the flashing components.
- Moisture or stains on the inside could be evidence of a leak or could be condensation. Sometimes it's a hard to determine what you are looking at.
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