The answer to 'my skylight is failing' is that the skylight may have reached the end of its lifespan or experienced damage, leading to leaks, drafts, or other issues. Common causes include worn seals, cracked glass, or deteriorating frames. Symptoms can include water stains, mold growth, and drafts around the skylight.
In many cases, skylight issues can be repaired by a professional roofer. This may involve replacing the seals, repairing the frame, or replacing the glass. However, if the skylight is old or significantly damaged, it may need to be replaced entirely. It's generally best to have a professional inspect the skylight and provide recommendations, as attempting DIY repairs could lead to further damage or safety issues.