A rain collar is the flexible part of the pipe flashing (aka pipe jack) on your roof. Rain collars can be made from materials such as rubber, silicone, or Thermoplastic Elastomer (TPE). It's
very common for rain collars to fail before the shingles. You probably won't know when these leaks happen. The pipes tend to come straight up from inside the walls. This means if a pipe flashing goes bad, your leak will probably never go through your ceiling.
So when should you check the pipe flashing on your roof? First, if you are going to check them yourself, be very careful. Falling off or through a roof or off a ladder can break bones or cause death. You can call or text Divergent Roofing at 541-227-5552. We'll be glad to help you check, and if needed, replace the rain collars on your roof. It's a good idea to check the pipe jacks when they are about 10 years old. Check for obvious problems such as the one shown in the photo above. If the rain collar doesn't show an obvious need for replacement, push on it. You shouldn't see any cracks or sun damage, and it should be flexible.
If you need a new set of rain collars on your roof, do not attempt to repair them and don't let a roofer try either! Rain collars are manufactured to provide a tight seal and last years. Caulk or roof cement should only be used as a redundancy or backup for leak protection or as a glue, and if possible, should ideally be used where the sun can't reach it. Replacement rain collars can be found at roofing specialty suppliers, online, or at some home improvement stores. You can also call Divergent Roofing to do it for you. Replacing the rain collars on your roof is a quick and relatively inexpensive fix that will help save you the trouble of water damage.