New poster here – I am the first to admit I am not a “handy” person. I recently entered into contract on a home with a slate roof, and was surprised to find multiple strips of (tar?) adhesive at the ridge along many tiles. The inspector stated that this was likely due to a prior leak, but couldn’t comment much more than that. Photos attached.
I am trying to understand: 1. What exactly the purpose of adhesive at the roof ridge is? 2. Whether I need to replace/repair this or do anything else? and 3. What the cost would be to do so?
Thank you all so much for your help!