perished roof sealant

https://waterproofingservicescapeplace.brightpathdigest.com/posts/why-reliable-waterproofing-services-in-cape-town-matter-for-your-roof

That perished roof sealant around the chimney was cracking and flaking off in chunks, letting water seep into the attic every time it rained. I spent a whole weekend scraping away the brittle black gunk before applying fresh sealant to stop the leaks.