Sealing a roof around a chimney effectively requires proper flashing integration and waterproof sealants to withstand harsh weather conditions. The process begins by inspecting and cleaning the entire junction where the roof meets the chimney. Install step flashing—individual L-shaped metal pieces woven between each course of roof shingles and turned up against the chimney walls—ensuring each piece overlaps the one below it by at least two inches. Over the top of the step flashing, install counter-flashing that is embedded into mortar joints in the brickwork and sealed tightly with exterior-grade masonry sealant to prevent water from running down behind the metal. Finally, inspect the chimney crown at the very top, ensuring it slopes downward away from the flue and overhangs the edges, sealing any hairline cracks with a flexible elastomeric coating to create a completely watertight roofing envelope.
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