Rusting metal flashing details can often be painted with a high quality, exterior-rated metal paint to extend serviceable life and prevent further deterioration. If you see rusting flashing details atop your roof or around your chimney, I highly recommend painting to prevent further damage; replacement of deteriorated flashing details- especially around masonry fireplaces- can be costly. These pictures show rust presenting at one flashing detail, corrosion- and due for replacement- at another. This was discovered at a recent home inspection on Camano Island.
At a recent home inspection on San Juan Island, I discovered rusting/corroding flashing details at the chimney that should be further evaluated and repaired to help prevent potential leaks to the interior. Also, the installation of chimney caps is advised over open flues to prevent water intrusion which can reduce the life expectancy of masonry fireplaces. Finally, treating and removing organic growth from masonry is advised, together with applying a masonry sealant to properly maintain your exterior masonry elements.