\u00a9 2021 wikiHow, Inc. All rights reserved. Chimney caps must be slid over the chimney or into the flue. This cap can be poured in place or pre-casted but, should not physically touch the flue liner. This cap will actually fit around these brick snugly and you attach them with screws. You can either attach the bag to your shoulder or back while climbing the ladder or have someone attach a rope to it on the ground which they can then toss up to you when you’re up there so you can safely pull it up. [2] in diameter, so buy both size caps and return the unused one. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. The chimney cap is the cement covering surrounding the flue liner that terminates the brick and prevents water infiltration into a masonry chimney. The base of this cap is normally open, to accept one or multiple flues easily, but it can be customized to be completely closed off, except to allow flues (like a chase cover), allowing for maximum protection when needed. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. In this case, there are four screws that secure the top in place. If you don’t feel comfortable getting on your roof, hire a professional roofing company to install the cap for you. Then insert and tighten each Tapcon Masonry Fastener. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. I have a large masonry chimney that doesn't have a rain cap. You will need a concrete tip on your drill to ensure that your drill doesn’t get overworked or that the metal screws don’t break. 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