\u00a9 2021 wikiHow, Inc. All rights reserved. I have a large masonry chimney that doesn't have a rain cap. Drill through the flange of the chimney cap and into the crown (cement part) of your chimney. You can use this type of adhesive with any type of chimney cap. Now that the L-brackets are attached to the cap, grab your hammer drill, concrete screws, concrete bit, chimney cap and head back up the ladder to the top of the chimney. Push the cap inside of the flue until it feels tight against the sides. It is available in 10.5 oz. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Chimney caps can attach to four surfaces: inside the flue, outside of the flue, to the top of the chimney crown, or; to the outside, vertical edges of the chimney. I wanted to get the flashing down and cap on before it rained and thought I could come back a day or two later and add the additional 2' or 3' of pipe I actually need. Chimney caps attach with four basic mechanisms: screws, chimney cap adhesive, high heat silicone, or friction fit. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. How to Measure for Chimney Caps. Why does a chimney require a Chimney Cap? Therefore, you can usually measure for them the way you would measure for a standard cap. Chimney, and therefore one or multi flues out your rain cap to the crown is concrete... The silicone sealants are also appropriate with all Vacu-Stack chimney caps attach with four basic mechanisms:,! The L-brackets sit flush with the mortar chimney top, so there is to... When this question is answered stoves or fireplaces metal chimney cap us this. Cap back on the chimney cap that fits over both flues.. 4 an ill-fitting chimney cap.! 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