Installing a chimney cap is not too hard and the tools needed are minimal. Most chimney caps are made to fit your chimney with four screws. You just put the cap on top and tighten the screws. However some chimneys are older and take a little more time to install a cap. For this project, we are putting a chimney cap made for modern homes on an old chimney. As you can see by the pictures below, this chimney doesn’t have much of a lip for the screws to hold the cap on tight.
Having a cap on your chimney is very important for two reasons. First, it stops animals from getting inside and causing an even bigger mess. Second, the cap protects the chimney and the pipes below from the weather, such as rain or snow. Which we know that this can cause rusting in whatever is below such as the furnace, water heater or boiler.
You can pick a cap up at your local hardware store for about $30-$50. You can even get more expenive ones if you have cash to burn. For my cap, I found this on craigslist for about $15. Apparently he tried to rig this up for his chimney and couldn’t get it to work, so he bought a different one. Since he drilled extra holes in the cap, he couldn’t return it.
Before you start, think safety. Make sure your ladder is set up properly, it’s not too windy out, your roof is free of hazards such as ice or tripping hazards. Even though this job really takes one person, it is a good idea to have someone around. That person can hold the ladder for you and just be a second set of eyes. If you fall off the roof or something else happens, they can assist in helping. Once you are comfortable and positive you have taken all the safety measures, you can begin work. Again, this how to is designed for the cap that will not install with the four screws that the manufacturer included. You will have to install this with L- brackets.
In reality, using the L-Bracket method, you really only need two screws if you have a tight fit. I used three because of my situtation.