How to Repair a Broken Flue Cap How to Repair a Broken Flue Cap

What You'll Need
Caulk applicator
Pair of pliers
Cold chisel
Chimney brush

If your flue cap has recently sustained damage, you may be wondering how to go about fixing it. While this task may intimidate the weekend household handyman, fixing a broken flue cap can be a very simple procedure, especially if tackled with a thorough set of instructions. So if you're looking to repair a damaged flue cap, simply read on to learn everything you'll need to know.

Step 1 - Tighten Your Flue Cap's Screws

If your flue cap has simply come loose, use your screwdriver to securely tighten the screws that hold the device in place. If your cap is held in place with adhesive, however, the problem can be solved with a simple reapplication of adhesive. Be sure to consult your cap's owner's manual or the manufacturer's website to determine the proper type of adhesive for the job.

Step 2 - Caulk a Leaky Flue Cap

If water has been leaking in through your flue cap, use your caulk and caulk applicator to patch the source of the leak. Once again, before proceeding with this step, it is strongly advised that you consult your cap's owner's manual or the manufacturer's website to determine the proper type of caulk for the job. After giving the freshly-applied caulk ample time to dry, your cap should be free of leaks.

Step 3 - Hammer Out any Dents

If your flue cap is composed of copper or steel, it may occasionally incur dents. To remedy this problem, use your hammer to gently pound out any dents and restore your cap to its original shape. Alternatively, if the dents are relatively small, you can use a pair of pliers to straighten out your cap's dented areas. However, if you're faced with a dent that encompasses the entire cap, it is generally recommended that you replace the cap.

Step 4 - Get Rid of Damaged Mortar

If you own a mortar-based flue cap, get rid of any damaged portions of mortar with the aid of a cold chisel and a hammer. After finishing up and clearing away any resulting debris, use your trowel to apply new mortar to the damaged areas. Before proceeding with the second phase of this step, be sure to consult your cap's owner's manual or the manufacturer's website to determine the right type of mortar for the job.

Step 5 - Clean Your Cap's Screening

Flue caps generally feature a protective screening designed to keep dirt and unwanted pests from finding their way into your chimney. These screens will occasionally become clogged, thus reducing your chimney's draft. Should this occur, use a small chimney brush to give your cap's screening a vigorous cleaning. Once the screening has been sufficiently cleaned, the source of the clog will be vanquished and your chimney's draft should return to normal.

And there you have it. When repairing a broken flue cap, just remember these five steps and you'll have your cap in working order in no time.

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