How to Repair Chimney Caps | 5 Step Guide By Expert


Articles, products, and services offered on this site are for informational purposes only. We recommend using caution and seeking professional advice. This site provides general information. We are part of the Amazon Services LLC Associates Program, an affiliate advertising program. is compensated for sales resulting from links on our website.

Please review our disclaimer before taking action based on anything you read or see.

On one of those typical cold winter days, nothing is as inviting as a well-stocked fire over the hearth as a homeowner. However attractive this image is, did you know that the cosiest part of your home could also be the most dangerous? The steps on how to repair chimney caps are essential to keep both family and home safe and warm for many years.

More than a simple finish, the chimney cap constitutes real protection for the roof outlet. It preserves the chimney flue from various external aggressions such as rain or wind. The chimney cap prevents the risks of humidity and infiltration, which accelerate the chimney pipe’s corrosion. Even if this accessory is not legally compulsory for a wood stove or an insert, it is strongly recommended.

Why a Chimney Cap?

We are often far from imagining the number of risks incurred with an unprotected roof exit. And yet, without a hat, the roof exit is a wide-open path to various problems. To anticipate these inconveniences, it is better to install a chimney cap. It can play multiple roles:

Protect from bad weather

If the rain does not meet any obstacle, it can easily enter through the roof outlet and seep into the entire chimney flue. The chimney cap prevents this water ingress, preventing mould problems too. The chimney cap also acts as a barrier to strong winds in inclement weather, thus reducing weather variations on the quality of combustion.

Avoid the risk of fire. 

It happens that sparks from combustion emanate from the chimney flue and land directly on the roof. The cap stops these sparks and thus avoids any risk of fire starting.

Prevent back smoke

Thanks to the cap, the wind is deflected upwards, which prevents any return of smoke to the room in which the heater is installed. This prevents the inconvenience associated with it: blackening of the walls, unpleasant odour, and possible respiratory problems caused by the backflow of emissions.

Improve the draft 

The wind rushes into the hat and creates a depression, which improves the draft.

Avoid bird nests

The chimney flue constitutes a dream space for the nesting of storks. This unexpected takeover is not only dangerous for the birds but also complex for you. Once the nest is on your roof, you won’t be able to fix the problem so easily. Storks are a protected species; you will have to call in specialists. 

The place can also be attractive to other types of animals. You are not safe from finding an owl, a squirrel, or a raccoon stuck in your pipe without protection.

Other than animals, simple dead leaves or debris can get lodged in the chimney flue and obstruct it. The cap very avoids merely this kind of inconvenience.

Types of Cap: Choosing a Suitable Model

Before learning how to repair Chimney Caps, it’s best to learn about the different models, as each one has its specificities. Which choice to make also depends on your need? 

How to Repair Chimney Caps

Rain cap

As its name suggests, the rain cap – or rain cap – protects the chimney flue from rain and moisture. Its design is very simple: a metal disc placed on a support that fits over the duct or your chimney casing.

Meidinger cap

It is one of the best historic roof caps. Its shape is as simple as possible: a plate mounted on 4-foot support. This chimney cap owes its name to its inventor, the German physicist Heinrich Meidinger. It also offers good protection against rain and supports improved draft.  

Napoleon cap

This cap is particularly suitable for protection against rain and wind due to its surface being larger than the chimney’s opening. The Napoleon chimney cap’s practical option is the maintenance hatch, allowing the chimney sweep to perform the cleaning without removing the chimney cap. The name of this hat refers to its shape, echoing that of Napoleon’s bicornuate hat. It further offers good protection against snow or rain.

Extractor cap

Thanks to its shape, the smoke extractor cap uses the wind’s energy to optimize the heating installation draft.

Lamellar cap

The steel lamellar fabrication of this cap improves the heater draft while providing good weather protection. The removable cover makes cleaning easier while also offering good protection against rain and an improved draft.

How to Repair Chimney Caps

If your chimney cap has recently been damaged, you may be wondering how to fix it. While this task can intimidate home maintenance staff on the weekend, fixing a broken fireplace cap can be a very simple procedure, especially if approached with a complete set of instructions. So if you are looking to repair a damaged chimney cap, just read on to learn everything you will need to know.

Step-1: Tighten the chimney cap screws.

If the chimney cap just came off, use your screwdriver to tighten the screws that hold the device in place firmly. However, if the cap is held in place with adhesive, the problem can be solved with a simple new application of adhesive. Be sure to check your cap’s owner’s manual or the manufacturer’s website to determine the right type of adhesive for the job.

Step-2: caulk a leaky exhaust cap.

If water has leaked through the chimney cap, use the caulk and caulk applicator to repair the leak’s source. Again, before proceeding with this step, it is highly recommended that you consult your cap owner’s manual or manufacturer’s website to determine the proper type of caulking for the job. After letting the freshly applied putty have enough time to dry, your cap should not leak.

Step-3: Hammer off any dents

If your chimney cap is made of copper or steel, it can occasionally get dented. To fix this problem, use your hammer to tap off 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 the dented areas on your cap. However, if you are faced with a dent that encompasses the entire cap, it is generally recommended to carry out a chimney cap replacement.

Step- 4: get rid of damaged mortar.

If you have a mortar-based chimney cap, remove any damaged mortar with a cold chisel and hammer. After finishing and cleaning up any resulting residue, use your trowel to apply new mortar to the damaged areas. Before proceeding to the second phase of this step, be sure to check your cap owner’s manual or the manufacturer’s website to determine the correct type of mortar for the job.

Step-5: Clean your cap patch.

Smoke plugs generally feature a protective screen designed to prevent unwanted dirt and pests from reaching your fireplace. These screens will occasionally clog, thus reducing your chimney draft. If this occurs, use a small chimney brush to clean the cap with vigorous cleaning. Once the screen has been sufficiently cleaned, the clog’s source will be overcome, and your chimney draft should return to normal.

Frequently Asked Questions

How do you fix a chimney cap?

To fix a chimney cap, ensure it’s the same size as the mesh. Next, use your screwdriver to tighten the screws that hold the device in place firmly. However, if the cap is held in place with adhesive, the fixing can be done with a simple new application of adhesive.

Be sure to check your cap’s owner’s manual or the manufacturer’s website to determine the right type of adhesive for the job.

How much does it cost to fix a chimney cap?

Fixing a chimney cap ranges between $400 to $700.

How do you repair a concrete crown on a chimney?

Concrete chimney crowns are bonded to crack as the mortar displaces or breaks down over time. Cracks lead to leaks in your home, which leads to rot. Therefore, it is imperative to repair and seal these cracks before the worst happens. Sealing the chimney crown when the job is completed in the first place will not always do the trick. Plan to reseal the crown down the road, after a year or two has passed, and then as needed.

To do this, clean the chimney crown’s surface by brushing it with a bristle brush and water. Remove dirt, cobwebs, grime, and mould, if present.

Next, allow the surface to dry as recommended in fireplace paint sealer indications. Drying times can vary from one to five hours, depending on your climate and the amount of water used in the cleaning process.

After proper drying, open the chimney sealer’s container for painting by removing the lid and dipping the brush, covering the brush’s middle.

Next, apply the sealant to the crown of the fireplace with broad, overlapping strokes of paint. The point is to cover the whole with a thick layer of sealer. Finally, allow the sealer to dry and apply a second coat if deemed necessary and recommended by the manufacturer. Drying times vary, so check the product information for more specific drying times.

YouTube video


In conclusion, You might think of chimneys as just a small fireplace, but they have a lot of importance in a home. They serve as a way to burn fuelwood and heat your home during the winter and can be found in both traditional fireplaces and gas fireplaces. They are also commonly found on some gas ovens and fireplaces.

The appearance of the chimney cap is therefore not critical, but it is essential for its functionality. If the cap is damaged or cracked, it will not be able to support the weight of the firebox, and the fire will burn lower than normal, as highlighted above. Hope you learn how to repair chimney caps.

Read More: How To Cut Corrugated Plastic Roofing

Comments are closed.