How To Make a Chimney Cap?

How To Make A Chimney Cap

If you want to learn about how to make a chimney cap, you’ve come to the right place! In this guide, we’ll cover everything from materials needed, measurements and tips on how to make your own chimney cap.

Purpose of Chimney Caps

Before we dive into the steps of making a chimney cap, let’s first understand its purpose. A chimney cap is a protective covering or enclosure that is placed on top of chimneys to prevent rain, snow, debris and animals from entering. It also helps contain sparks and embers from escaping and potentially causing fire hazards.

How To Make A Chimney Cap

Different Types of Chimney Caps

There are various types of chimney caps available in the market, but the most common ones are made from metal such as stainless steel, copper or aluminum. Chimney caps can also be made from other materials like clay, terracotta or even concrete. Each type offers its own unique benefits and aesthetics.

Chimney Caps Include:

  • ol]:!pt-0 [&>ol]:!pb-0 [&>ul]:!pt-0 [&>ul]:!pb-0″ value=”2″>Multi-Flue
  • ol]:!pt-0 [&>ol]:!pb-0 [&>ul]:!pt-0 [&>ul]:!pb-0″ value=”4″>Wind Directional
  • Single Flue Cap

    This type of chimney cap is the most common and is designed to cover a single flue. It’s usually made from stainless steel or copper and comes in different shapes such as square, rectangle or round.

    Single Flue Cap Chimney
Multi Flue Cap Chimney

Multi-Flue Cap

As the name suggests, this type of chimney cap can cover multiple flues at once. It’s often used for chimneys with more than one flue or in cases where multiple chimneys are close together.

Top Mount Cap

Top mount chimney caps sit on top of the chimney and are secured with screws. They provide protection for both single and multi-flue chimneys and can also improve draft and prevent downdrafts.

Top Mount Cap Chimney
Wind Directional Cap Chimney

Wind Directional Cap

This type of chimney cap is designed to rotate and change direction with the wind. It helps prevent downdrafts and keeps smoke from entering your home.

Decorative Cap

For those looking for something more aesthetically pleasing, decorative chimney caps offer both protection and style. These caps come in various designs and materials, adding a unique touch to your chimney.

Chimney Decorative Cap

Benefits of Installing a Chimney Cap

Aside from preventing debris and animals from entering your chimney, there are several benefits to installing a chimney cap:

  • Protection against moisture: A properly installed chimney cap can prevent rain, snow and other forms of precipitation from entering your chimney. This helps protect your chimney and fireplace from water damage.
  • Improved draft: A good chimney cap can improve the draft in your chimney by creating a slight vacuum effect, allowing smoke and gases to flow up and out more easily.
  • Prevents downdrafts: Wind can cause downdrafts in your chimney, resulting in smoke being blown back into your home. A chimney cap acts as a barrier against strong gusts of wind, preventing this from happening.
  • Longer chimney lifespan: By keeping debris and moisture out, a chimney cap can help extend the lifespan of your chimney. Without a cap, debris and moisture can cause damage to your chimney’s structure over time.
  • Energy savings: By improving draft and preventing downdrafts, a chimney cap can also contribute to energy savings by allowing your fireplace to function more efficiently.

Materials Needed

  • Sheet metal (preferably aluminum or copper)
  • Snips
  • Measuring tape
  • Rivet gun and rivets
  • Drill with bits
  • Pliers
  • Safety goggles
  • Gloves


Before you begin, it’s important to accurately measure your chimney. Measure the width and length of the top of your chimney, as well as the height from the roof to the top of the chimney. We recommend adding an extra inch to each measurement for a snug fit.

Step-by-Step Guide to Making a Chimney Cap

Step 1: Cut the sheet metal

Using your measurements, cut a piece of sheet metal to size using snips. Be sure to wear safety goggles and gloves while cutting.

Step 2: Form the cap

Fold the sheet metal into a U-shape, with the two ends overlapping slightly to create a seam.

Step 3: Rivet the seam

Using a rivet gun and rivets, secure the overlapping ends of the sheet metal together. This ensures that your cap will stay in place on top of your chimney.

Step 4: Drill holes for ventilation

To prevent moisture from getting trapped inside the cap, drill small holes along the sides of the cap for ventilation.

Step 5: Attach the cap to the chimney

Place the chimney cap on top of your chimney. If needed, use pliers to adjust the fit. Once in place, secure the cap by drilling screws into the sides and bottom of the chimney.

Step 6: Seal any gaps

Using a waterproof sealant, caulk any gaps between the cap and chimney to prevent moisture from entering.

Step 7: Regular maintenance

Inspect and clean your chimney cap regularly to ensure it is functioning properly. Remove any debris or buildup that may have accumulated on top of the cap.


  • Make sure to wear protective gear while working with sheet metal, as it can be sharp.
  • Use aluminum or copper for a durable and rust-resistant chimney cap.
  • Consider adding mesh on top of the sheet metal to prevent debris and animals from entering the chimney.
  • Regularly clean and inspect the chimney cap to ensure it is still in good condition and functioning properly.

How To Make a Chimney Cap FAQs

While rivets are the most secure option, you can also use self-tapping screws to attach the overlapping ends of the sheet metal together.

It is recommended to clean and inspect your chimney cap at least once a year. However, if you notice any blockages or damage, it is important to clean and inspect it more frequently.

Yes, there are many options available for store-bought chimney caps. However, making your own can be a cost-effective and customizable option.


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