How to install a chimney cap

 how to install chimney cap

On occassion homeowners will have to replace their chimney caps.  This most commonly results from the caps blowing off. The best option is hiring a professional chimney repair service.  Most companies include chimney cap installation as part of their available chimney repairs.  Using a professional installer provides the added benefit of discovering unknown problems at their early stages. However, some homeowners prefer to install the chimney cap themselves.  This article was created for those do-it-yourselfers who want to install their chimney caps.  Here you will find information that you need to know about how to install a chimney cap. 

There are several options available for replacing a chimney cap:

  • Fit over a flue
  • Friction fit
  • Multi Flue Cap

Fitting The Chimney Cap Over One Flue

The most common type of chimney cap is one that fits over a single flue. This doesn’t involve any tools special tools. However, it does require you to be on top of your roof.  Do not attempt to do this if you are not 100% comfortable with heights.  The single flue chimney cap should cover between one and three inches of the flue. There should also be at least five inches between the top of the chimney flue and the chimney cap lid so that there is proper air flow. Once the positioning is where it should be, the screws should be tightened from all sides.

Using a Chimney Cap with a Friction Fit

There are sometimes chimney caps that fit in with a friction fit.  Friction fits are common when there is a metal flue.  Using a chimney cap with a friction fit can be challenging.  As a result, it is best to have a chimney technician install it for you.  If you choose to do it yourself It is important to make sure that the cap you are installing has been approved for use on the chimney model.  Steer clear of parts that are not created by the original manufacturer.  If the original parts are not available, it is best to have a chimney expert.  The expert can use their knowledge to select the proper after market part.  

The cap should be placed firmly into the metal flue. From there, it is sealed into place with silicone sealer.

If there are two or more concentric pipes, also known as air-cooled flues, you will need a special type of chimney cap. This will allow the cooling air to flow sufficiently from pipe to pipe.  Once again make sure that you use caps from the caps manufacturer. 

Installing a Multi-flue Chimney Cap

The multi-flue cap is the most challenging type of cap.  Multi-flue caps are commonly found on masonry chimneys.  These caps extend across the entire chimney crown. This is different from a single flue cap which only covers the flue.  The cap can be anchored on top of the concrete crown.  They come in a variety of styles.  The challenge comes from the fact that proper installation requires the installer to put the cap into position, pre-drill holes in the concrete and then mount the cap.  If the holes are not drilled properly, the cap can blow off.  

There are many people who have attempted to install their chimney caps.  In some cases, it went well.  In others, the cap blew off, or the chimney experienced new damages.  There is a real benefit to hiring a professional.  Many homeowners choose to include chimney cap replacement in combination with a cleaning.  If you decide to do it yourself, it is important to consider all of the aspects of the job and be willing to call a technician to take care of it if you run into difficulty.  

Before you get started on any aspect of the installation, be sure you:

  • Take the time to identify the type of chimney cap you have
  • Identify the flue your chimney has
  • Use parts from the original manufacturer
  • Review any instructions that may have come from the manufacturer

Have all of the supplies you will need, which should be minimal regardless of what kind of cap you have. Then, follow the instructions and your cap will be in place in no time at a

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