What is a chimney cap?

Chimney caps not only protect the inside of your chimney but are also designed to protect the mortar crown area at the top of the chimney.

Why do I need a chimney cap? The most important reason for capping your chimney is to protect the inside of your chimney from water which can lead to moisture damage.

Capping your chimney will reduce the risk of burning embers or sparks from escaping the open chimney top and landing on your roof or in your yard.

An uncapped chimney is an open invitation to birds and animals to “nest” inside your flue. These “nests” block your chimney flue and can result in a chimney fire.

Debris, such as tree branches and leaves can enter and accumulate in a chimney flue, which of course can be a potential fire hazard and minimize draft.  A chimney cap will greatly decrease the possibility of such debris collecting inside your chimney flue.

* A little note/reminder.  As the leaves fall from the trees near your home, they can accumulate on your roof and even if you do have a chimney cap, they can collect around the base of the cap at the chimney crown and even stick to the mesh walls of your cap.  Be sure to clear your chimney, chimney crown, chimney cap, and of course your roof of leaves, branches, and any other debris before using your chimney to vent your heating unit(s).  AND BE CAREFUL... moisture can collect underneath leaves, making the leaves' under-surface slimy and very slippery.  This can be a very dangerous surface to walk on - especially when the surface is at an angle (like a roof).  Even if the leaves appear to be dry, they may only be dry on the top, not the under-surface.

My Flue is Detoriated, What Do I Do?


Flue Stretcher Cap
When you have two flues in one chimney and one pulls the exhaust from the other, what do you do?

Well, one quick and easy solution is to use a Flue Stretcher Cap. They come in sizes of 1' or 2'. They simply allow you to in effect stretch one flue above the other far enough to prevent the cross over of flue gases. Flue stretchers come in both stainless steel and copper and will fit all the common sizes of flues. It's simple, it's easy, and it works.

By increasing the effective height of the flue the flue stretcher cap solves two problems.

  • Negative house pressure can pull the smoke from one flue down another flue right beside it. Adding the flue stretcher to the upstairs flue distances its smoke from the downward pull of the downstairs flue.
  • By putting the flue opening above roofs and other nearby structures you will improve draft and reduce down drafts.

How do I determine what kind of cap I need?Caps for chimneys come in many different styles and sizes. To determine what style is best for your application you will first need to know what kind of chimney you have.

If you have a masonry chimney determine next if you have a single flue or a multiple flue.

If you have a single clay liner sticking out of your masonry chimney, measure the top of the clay liner. These dimensions will determine what size cap will be needed.

If you have multiple clay liners or no liner at all, determine the dimensions for a multi-flue cap.

How to measure for a multi flue cap

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