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Chimney rain cap (C) Daniel FriedmanChimney Rain Cap & Chimney Cap/Crown FAQs
Q&A on Chimney Top Parts & their Definitions

  • POST a QUESTION or COMMENT about types of chimney rain caps & chimney caps / chimney crowns & their inspection, installation, troubleshooting & repair or replacement.

Chimney caps & crown & other top part definition FAQs.

This article series offers definitions of chimney rain cap or rain cover, chimney crown or top seal, chimney pot, and chimney shroud. Additional articles in this series describe inspection points, defects, and safety hazards concerning each of these chimney features.

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FAQs on Definitions of Chimney Rain Cap, Chimney Cap, Chimney Crown, Chimney Pot, Chimney Shroud

Questions & answers about proper names of and functions of the topmost components of a chimney.

[Click to enlarge any image] Photo provided by reader Bruce.

On 2019-04-27 by (mod) - what are the details for sealing the expansion gap around the top chimney flue tile?

Bruce

Please find your question and a detailed reply now found in

CHIMNEY CAP / CROWN CONSTRUCTION

On 2019-04-27 by Bruce - What about the material that is used to wrap around the flue?

Thanks.

What about the material that is used to wrap around the flue? See the attached photo. This is not my photo, but just an example. In the photo it looks like some type of insulation. I found some sill gasket foam, but not sure if that can be used.
Thanks again.

On 2019-01-13 by (mod) - Rain caps are recommended

Bill

Rain caps are recommended but I'm not sure you'll find that as an absolute requirement in your local building code, depending on the country and city where you live. It's certainly a question to ask your local building department, but I think it's maybe not the best use of your time and attention.

What's needed is an up close inspection of the chimney top chimney sides and chimney flashing as well as other areas of the roof or building to make sure that you have correctly identified the source of the leak. If it's a cap that would be great but it seems unlikely that I missing rain cap would explain everything that you've described.

On 2019-01-13 by Bill Dimkovski

we bought a new home from the original owner 2 years old.
we have water leaking on top of the gas direct vent fire place as well as water in the basement where there is a rough in for a fire place.

I just noticed that no rain cap has been installed on any of the homes in my area is this not part of the building code

On 2016-07-21 by (mod) - A proper rain cap does not interere with draft

I am stunned by your installer. A proper rain cap does not interere with draft and in fact improves it by preventing downdrafts in some wind conditions. Without a rain cap you risk flue damage and an unsafe chimney, potentially a fire hazard or a CO gas fatality.

On 2016-07-20 y Gary

We have a mason fireplace ( fire brick ) and the installer says not to use a rain cap because it affects the draft. Is it required?

On 2015-10-26 by Dave Mason

We've purchased an old house in Ohio. When it rains, we get flushing noises (like a toilet?) within the walls. Any idea what this is and is it normal?

On 2015-10-12 by (mod) - A proper rain cap does not interere with draft

You can close off an un-used flue but IMO to avoid possible condensation and subsequent damage, you want to be sure that there is no exterior water entering the flue and no Building air entering the flue - either of these can lead to hidden damage;

The choice of a closing cap depends on of what material the chimney is made; IMO for an existing metal flue that has an intact screen keeping animals out of the flue I'd leave it alone at the rooftop and simply seal the indoor opening into the flue with sheet metal, foil, caulk;

Watch out: BE SURE to clearly label the chimney as shut off with a sign that a future occupant will find before they try to re-use it: for return to service the entire chimney and all components will need to be reinspected.

On 2015-10-02 1 by Donna

We just had a new natural gas furnace and water heater installed which no longer use she chimney for exhaust. The installer said maybe we should cap the old chimney. Should this be done and how?

On 2015-09-26 by Anonymous

how much vent space between top of chimney and cap

On 2015-08-11 by (mod) -

You could indeed just install a rain cap atop the chimney, jamming the rain cap collar into the flue opening but it's a sloppy installation that may not produce proper draft and that might be more difficult to seal against leaks.

On 2015-08-11 by (mod) -


The proper repair would be to add a section of clay chimney liner inserted through the crown and mortared in place just atop the top edge of the currently too-short clay lining.

You could extend the reach of a chimney cap by attaching it to a stainless liner segment that in turn jams into the top of the clay flue liner, though I"m unclear about how that will be properly sealed in place against both draft leaks around the liner and water leaks down into the flue.

On 2015-08-11 by Dustin

I believe you miss understood me. I was simply stating that my chimneys clay liner doesn't exit the chimney. But that I am going to install a stainless steel liner for an insert,and the kit has a seal for the crown so basically the new liner is the only thing visible coming out of the top.

On 2015-08-09 by (mod) -

I agree that you may want to extend the chimney liner past the crown, but a wood insert? Really? This is a chimney. Spell FIRE.

I suggest asking for help from a certified chimney sweep / installer.

On 2015-08-09 by Dustin

Hello. My clay flue liner does not extend past the crown, in fact it's about 6" short looking into the chimney. Is that normal? I plan to install a wood insert and run a new ss liner and cap that and seal of the crown.

Question:

(Dec 3, 2014) Tony said:
We installed a triple walled metal chimney 12'run of pipe straight up from the top of our woodstove to 3' above the roof line. We burn our stove almost constantly at 250F-400F.We don't see any creosote buildup when inspecting and cleaning the chimney, but are plagued by soot collection in the top 3'-5' of the chimney.

There is no chase surrounding the exposed section of the chimney, would an insulated chase eliminate this problem? Or are there other solutions? I'm getting too old to keep climbing up on the roof all winter.

Reply:

Tony I'm not confident I can safely diagnose and recommend for this concern. Light soot from a woodstove at a chimney top may be ok but if soot blocks the cap, screen or flue there are indeed safety hazards. I agree that depending on the chimney height, enclosing the flue increases its temperature - but in wood burning I'm not sure what that does to soot at the cap.
I would feel that you are safest getting onsite advice from a certified chimney sweep. Do keep us posted.

Question:

(Feb 2, 2015) Eva said:
Do you need licence to produce Chimney caps in nyc?

Reply:

I'm not sure Eva, if you need a special license to produce chimney caps but selling them would be another question: certainly you'd need to get your chimney caps listed by UL or another accepted authority before they'd be code-approved and thus legal to install.

Question:

30 March 2015 chris said:
what is the minimum clearance between the top of the flue liner and the bottom of the chimney cap

Reply:

Chris this question was answered just below in a reply to ANON - thanks for asking, I'll also add that text to the article above.


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