Cracked Chimney - Masonry - Contractor Talk

Cracked Chimney

 
Thread Tools Search this Thread Display Modes
Old 01-11-2019, 01:34 PM   #1
Registered User
 
Scuba diver's Avatar
 
Trade: Mason
Join Date: Jan 2019
Posts: 6

Cracked Chimney


Hi all
I have recently finished an outdoor fireplace, gas fired. Not sure if the owner is lighting on low or straight to high. This burner is 180000 btu's chimney is red brick with a two coat stucco system. It has precast concrete face(haddonstone product).from top of firebox chimney is 6'tall, cap stones are about 6" above flue liner. Problem occurred shortly after the owner stsrted using it. It cracked from tge face stones to the top. Any ideas on why?
Attached Thumbnails
Cracked chimney-screenshot_20190104-142919_gallery_1547231688084.jpg  
Scuba diver is offline  

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ContractorTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

   

Advertisement

 

Old 01-11-2019, 01:45 PM   #2
Registered User
 
Scuba diver's Avatar
 
Trade: Mason
Join Date: Jan 2019
Posts: 6

Re: Cracked Chimney


Trying to figure out if ignited on high would crack it, by not allowing the unit to warm up slowly

Advertisement

Scuba diver is offline  
Old 01-11-2019, 07:22 PM   #3
Pro
 
fjn's Avatar
 
Trade: mason
Join Date: Aug 2011
Posts: 4,975
Rewards Points: 10,498

Re: Cracked Chimney


Was a 1" air space maintained between flue liner and surrounding masonry ? Flue liners when heated, expand both in width and height. That expansion can exert stresses and crack both the liner and masonry.
fjn is online now  
The Following User Says Thank You to fjn For This Useful Post:
Fouthgeneration (01-12-2019)
Sponsored Links
Advertisement
 
Old 01-11-2019, 08:51 PM   #4
Registered User
 
Scuba diver's Avatar
 
Trade: Mason
Join Date: Jan 2019
Posts: 6

Re: Cracked Chimney


There was a gap maintained until the last few crs. of brick, i also had not noticed a crack in the liner but will take a closer look
Scuba diver is offline  
Old 01-12-2019, 05:19 AM   #5
Pro
 
Fouthgeneration's Avatar
 
Trade: Masonry
Join Date: Jan 2014
Location: Mid west
Posts: 2,266
Rewards Points: 8,081

Re: Cracked Chimney


The good news this isn't inside a 500,000.00$ home waiting to cause a fire....

No scaffold needed to tear it apart....

I suggest you find a competent fire place builder to teach you how, for either direct payments or some sort of labor exchange for schooling in safe to use fireplace construction techniques.

Some studying on line and at a library might help some.

Pretty Fire place, Where is the roof to keep it BONE dry?

In Argentina, in the Pampas? ranch land, the out of doors cow cookers/summer time kitchens have ROOFS, but the walls are rolled up tarps, thus allowing the fire places to survive several winters.....

Even a properly built fire place will explode/suffer damage if it is hot fired when wet or damp.
__________________
I might be an Idiot, but I know things that You don't: Please wait till after you get my know-how to insult me....

Last edited by Fouthgeneration; 01-12-2019 at 05:23 AM.
Fouthgeneration is online now  
Old 01-18-2019, 05:11 PM   #6
Pro
 
JBM's Avatar
 
Trade: Masonry
Join Date: Mar 2011
Location: Mass.
Posts: 7,602
Rewards Points: 8,916

Re: Cracked Chimney


How did you build the smoke chamber, did it have it's own walls behind the outside masonry?

There isn't a damper right?
JBM is offline  
Old 01-18-2019, 05:14 PM   #7
Pro
 
JBM's Avatar
 
Trade: Masonry
Join Date: Mar 2011
Location: Mass.
Posts: 7,602
Rewards Points: 8,916

Re: Cracked Chimney


Quote:
Originally Posted by Fouthgeneration View Post

Even a properly built fire place will explode/suffer damage if it is hot fired when wet or damp.
I had a small bit of puddling at the joint where the bluestone met the fire brick. A chunk of the bluestone exploded!
JBM is offline  
Old 01-19-2019, 08:58 AM   #8
Stonemason
 
bytor's Avatar
 
Trade: masonry
Join Date: Jan 2010
Location: Ontario
Posts: 639
Rewards Points: 616

Re: Cracked Chimney


Any angle irons in there which lack room for expansion? It's amazing how much lateral pressure expanding metal can exert... Dampers included.
bytor is offline  
Old 01-19-2019, 07:35 PM   #9
Pro
 
Fouthgeneration's Avatar
 
Trade: Masonry
Join Date: Jan 2014
Location: Mid west
Posts: 2,266
Rewards Points: 8,081

Re: Cracked Chimney


bytor, I'll use some rolled up fiberglass to form a cavity for the steel and iron embeds to grow into , instead of 'jacking' the masonry apart.

the flues need to able to move up to 2" vertically on a 2 story home during a chimney fire.


I like using stainless steel positioners cut out of 18-20 gauge stock that allow the flue to move up and down and grow some what around during fireplace/furnace use.

The flue needs a soft sliding joint around the cap, especially with poured caps, I have repaired several that had the cap elevated by thermal expansion of the flues.
__________________
I might be an Idiot, but I know things that You don't: Please wait till after you get my know-how to insult me....
Fouthgeneration is online now  
The Following User Says Thank You to Fouthgeneration For This Useful Post:
fjn (01-20-2019)
Old 01-19-2019, 09:22 PM   #10
Pro
 
JBM's Avatar
 
Trade: Masonry
Join Date: Mar 2011
Location: Mass.
Posts: 7,602
Rewards Points: 8,916

Re: Cracked Chimney


Another non returning poster, building something wrong...
JBM is offline  
Old 01-20-2019, 12:48 PM   #11
Pro
 
fjn's Avatar
 
Trade: mason
Join Date: Aug 2011
Posts: 4,975
Rewards Points: 10,498

Re: Cracked Chimney


Quote:
Originally Posted by Fouthgeneration View Post

The flue needs a soft sliding joint around the cap, especially with poured caps, I have repaired several that had the cap elevated by thermal expansion of the flues.


Yup ! Like depicted here.

https://masonryadvisorycouncil.org/w...nstruction.pdf
fjn is online now  
Old 01-20-2019, 04:17 PM   #12
Pro
 
Windycity's Avatar
 
Trade: Masonry
Join Date: Oct 2015
Location: chicago
Posts: 2,005
Rewards Points: 7,970

Re: Cracked Chimney


Quote:
Originally Posted by JBM View Post
Another non returning poster, building something wrong...


LOL

In the description it says that he is a mason


Sent from my iPhone using Tapatalk
Windycity is online now  
The Following User Says Thank You to Windycity For This Useful Post:
JBM (01-20-2019)
Old 01-20-2019, 10:05 PM   #13
Registered User
 
Scuba diver's Avatar
 
Trade: Mason
Join Date: Jan 2019
Posts: 6

Re: Cracked Chimney


This was built to architect specs, i thought this was a place of professionals not sarcastic dimwits
Scuba diver is offline  
Old 01-20-2019, 10:18 PM   #14
Capra aegagrus

 
Tinstaafl's Avatar
 
Trade: Remodeler
Join Date: Jan 2008
Location: Central Pennsylvania
Posts: 23,117
Rewards Points: 1,259

Re: Cracked Chimney


Maybe you didn't notice the disclaimer on the architect's drawings? He takes no responsibility; you, as the builder, carry the burden of making his pretty design actually work.

These "dimwits" have been down that road many times. Stick around, you may learn a thing or three.
Tinstaafl is online now  
Old 01-21-2019, 06:25 PM   #15
Pro
 
Fouthgeneration's Avatar
 
Trade: Masonry
Join Date: Jan 2014
Location: Mid west
Posts: 2,266
Rewards Points: 8,081

Re: Cracked Chimney


OPer= "And He Built a Crooked house....."
R.A. Heinlein



Nehemiah 2:17-18
Then I said to them, "You see the bad situation we are in, that Jerusalem is desolate and its gates burned by fire. Come, let us rebuild the wall of Jerusalem so that we will no longer be a reproach." I told them how the hand of my God had been favorable to me and also about the king's words which he had spoken to me. Then they said, "Let us arise and build." So they put their hands to the good work.

Next time read the directions, then put it together....

Have you ever seen a twenty year old roofless fireplace that STILL WORKED???? Where it rains every few years?


See ASTM C 1283 v2015...
__________________
I might be an Idiot, but I know things that You don't: Please wait till after you get my know-how to insult me....

Last edited by Fouthgeneration; 01-21-2019 at 06:55 PM.
Fouthgeneration is online now  
Old 01-21-2019, 06:32 PM   #16
Renaissance Man
 
superseal's Avatar
 
Trade: Masonry, Carpentry and everything else.
Join Date: Feb 2009
Location: Southeastern PA
Posts: 6,802
Rewards Points: 5,810

Re: Cracked Chimney


For sure the damage looks heat induced..as in very high heat. 180,000 btu's will heat a friggin' 2500+ sq ft house...is this not a typo? If you're indeed correct with the size of this unit and your customer fired full steam...and perhaps the fireplace was soaked through...more than likely, as it's been a very wet year for many, you're lucky chunks of it aren't laying in the neighbors yard And, as mentioned by other dimwits, any steel e.g dampers, lintels, reinforcement will expand and cause stresses.

I'm leaning towards a very wet high fire...the design may be purrty to look at, but with that graceful swale of the throat and flue section and the ledges present, that baby is inhaling some serious H2O.

The mason in you can surely attest that adding water is the trigger for flaming bluestone with high heat...it won't quite pop without it...
__________________
"Under promise, over deliver and all that!" JBM
supersealconstruction.com

https://www.facebook.com/Superseal-C...2699413750013/
superseal is online now  
Old 01-21-2019, 08:33 PM   #17
Pro
 
Fouthgeneration's Avatar
 
Trade: Masonry
Join Date: Jan 2014
Location: Mid west
Posts: 2,266
Rewards Points: 8,081

Re: Cracked Chimney


Remember the first piece of clay you fired that wasn't oven dry? it exploded and broke five of your classmates projects in the kiln....

Did you install a damp proof flashing/vapor barrier course under the fireplace???
__________________
I might be an Idiot, but I know things that You don't: Please wait till after you get my know-how to insult me....

Last edited by Fouthgeneration; 01-21-2019 at 09:15 PM.
Fouthgeneration is online now  
Old 01-22-2019, 10:24 PM   #18
Pro
 
JBM's Avatar
 
Trade: Masonry
Join Date: Mar 2011
Location: Mass.
Posts: 7,602
Rewards Points: 8,916

Re: Cracked Chimney


If you have progress photos we can iron this out.
JBM is offline  
Old 01-23-2019, 08:33 AM   #19
Registered User
 
Scuba diver's Avatar
 
Trade: Mason
Join Date: Jan 2019
Posts: 6

Re: Cracked Chimney


I have no in-progress photos
Scuba diver is offline  
Old 01-23-2019, 08:37 AM   #20
Registered User
 
Scuba diver's Avatar
 
Trade: Mason
Join Date: Jan 2019
Posts: 6

Re: Cracked Chimney


There is no damper, one angle iron 12" above opening with plenty of room for lateral expansion, the crack seems to start at the top.
There is a cap to keep rain, snow and ice out

Advertisement

Scuba diver is offline  



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Flashing a stone veneer chimney. PatChap Roofing 7 04-02-2013 12:19 PM
joint cracked twice in a week r4r&r Drywall 9 06-29-2012 09:08 PM
Adding a new chimney on an existing house Desdevinc Masonry 7 03-20-2011 11:14 AM
Flue cap GettingBy HVAC 11 02-14-2011 04:46 PM
Dangerous Chimney Dilemna The Boss Masonry 27 04-25-2009 08:35 PM

Join Now... It's Fast and FREE!

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for
PROFESSIONAL CONTRACTORS ONLY!

At DrywallTalk.com we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created www.DIYChatroom.com DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?