How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Robert B Your Own Question

Robert B
Robert B, General Contractor
Category: Home Improvement
Satisfied Customers: 12
Experience:  20 years in commercial general contracting plus numerous home improvement projects
Type Your Home Improvement Question Here...
Robert B is online now
A new question is answered every 9 seconds

I just noticed that I have a crack in my chimney masonary thimble.

Resolved Question:

I just noticed that I have a crack in my chimney masonary thimble. It is an 8" thimble, but my stove has 6" outlet. Can I insert some sort of smaller thimble/pipe as a substitute? Can they be repaired without tearing out the old thimble. Is there any type of caulking type material that can be put into the crack? Sources of such materials?
Submitted: 5 years ago.
Category: Home Improvement
Expert:  Robert B replied 5 years ago.
Hmmm, this is a tough one. I presume the thimble connects to a metal chimney that goes up and out and that you are concerned about smoke or a spark getting into the masonry chimney. Do I have this right?
Customer: replied 5 years ago.
It is a masonry/ceramic thimble that goes through a garage wall to a masonry chimney. The crack is where it goes through the garage inside wall into the outside chimney (of block with ceramic liner). The Thimble has an 8.125" inside diameter and is about 12" long. I really think that I ought to be able to insert a smaller thimble within the larger thimble, but I don't know. THe stove I use has an 6" outlet, so there is no practical reason I can think of that it must be 8" at the chimney. For the stove hookup, I use 6" all the way then had a 6" to 8" adapter that slid into the end of the thimble.
Customer: replied 5 years ago.
graphic
Expert:  Robert B replied 5 years ago.

I agree. My only concern is if the crack opens into the garage wall cavity you could have a problem. Is there a way to make a tight mechanical connection between your new thimble and the masonry chimney? You don't want any backdraft to cause a fire in your wall.

 

One idea would be to seal the crack with Dap High Heat Mortar caulk #18854 available at www.doitbest.com. After doing this you may or may decide that it's unnecessary to install the new thimble.

 

Good luck with this and let me know if I can be of more help or if this didn't answer your question.

 

Thank you for using justanswer.

 

Robert

Robert B, General Contractor
Category: Home Improvement
Satisfied Customers: 12
Experience: 20 years in commercial general contracting plus numerous home improvement projects
Robert B and 4 other Home Improvement Specialists are ready to help you

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
< Last | Next >
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
  • Thank you for the expeditious answer. It's good to know you're out there and awake in the wee hours when I finally have time to ask questions about my Jenn Air. Jean Riverhead, NY
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
 
 
 

Meet The Experts:

 
 
 
  • The Home Smithy

    Home Builder

    Satisfied Customers:

    2002
    #1 Home Improvement Expert 30+ years experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/TH/TheHomeSmithy/2011-8-13_11146_homesmithy.500x500.64x64.jpg The Home Smithy's Avatar

    The Home Smithy

    Home Builder

    Satisfied Customers:

    2002
    #1 Home Improvement Expert 30+ years experience
  • http://ww2.justanswer.com/uploads/BS/bshull17/2011-2-11_04125_japic.64x64.JPG Brian's Avatar

    Brian

    Architect

    Satisfied Customers:

    1967
    Licensed Architect- 16 years, L.E.E.D. AP
  • http://ww2.justanswer.com/uploads/ST/Steve555/2013-6-14_144343_Depositphotos4247517S.64x64.jpg Steve G.'s Avatar

    Steve G.

    Handyman

    Satisfied Customers:

    135
    VP of electronic repair company and home theater advisor.
  • http://ww2.justanswer.com/uploads/ER/Erdaram/2011-6-21_14724_ANIEric4Pics.64x64.gif Eric M. Bright's Avatar

    Eric M. Bright

    We Don't Comprehend the Word Can't!

    Satisfied Customers:

    1734
    I've been been doing things for my clients that others have said cant be done for over a 1/4 Century
  • http://ww2.justanswer.com/uploads/rich03dungo/2010-3-17_101556_tshirt2.jpg Rich's Avatar

    Rich

    Home Improvement Enthusiast

    Satisfied Customers:

    674
    Over 35 years construction and home maintenance experience
  • http://ww2.justanswer.com/uploads/AL/alumalite/2012-5-10_234018_shutterstock506249951forJA500.64x64.jpg Phil's Avatar

    Phil

    Mechanical Engineer

    Satisfied Customers:

    409
    Retired contractor, 51 years experience
  • http://ww2.justanswer.com/uploads/JE/jerrymassie/2011-1-15_45937_1111055.64x64.JPG Jerry's Avatar

    Jerry

    hearth products

    Satisfied Customers:

    317
    owned and operated stove retail and service 12 yrs