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 Jason Your Own Question

Jason
Jason, Service Technician
Category: Electrical
Satisfied Customers: 3788
Experience:  Over 15 years of experience in all types of installations, troubleshooting, and repairs.
9920183
Type Your Electrical Question Here...
Jason is online now
A new question is answered every 9 seconds

I live in San Carlos, CA and have lived in my house for the

Resolved Question:

I live in San Carlos, CA and have lived in my house for the last 11 years. We haven't changed anything about the electrical and have had no issues at all. (house is 40 years old) Recently we had our roof redone and an insulation person mentioned that we should change out our insulation as it could affect our knob and tube wiring. The insulation
is the kind that is blown in (not the pink layered kind) Looking at a big expense and wanted to ask i this is a potential fire hazzard or problem with our current knob & tube wiring setup.

thanks!
Submitted: 1 year ago.
Category: Electrical
Expert:  Jason replied 1 year ago.

Jason :

Hello. Welcome to Just Answer.

Jason :

I have been doing electrical work full time for over 20 years, and I've crawled through many attics that had knob and tube wiring.

Jason :

I would estimate that more than 95% of those attics had blown in insulation as well.

Customer:

ok good

Jason :

It's very rare to find the pink bats of insulation anymore.

Customer:

from when I was a kid I guess :)

Customer:

so what do you think?

Jason :

I just don't see a reason to replace the insulation, as this is the first time I've ever heard anyone suggest this or mention it as a risk.

Customer:

does knob and tube wiring have some hidden risk if it's old that i don't know about?

Jason :

Knob and tube wiring has inherent risks, due to a few factors. I would be happy to list them for you.

Customer:

also, insulation laying on top of knob and tube is ok?

Customer:

that would be great

Jason :

I've never heard that it isn't. I've had to uncover many splices on knob and tube wiring that were buried under blown insulation. It's just expected now when I crawl into the attic of an older home to troubleshoot a problem.

Jason :

One risk of knob and tube is that it only has one layer of insulation over the copper conductor, wheres Romex type wire has two layers.

Jason :

Another risk is that the splices are never in junction boxes, so any arcing from loose connections would not be contained to a box.

Customer:

so what would you recommend as the best course of action. do nothing? let it be and call someone is there's a problem?

Jason :

Yes, that's how I would handle it.

Jason :

You're likely getting a better R-value from the blown insulation anyway.

Customer:

and what is an R-value?

Jason :

That is a number that correlates to the insulating capacity of the insulation... its ability to keep air that is at the desired temperature from leaving the living space, and air that is at an undesired temperature from entering the living space.

Jason, Service Technician
Category: Electrical
Satisfied Customers: 3788
Experience: Over 15 years of experience in all types of installations, troubleshooting, and repairs.
Jason and other Electrical Specialists are ready to help you
Expert:  Jason replied 1 year ago.
Our chat has ended, but you can still continue to ask me questions here until you are satisfied with your answer. Come back to this page to view our conversation and any other new information.

What happens now?

If you haven’t already done so, please rate your answer above. Or, you can reply to me using the box below.

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
  • 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
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Mike

    Master Electrician

    Satisfied Customers:

    1425
    Licensed Master Electrician - OnQ Certified Data Voice Audio Video Installer
< Last | Next >
  • http://ww2.justanswer.com/uploads/mikepettinato/2009-9-4_41145_DSC005132.jpg Mike's Avatar

    Mike

    Master Electrician

    Satisfied Customers:

    1425
    Licensed Master Electrician - OnQ Certified Data Voice Audio Video Installer
  • http://ww2.justanswer.com/uploads/WI/WireitUp/2012-6-17_18212_Photo00006.64x64.jpg Jason's Avatar

    Jason

    Service Technician

    Satisfied Customers:

    3278
    Over 15 years of experience in all types of installations, troubleshooting, and repairs.
  • http://ww2.justanswer.com/uploads/MI/MikeG2010/2012-6-7_192640_IMG01612.64x64.jpg Mike G.'s Avatar

    Mike G.

    Master Electrician

    Satisfied Customers:

    5318
    Proven Professional 45 years Experience
  • http://ww2.justanswer.com/uploads/AS/AssuredElectrical/2011-9-13_221243_me.64x64.gif AssuredElectrical's Avatar

    AssuredElectrical

    Master Electrician

    Satisfied Customers:

    2149
    Contractor-40 Years in the ElectricalTrade
  • http://ww2.justanswer.com/uploads/electrifier/2008-12-16_200429_headbob1.jpg electrifier's Avatar

    electrifier

    Master Electrician

    Satisfied Customers:

    1454
    Electrical contractor and electrical inspector for over 24 years with phone and networking expertise
  • http://ww2.justanswer.com/uploads/rich03dungo/2010-3-17_101556_tshirt2.jpg Rich's Avatar

    Rich

    Master Electrician

    Satisfied Customers:

    1115
    Over 35 years residential, commercial, industrial wiring, install, troubleshoot, service, maintain
  • http://ww2.justanswer.com/uploads/UR/urelectrician/2012-9-28_223652_JustAnswerPic.64x64.jpg Kevin's Avatar

    Kevin

    Licensed Electrician

    Satisfied Customers:

    993
    27 years as a Licensed Electrical Contractor in Illinois, 5 year college Electrical Instructor, Former Electrical Inspector, Diploma in Digital Electronics, Former Illinois Licensed Home Inspector
 
 
 
Chat Now With An Electrician
Jason
Jason
Electrician
3788 Satisfied Customers
Over 15 years of experience in all types of installations, troubleshooting, and repairs.