CALL NOW : 425-516-1055


CALL NOW : 425-516-1055

Knob and Tube Rewiring

Does Your Home Still Have Knob & Tube Wiring?

Knob and tube wiring was a popular form of electrical wiring used between 1880 and the late 1940s throughout homes in the United States. It’s easily identified by its trademark white, ceramic knobs that resemble spools of thread. 

This wiring can last up to 100 years, but that doesn’t mean you should keep decades-old knob and tube wiring. With the increased energy demands and the high risk of electrical fire and shock, you should definitely replace knob and tube wiring if it’s the type of electrical system in your home.

If you believe that your knob and tube wiring needs replacement, or if you would like it inspected, contact Attic Projects today.


Fill out the form or give us a call at 425.516.1055

*Our in-house inspectors will provide you a detailed inspection report so we understand exactly what needs to be done, to take you where you want to be. Make sense?

    The Hazards and Safety Considerations for K&T Wiring

    You won’t find knob and tube wiring in modern homes. Although not inherently dangerous, this type of wiring can become problematic as the insulation begins to deteriorate with age. For this reason, knob and tube wiring should never be run through insulation. 

    In fact, no wiring should be surrounded by insulation since it can create a fire hazard if the wires begin to overheat. Wiring in your home should instead be “open wiring,” which emphasizes the need to have open airspace around your wiring at all times. 

    Here is a list of other safety considerations for knob and tube wiring: 

    • Does not include safety ground conductor
    • Higher risk of electrical shock that could cause injury or death
    • No junction box
    • Bad with moisture
    • Can easily become hidden under the insulation

    Having knob and tube wiring in your home doesn’t necessarily mean that your property is at immediate risk of catching on fire. But it does mean that your electrical system should be regularly inspected to ensure that wiring is not worn, corroded, or damaged in any way. You should also keep in mind that having K&T wiring may make it difficult to obtain home insurance.

    Other K&T Wiring Issues You May Be Facing

    Wear and Tear on Insulation

    K&T wiring uses a rubber/cloth insulation. Over time, this type of insulation may become brittle and start to crack and flake. If insulation is installed over the knob and tube wiring, this can create a significant fire hazard, should the wires become overheated.

    Limited Power Capability

    Knob and tube wiring was installed at a time when people used fewer appliances in their homes. Today, these old systems cannot keep up with the modern world’s demands and can become easily overheated.

    Fewer Circuits

    Most existing knob and tube installations have fewer branch circuits than what is used today. This leaves electrical systems subject to higher levels of current and increases the risk of heat damage or fire.

    Susceptible to Damage

    General wear and or other issues can create serious problems for your K&T wiring. As it ages, the porcelain knobs and tubes can crack, and the wires may begin to fray.

    Unprofessional / Improper Modifications

    Home handymen are usually not professionally trained on working with K&T wiring and may inadvertently create a hazardous situation while attempting to upgrade the wiring.

    Hard to Maintain 

    Knob and tube wiring is vulnerable to mechanical damage and should only be handled by a professional.

    How to Identify K&T Wiring

    Knob and tube wiring can be found in the basement or attic of older homes. You can quickly identify it by its white, ceramic knobs and tubes that look similar to spools of thread. Electrical wiring is looped throughout the knobs, and the heavy ceramic tubes secure the wires where they run through the joists.

    It’s important to note that just because you don’t see knob and tube wiring doesn’t mean it isn’t there. That’s because the wiring is often found behind the walls of homes. This is usually something that was done by previous homeowners (intentionally or unintentionally), using a concept known as “spider-webbing.” The only way to know for sure is to insert a camera through the wall and have a look around. 

    knob and tube rewiring
    knob and tube rewiring in the attic after a fire
    knob and tube rewiring in the attic after a fire

    Remove Outdated K&T Wiring

    The best way to deal with knob and tube wiring issues is to have the wiring completely removed and replaced. If your home has knob and tube wires, then it’s likely that it’s been there since the early 20th century, a time when electrical systems powered fewer appliances. Replacing outdated K&T wiring with more modern copper wiring will increase the energy-efficiency of your home and allow you to meet current Electrical Safety Code standards. 

    It’s also a good idea to put in a new electrical panel to ensure your home’s systems are able to handle today’s electrical usage requirements. Contact Attic Projects for knowledgeable and friendly service to remove and replace your knob and tube wiring. 

    Benefits of Replacing Electrical Wiring

    Increases energy efficiency

    Lowers insurance premiums

    Reduces the risk of electrical fire and shock

    We Can Remove & Replace Electrical Wiring

    Attic Projects specializes in replacing outdated and unsafe knob and tube wiring. This is not a DIY project that any homeowner should attempt, and it’s best left to a qualified and licensed electrician. Attic Projects prides ourselves on our expert troubleshooting capabilities, and we will ensure that your electrical wiring replacement is handled professionally so that your home is as safe as possible.



    We live in an older home near a large park area. Since buying our home, we’ve had to deal with the occasional rat. These guys came out and sealed my entire attic space – vs setting a few traps. Then vacuumed out the entire space that had nearly 100 years of debris – including from our new roof and insulated the entire house. Love the 5 year warranty against the rats and we already notice how much warmer the house is. The did a great job keeping area clean and protecting floors, walls while working. Highly recommend.


    It’s a stressful situation when you find black mold in your home. The guys at Attic Projects were professional, polite and respectfully clean. They finished the job in a timely manner and went the extra mile to make sure I was satisfied with their work. Once the job was completed we instantly noticed a difference in our home’s humidity- going from 70% to the optimal 50%. I’d highly recommend these guys. Jordan, your customer service was top notch, thank you for making this a stress free experience.


    Attic Projects was so incredibly thorough and detailed with their description of how and why they were going to do each step, I knew I could trust them. These guys get it!! Total professionals, hard workers and they invited me to poke my head up in the attic during and after the job was complete. My in-laws received before and after pics and received a 5-year warranty on rodent proofing This was a big job and these guys absolutely killed it. I’d recommend them to anyone with similar issues. Thanks Attic Projects!!

    LEE S.

    Frequently Asked Questions:

    Can knob and tube wiring really last 100 years?

    Yes, and it was most popular about 100 years ago. However, you shouldn’t necessarily keep your wiring for 100 years. The risk for electrical shock increases as the demand for energy increases. If you have knob and tube wiring, no matter how old it is, you should consider having it replaced.

    Is knob and tube wiring still put into homes today?

    Typically, no. Most modernized homes do not have knob and tube wiring put in when constructed, simply because the technology is outdated and can cause more electrical problems than you know.

    Can knob and tube wiring affect my insulation?

    Actually, yes knob and tube wiring can affect your insulation. You are required to use a rubber or cloth insulation with knob and tube wiring. This can lead to cracking and drying out of insulation in your home since it is supposed to last 100 years, but the insulation is not.

    Where can I find someone to fix my knob and tube wiring?

    Most handymen and electricians don’t work with knob and tube wiring, so it is hard to find someone who can properly and safely work with your electrical issues. Contact Attic Projects today to get a free, professional inspection of your knob and tube wiring.

    All Services are Covered by Our


    We doubt that you’ll need us again, but if you do — we got you covered.

    • 100% Satisfaction Guaranteed
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    *Insulation materials qualify for our 20 Year Warranty


    Do You Qualify for a Rebate?

    Damaged insulation from mold, moisture, or pests? Looking to lower heating and cooling bills, or just wanting to improve your home’s insulation R-value? Perhaps you recently built a new home. Whatever the reason, don’t pay full price for new insulation.

    Earn An Instant Insulation Rebate For Up To $600 Today!

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    Humane Rodent Removal and Proofing

    Rodents are a nightmare for any homeowner. They can lower the value of your home by causing serious damage, foul odors, and extensively unsanitary conditions. They also pose a significant health risk to you and your family by spreading disease and causing illness. The last thing you want is to waste your time removing rodents, only to have them move right back in. At Attic Projects, we not only humanely remove the rodents and pests from your home, but we also rodent-proof your home so they can’t come back. In order to keep the pests and rodents out permanently, you have to close up every entry point that they may squeeze into. Call Attic Projects today to get your free estimate.



    Fill out the form or give us a call at 425.516.1055

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