Rewiring and Knob and Tube Insulation Removal in DFW

Rewiring Exposes Your Attic for Better Insulation

My name is Neal. I run DFW Attic Insulation. If you own a pre-1930 home in Highland Park or University Park, you likely have knob and tube wiring. That wiring is a fire hazard when covered by insulation. The Department of Energy warns that insulation can trap heat around knob and tube wiring, leading to fire risk. When you decide to rewire, the old wiring comes out. That leaves your attic open and empty. It’s the perfect time to address insulation and air sealing. Don’t cover the new wiring with old, dirty insulation. Start fresh. I’ll walk you through the process.

The IECC 2021 Table R402.1.2 sets the prescriptive minimum for attic insulation in Climate Zone 3 (which includes DFW) at R-38, with an equivalent U-factor of U-0.030. The International Residential Code (IRC) Section R806 requires balanced attic ventilation at a 1:300 ratio minimum.

Why Knob and Tube Wiring Is a Fire Hazard with Insulation

Knob and tube wiring was designed to be in open air. It relies on airflow to dissipate heat. When insulation covers it, heat builds up. The wire can overheat and start a fire. The U.S. Department of Energy states that covering knob and tube wiring with insulation is a fire hazard. Many older DFW homes still have this wiring. If you have it, do not blow insulation over it. Rewiring is the safe solution. Once the old wiring is removed, you can insulate properly without risk.

Electrical Penetrations Cause Attic Air Leaks

Old wiring runs through holes drilled into framing. Those holes are often not sealed. They create air leaks that pull conditioned air out of your home. The ENERGY STAR program notes that sealing air leaks is one of the most cost-effective ways to improve energy efficiency. When you rewire, the electrician will remove the old wiring and make new penetrations. That’s your chance to air seal every gap. I use caulk and expanding foam around new wiring. This stops air movement and keeps your attic insulation working properly.

Rewiring Gives You Access for Comprehensive Air Sealing

Most attics are hard to move around in. Old insulation, debris, and wiring make it tough. When you strip the attic down to the framing for rewiring, you have clear access. I can air seal top plates, recessed lights, and plumbing vents. I can also seal around the new electrical boxes. This reduces your energy bills and improves comfort. Air sealing is the first step before adding insulation. Without it, insulation does less work. In a DFW climate, that means higher cooling costs in summer.

What Insulation to Use After Rewiring

Once the rewiring is done and air sealing is complete, you need new insulation. I recommend blown-in cellulose or fiberglass. Cellulose is treated with fire retardants, which adds safety. It also fills gaps better than fiberglass batts. The R-value you need depends on your attic. For DFW, the ENERGY STAR recommends R-38 to R-60. I can calculate the right depth based on your home’s age and construction. Do not use loose fill over old insulation that may contain debris. Start with a clean slate.

When Not to Insulate Over Knob and Tube Wiring

Here is when you should not buy insulation: if you still have knob and tube wiring in place. Do not cover it. No insulation manufacturer recommends it. Your insurance may even deny a claim if a fire starts. I have walked away from jobs where homeowners wanted to blow insulation over active knob and tube wiring. It is not worth the risk. Rewire first, then call me. If you are not sure what wiring you have, I can inspect your attic and tell you. No charge for a look.

The Rewiring and Insulation Sequence for DFW Homes

Step one: hire a licensed electrician to remove knob and tube wiring and install new Romex. Step two: after the electrician finishes, have me air seal the attic. I seal every penetration, including the new wiring holes. Step three: install new insulation. The whole process can be done in a few days. You should not have to live in a dusty attic for weeks. I coordinate with your electrician to minimize disruption. For homes in Highland Park and University Park, this is common. I have done many attics after rewiring.

Why You Should Pair Rewiring with Attic Insulation

Rewiring is expensive. You are already paying for labor and materials. Adding attic insulation and air sealing at the same time costs less than doing it separately. The electrician is already there. The attic is empty. I can work alongside or after them. The combined result is a safer home with lower energy bills. Rewiring with insulation is a smart investment. Plus, you get peace of mind knowing your attic is not a fire hazard. If you are planning a rewire, call me before you schedule the electrician. I will walk through the attic with you.

HomeAdvisor reports the national average attic insulation cost at $2,100 with most homeowners paying $1,700 to $2,500. Angi data shows DFW pricing runs $1 to $3 per square foot for blown-in installation.

Frequently Asked Questions

Ready to make your attic safe after rewiring? Call me at (469) 895-2695 to schedule an inspection. I will tell you exactly what your attic needs.