Garage Door Insulation — Panel Kits and Seals on an Uninsulated Door
A builder-grade steel door is one sheet of metal between the garage and January. Panels cut into each section and a new seal at the floor make the garage, and the room above it, easier to keep warm.
JMB Builders does garage door insulation on existing single-skin steel and wood overhead doors across the Twin Cities metro. We cut rigid foam panels to fit each section between the rails and stiles, face them so they stay put, and replace the bottom seal and the seals between sections so the door stops leaking air at the floor. Priced per door, quoted from a photo of the inside of the door within one business day.
- Priced per door, single or double
- Foam panels cut to each section, faced and retained
- New bottom seal and section seals included
- Quote from photos in 1 business day
- Licensed MN contractor BC809005
Most attached garages in the metro were built with the cheapest overhead door the builder could buy: a single skin of steel on a frame of rails and stiles, open on the inside, no insulation at all. In winter the whole door is at outside temperature, the bottom seal has gone flat, and the garage is a few degrees warmer than the driveway. That is the cold that gets into the house through the door to the kitchen and up through the floor of the room over the garage.
A panel kit is the fix that does not require a new door. Rigid foam is cut to fit each section of the door between the horizontal rails and the vertical stiles, faced with foil or a vinyl skin so it does not shed, and held in with the door's own lips or with retainer clips. Then the rubber at the bottom of the door gets replaced, and the joints between sections get a seal where the door design allows one. The door is quieter, stiffer and noticeably warmer to stand next to.
It is not a substitute for an insulated door on a heated garage, and it does not fix a door that is already out of balance or dragging on the track. We tell you which one you have from the photos.
What you supply
- A photo of the inside of the garage door, closed, showing all the sections and the rails and stiles
- A photo of the bottom of the door from outside, closed, so we can see the seal and the floor gap
- The door width, or the number of cars it fits, and whether the garage is heated
- A specific panel kit if you have already bought one; otherwise we supply foam panels cut on site
What JMB supplies
- Rigid foam board cut to each section, faced to the inside, and retained with the door lips or clips
- New bottom seal in the existing aluminum retainer, or a new retainer where the old one is bent or missing
- Section-to-section seals and a header seal where the door design accepts them
- Foam and sealant at the gaps between the door and the jamb stop where the old stop is loose
- A check that the opener force settings and door balance still work with the added weight
- Photos of the finished door in your job folder
How it is priced: per door
Quoted in writing from your photos within one business day. What moves the number:
- Single vs. double door, and how many sections each has
- Steel door with lips that hold panels vs. a wood or flush door that needs clips or a face frame
- Bottom seal only vs. bottom seal plus section seals and a header seal
- Whether the bottom retainer is bent or missing and has to be replaced
- Uneven garage floor that needs a thicker bottom seal or a threshold strip to close the gap
- Windows in the top section that need panels cut around them
The inside photo with the door closed shows the section count and the frame style, which is most of the quote.
How long it takes
Single door with panels and seals: two to three hours. Double door: a half day.
How your project works
- 1
Send photos, get a written quote
Send three photos of the space and a sentence about what you want. You get a clear, itemized quote within one business day. We only come out to measure first when the job needs a tape measure — no pressure, no games.
- 2
Pick materials, or bring your own
We help you choose profiles and materials that fit the house and the budget, or match your existing millwork exactly — or you buy the door or trim yourself and we install it. Everything is confirmed before the crew is scheduled.
- 3
Clean, precise installation
The crew shows up on time, protects floors and furniture, and installs with tight joints and consistent reveals. Photos of the finished work go in your job folder.
- 4
Walkthrough and invoice
We walk the finished work with you. If anything is not right, we fix it before we call the job done. Then one invoice, paid by check or direct deposit — no card fees, no payment links.
Situations and options
Foam panel kit in a steel door
Foil-faced rigid foam cut to each section and tucked under the door's rails, which hold the panel without adhesive. The most common job on builder-grade doors. The foil face turns to the inside so it is bright, cleanable and stays in place.
Wood or flush-back doors
A door with no lips to hold a panel gets foam board cut to fit and retained with clips or thin battens screwed to the stiles. On an old wood door we check the panels and joints while we are at it and reglue any that have opened up.
Bottom seal replacement
The rubber astragal at the bottom of the door slides out of its aluminum retainer and a new one slides in, sized to the floor gap. On an uneven slab we use a taller bulb seal or add a threshold strip glued to the floor so the door meets it flat.
Section and header seals
Weather seal between the sections and along the header stop closes the gaps that show daylight when the door is down. The jamb-side stop with its built-in seal is on our garage door jamb page; we do it in the same visit when the old stop is shot.
When to replace the door instead
A heated garage, a door that is rusting at the bottom, or one whose sections are already dented and racked is better replaced with a factory-insulated door. We tell you when a kit would be money spent on a door that is going anyway.
Garage Door Insulation — Panel Kits and Seals on an Uninsulated Door: questions, answered
Is it worth insulating a garage door?
On an attached garage, yes. The door is the largest single surface between the house and outside, and a builder-grade single-skin steel door has no insulation at all. Panels in each section and a fresh bottom seal keep the garage well above outside temperature, which makes the house door and the floor above the garage less cold. On a detached, unheated garage you use for storage, it matters less; a new bottom seal alone may be enough to keep the snow and mice out.
What kind of insulation goes in a garage door?
Rigid foam board, faced on the room side, cut to fit each section. Foil-faced polyiso or polystyrene panels tuck under the lips of a steel door and stay put without adhesive; a door without lips gets clips or battens. Fiberglass batt kits with a vinyl face are sold too, but they sag over time and hold moisture, so we use foam. Spray foam is not used on a door; it adds weight unevenly and cannot be removed.
Will insulation panels make my garage door too heavy?
Foam panels add a few pounds to the whole door, which most spring setups absorb without noticing. After the panels are in we check the balance: with the opener disconnected, the door should stay put halfway up. If it drifts down, the springs need a small adjustment, and that is work for a garage door company because torsion springs are dangerous to adjust without the right bars. We tell you before we leave if it needs it.
How do you replace the rubber seal on the bottom of a garage door?
On most steel doors the seal is a rubber strip with a T shape on each edge that slides into grooves in an aluminum retainer along the bottom of the door. The old one slides out sideways, the new one slides in, sized for the gap to the floor. When the retainer is bent, missing or the door is wood with a nailed-on strip, we screw on a new retainer first. The seal is chosen for the floor gap, so send a photo of the closed door from outside.
Should I insulate the garage door or replace it?
Insulate it when the door is straight, works smoothly and just has no insulation; the panels and seals cost a fraction of a new door. Replace it when the bottom section is rusting, the sections are dented or racked, the door is a heavy old wood one, or the garage is heated and you want an insulated door with a real thermal break. We will say which from your photos, and we install the new door too if that is the answer.
Does insulating the garage door make it quieter?
Yes. A single-skin steel door drums in the wind and rattles when it opens. Foam panels in each section stiffen the skin and stop the drumming, and the new bottom seal stops the bang when the door hits the floor. Most people notice the quiet before they notice the warmth.
Recent JMB work, from our job log
59 installs recorded across 30 Twin Cities communities since Dec 2025. Window and door installs for homeowners and for the builders and dealers we sub for. Counts come straight from our job log; no customer names.
Get a written quote for this job
Three photos and a sentence is enough. You hear back within one business day. Or text the photos to 763-204-2099.
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Read morePage reviewed September 26, 2026 · JMB Builders LLC, MN license BC809005 · All insulation pages
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