New Garage Doors · Tuscaloosa, AL
Insulated garage doors and R-value choices for Tuscaloosa heat
Garage hot enough to bake the opener and the room above it? An insulated door slows the heat coming through the biggest opening in the house. We compare polystyrene and polyurethane cores, explain the R-value labels and install the door with springs sized to its added weight.
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- Tuscaloosa, Northport and West Alabama
- Polystyrene and polyurethane cores
Updated October 2026
An insulated garage door in Tuscaloosa uses 1 of 2 cores between its steel skins: polystyrene foam boards, or polyurethane foam injected and glued to the steel. Polyurethane gives a higher R-value in the same thickness and a stiffer door. Either one keeps an attached garage cooler than a single-layer steel door.
Insulated doors
What an insulated door changes in an attached garage
A garage door is the largest uninsulated wall in most houses. A single-layer steel door in afternoon sun soaks up heat and radiates it into the garage, and from there into any bedroom above or kitchen beside it. An insulated core slows that transfer. It also makes the door stiffer, so it rattles less in wind and dents less when a ball or bumper meets it.
R-value labels need a little care. Some makers quote the R-value of the foam alone, and others the whole section with its steel skins and joints. Compare like with like, and look for a calculated door R-value where it is given. Weight matters too: an insulated door is heavier, so its springs must be sized to it. Our article on whether an insulated door is worth it in Alabama heat goes deeper.
Core types
Polystyrene versus polyurethane: what each core gives you
| Polystyrene core | Polyurethane core | |
|---|---|---|
| How it is made | Rigid foam boards fitted into each section | Foam injected between the skins, sticking to both |
| R-value in the same thickness | Lower | Higher |
| Stiffness and dent resistance | Good | Best, the foam glues the skins together |
| Price | Lower | Higher |
General differences by core type. Each maker publishes its own R-value for each model.
Cost
What an insulated garage door costs
Published ranges for insulated doors and add-on kits.
| Job | Typical range | Source |
|---|---|---|
| Insulated door installed, Angi | $1,100 to $4,200 | Angi |
| 1-car insulated door installed, HomeGuide | $750 to $1,900 | HomeGuide |
| Insulation kit for an existing door | $50 to $200 | HomeGuide |
Planning ranges from the publishers listed, not our quotes. HomeGuide puts a 2-car insulated door at $1,500 to $3,700 and up.
What moves the price
- Core type. Polyurethane costs more than polystyrene for a similar door.
- Thickness and layers. Three-layer doors with a steel back cost more than two-layer doors.
- Door size. A 16-foot double needs more foam, steel and spring than a single.
- Windows. Insulated glass in the window sections adds cost.
- Springs. A heavier insulated door may need larger springs than the old one.
In the job
What comes with an insulated door install
- Measurement of the opening and headroom
- Old door, springs and track taken down and hauled away
- Insulated sections with thermal breaks at the joints
- Torsion springs sized to the heavier insulated door
- Bottom seal fitted to the slab to stop drafts
- Side and top stop seals checked along the jambs
- Opener force reset for the added weight and tested
Insulation choices
Polystyrene vs Polyurethane
Polystyrene is the budget-friendly core. Rigid foam boards are cut and fitted into each section, sometimes with a steel back skin to sandwich them. It insulates well for the money and suits most attached garages. Polyurethane is foamed in place, expanding to fill the space and sticking to both skins, which makes a thinner, stiffer door with a higher R-value. If a bedroom sits over the garage or you work out there in summer, polyurethane is usually worth the step up.
Insulation Kit for an Existing Door
If the door itself is sound, a kit can add some insulation without replacing it. Kits use foam panels or a reflective foil wrap cut to fit each section, and HomeGuide puts them at $50 to $200. They help, but less than a factory core, and they add weight. We check the spring balance after a kit goes in, because a door that was balanced before can become heavy enough to strain the opener. Panels must also clear the rollers and hinges.
On the visit
How an insulated door installation goes
Measure and choose
We measure the opening and walk through the cores, R-values and section designs that fit.
Remove the old door
Spring tension is released, then the old door, track and springs are taken down.
Install and seal
The insulated sections are stacked and hinged, the track is set, and seals are fitted at the bottom and sides.
Balance for weight
Springs are wound to the heavier door, the opener is reset, and the auto-reverse is tested.
Tuscaloosa County heat
Who in Tuscaloosa County asks about insulated doors
Insulated doors come up most on newer houses across Tuscaloosa County, where garages are attached and often have a bonus room above. Tuscaloosa's comprehensive plan puts much of the recent home building in NorthRiver, where about 3,500 residential parcels are platted but not yet built, so a large share of tomorrow's garages will be attached and ready for an insulated door from day one. The county as a whole has 241,368 residents, 107,079 housing units and a 61.4 percent owner-occupied rate, so most of the doors we replace belong to people who plan to stay and feel the summer heat in that room.
Insulated garage door makers we install include Clopay, Amarr, Wayne Dalton, C.H.I. Overhead Doors, Haas Door and Hormann.
- LiftMaster
- Chamberlain
- Genie
- Craftsman
- Clopay
- Amarr
- Wayne Dalton
- C.H.I. Overhead Doors
- Raynor
- Haas Door
- Hormann
- Martin Door
- Linear
- Marantec
Common questions
Insulated door questions
Compare section R-values between models. For most attached garages a mid-range R-value does the job, and a room above justifies more.
Polystyrene usually does the job there. Save polyurethane for a garage under a bedroom or one used as a summer workspace.
It makes it noticeably less hot, not cool. Attic heat and walls still add heat unless they are insulated too.
Usually, if the springs are sized to the new door so the opener only guides it. We reset force and travel after the swap.
Kits are made for it, but the added weight can throw off the balance. Have the springs checked afterward, or book a tune-up to reset it.
Yes. The foam core deadens rattles and vibration, so the door runs quieter on the same opener and rollers.
Yes. The same core slows heat loss on cold mornings, which helps rooms that share a wall with the garage.
Foam alone scores higher than the finished section with skins and joints. Comparing sections gives a fair picture.
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