A compatible insulation kit can improve an uninsulated sectional garage door. Confirm the door manufacturer permits the kit and have the added weight assessed before installing it. Springs must still balance the door afterward; a stronger opener is not a substitute for correct balance.
Insulation materials for retrofitting
| Material | Notes |
|---|---|
| Fiberglass | Lightweight, inexpensive, easy to fit between panel ribs |
| Reflective foil | Reflective facing reduces radiant heat transfer only with the specified adjacent air space; it is not equivalent to bulk insulation |
| Polystyrene | Rigid foam panels, water resistant, adds some stiffness to the door |
| Spray foam | Factory-injected foam is not the same as spraying household foam onto an existing door; use only manufacturer-approved retrofit products |
What to consider before you buy
- R-value: higher means better insulation; match it to your climate.
- Garage use: a workshop or gym benefits more from a higher R-value than a garage used only for parking.
- Budget: fiberglass and reflective kits cost less than rigid foam panels.
Installing it yourself
- Clean the door and measure each panel separately.
- Choose an approved kit with its specified retention hardware. Follow material handling and protective-equipment instructions; keep clear of hinges, locks and moving joints.
- Cut the insulation to size and attach it to each panel.
Before normal operation, have the completed door's balance and opener safety reversal checked. Added weight can require different springs or adjustment by a technician; do not wait for the motor to struggle and never adjust the springs yourself.
Does it work on any door?
Most steel sectional doors can be retrofitted. Check that the door manufacturer approves the kit and the spring system can be matched to the final weight, and keep in mind that a factory-insulated door will generally outperform a retrofit kit on both R-value and sound. See our insulated garage doors guide if you are weighing a new door instead.
Comparing insulation materials in more depth? See our insulation types guide. Questions about your door or opener handling the extra weight? Call (916) 838-8182.
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