How to · 3 to 4 hours
How to insulate a garage door
Cut rigid foam or a purpose-made kit to fit each panel and hold it in with the retaining clips. It is a straightforward afternoon. The part people miss is that it adds weight — usually fifteen to thirty pounds — and the springs were balanced for the door without it.
Read this first
After insulating, the door will feel heavier and the opener will work harder. The springs need rebalancing by somebody with winding bars — do not try to compensate by winding up the opener force.
What you need
- An insulation kit or rigid foam board
- A utility knife
- A straight edge
- Gloves
5 steps
Doing it
- Measure each panel individually.They are rarely all the same, especially the bottom one.
- Cut each piece about a quarter inch under, so it goes in without bowing the panel.
- Fit the retaining clips or push the foam behind the panel struts.
- Leave the bottom panel's weather seal alone.
- Test the balance: with the opener disconnected, lift the door halfway and let go.A balanced door stays put. If it now sinks or rises, the springs need adjusting before you use the opener again.
Where it stops being yours
Rebalancing the springs is the pro half of this job, and it is not optional.
More how-to
Also asked
When it does not go to plan
Will a kit make my door too heavy?
It can, and that is the part nobody mentions. Insulation is weight, and the springs were sized for the door as it was. A door that no longer stays put when you stop it halfway is out of balance, and the fix is a spring change rather than living with it.
Is it worth doing at all?
If the garage is attached, or there is a room above it, yes — you feel it in a Florida summer and in the heating bill further north. On a detached garage you only park in, the money does more somewhere else.
Kit, or a new insulated door?
A kit is a fraction of the price and looks like a kit from inside. A factory insulated door is quieter, stiffer and does not change the balance, because it was built and sprung as one thing. If the door is old enough to be replaced within a few years, do not insulate it twice.