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Most garage door professionals will install insulation for a minimal charge, but there’s also the homemade approach, which involves cutting pieces of foam core and attaching them with double-sided tape.
A layer of double lip weather stripping will help you seal the gap between the door and the floor. Besides the savings, insulating your garage door reduces noise and provides a more comfortable working environment
There are a couple options to pick from if you decide to insulate your garage door. You could select reflective foil insulation (Image 1) using heavy duty polyethylene. Reflective foil insulation usually consists of two layers of heavy duty polyethylene foam sandwiched between two sheets of aluminum foil. The normal thickness is 5/16 of an inch.
The other option is molded polystyrene panels (Image 2) which carry a higher R value.
Both come in kits (Image 3) which are easy to install with a tape measure, straight edge and a utility knife. Most installation kits are made of standard sized garage doors, which are usually 9ft. by 7 ft. for single doors and 16 ft. by 7 ft. for double doors. You can order kits in more non-traditional sizes as well. If you can’t find a kit, reflective foil insulation is also sold in bulk rolls and can be cut to fit.