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With the exception of small, lightweight torsion-spring garage doors, which can operate with one spring, most garage doors require two springs to work properly. Garage doors with extension springs always require two springs—if one extension spring is broken or otherwise failing, the garage door may open unevenly and could pose a hazard if the remaining spring fails.

You can prevent your garage from freezing by applying techniques like sprinkling salt onto the garage floor, installing a garage heater, shoveling snow outside the door, and more. Additional methods of preventing your garage from freezing over is to seal all potential air gaps, replace weatherstripping, and adding insulation to the surrounding walls to keep the heat from escaping.

The best method for painting a garage door depends on the door's design and the finish you want to achieve. For the most professional-looking finish, especially on doors with panels or intricate details, a paint sprayer is an excellent choice. It can easily get into hard-to-reach places and provide a smooth, even coat.

If you don't have a sprayer, or if your door is flat, a combination of a roller and a brush is the most effective approach. Use a roller for the large, flat sections to cover the area quickly and efficiently. For the best results, experts recommend a roller with a nap between ⅜ and ¾ inches thick; natural fibers can also help ensure an even coat.

A brush is essential for handling the finer details. Use it to paint grooves, angles, small panels, and the edges of the door where you need more control.

Regardless of the tools you use, it's a good idea to step back after the main application to review your work and use a detail brush to touch up any missed spots.

You do not need to drywall over most types of garage insulation. However, doing so can increase noise reduction, make the space more attractive, and keep children and pets from touching harmful fiberglass insulation. If you’re using cellulose or some other type of blown-in insulation (fiberglass and mineral wool are common), you will need drywall to contain the insulation material.