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You’ll usually need to prime a garage floor before painting—especially if the floor is unpainted. Garage floors are made from concrete, which is porous and produces dust. The dust can contaminate the paint and cause issues with adherence. 

Primer creates a barrier and gives you a clean surface to work on. It also minimizes absorption to help give you an even, pro-looking paint job. Make sure you choose a primer that’s specifically designed to cover concrete flooring.

The best way to prevent your garage door from freezing is to install a permanent source of heat in the garage. You can have a professional tie in your main heating system or install a ductless mini split as a standalone heating solution. You can also insulate the garage to prevent temperatures from dropping to the point that the door freezes shut.

The smallest size a standard 2-car garage can be is 20 feet by 20 feet, so at these dimensions, you could reasonably expect to fit two cars inside. However, it’s going to be a tight fit, especially if you have larger SUVs or pickup trucks. For smaller cars, 20 x 20 should be plenty for parking and some space to maneuver around the cars. A larger garage size would be better to ensure you have room to open the doors and transport groceries or other items around the cars.

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.