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If you plan on heating your garage, you must install a vapor barrier when drywalling the garage. A vapor barrier protects your garage from frost and mold that can occur through condensation. If your garage is unheated, you don't need to install a vapor barrier. The only exception is if you regularly crank the heat in your car before getting in it. In this case, you may still want to install a vapor barrier, as your car can heat your garage.

Yes, you can pressure wash epoxy floors, but you must take precautions to avoid damaging the surface. While most epoxy floors can be cleaned with a mop, you might choose to pressure wash if the floor is stained, has ground-in dirt, or is covered with mold or mildew. To do so safely, first soak any stains or dirty areas with a gentle cleanser. Use a lower pressure setting with a gentle nozzle, such as a green, white, or black tip, or a 45-degree angled tip. Keep the spray nozzle at least 18 inches away from the floor to protect the surface. Using a surface cleaner attachment or a rotary scrubber can also help prevent overspray. Be cautious if using a power washer that heats the water, as the combination of heat and pressure may be too powerful and could damage the epoxy coating.

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.

If you open your garage manually, you don’t need sensors. If you have an automatic garage door opener, sensors are required by law. The federal law UL 325 mandates that all residential garage door openers in the U.S. must include sensors. Designed to prevent accidents and reduce the risk of entrapment, the sensors should be able to reverse the motion of the garage door within two seconds of detecting an obstruction. The sensors are there to keep you, your family, and your belongings safe from a door that might otherwise come down too hard or too fast.