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Garage door insulation can last anywhere from 20 to 100 years depending on the type of insulation. Cellulose has the shortest lifespan coming in at between 20 and 30 years, while spray foam, mineral wool, and fiberglass can last between 80 and 100 years with proper maintenance. 

Humidity plays a role in how long more susceptible insulation materials—like fiberglass—last. Once fiberglass batts reach the 15-year mark, you'll need to routinely inspect your insulation to ensure that it is in mint order.

When you’re painting a garage floor, it’s best to use a combination of rollers and brushes. You’ll want to start with a brush, making a border around the edges where the floor meets the wall. From there you can use a roller, though some people also like to do the entire first coat with a brush because it’s easier to work the paint into the textured concrete.

Generally speaking, it is difficult to install a garage door. It’s a heavy object that poses a danger if it falls. If you are an experienced DIY-er, and you get help from another person with experience with this project, it is possible to install a garage door. However, manual doors are simpler to install than automatic doors because they are lighter and don’t require the installation of cables or a motor. It’s always best to hire a professional garage door contractor to install these, due to the safety risks involved and to ensure it’s done correctly. 

If your garage door seems to freeze every winter, you can try rubbing silicone spray or petroleum jelly around the edges and rollers of the garage door. However, it’s a good idea to avoid direct application of silicone sprays like WD40 to rubber edges, which could damage them over time. A garage door that frequently freezes shut could need a full replacement, especially if it’s showing signs of rust or other wear and tear.