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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.

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.

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. 

The cost to install a garage door is usually around $1,224, with most homeowners seeing a price between $755 and $1,696. Several factors come into play, like the type of door, material (wood is pricier than vinyl), insulation, and size. Labor costs also play a role because DIY garage door installs are a bad—and dangerous—idea. Most professionals bundle labor into the total price, but if it’s separate, expect to pay anywhere from $200 to $500.