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The amount of paint needed to cover a two-car garage floor depends on the surface area and the product's coverage rate. On average, a standard two-car garage floor measures 400 to 500 square feet. Coverage ranges from 100 to 200 square feet per gallon for epoxy paint, depending on the product and application method. After some quick math, you may need 2 to 5 gallons of epoxy paint with two coats to cover a two-car garage floor. 

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.

A garage door should last 30 years, give or take, before it needs replacing, so your panels should last for around that long as well. However, you should replace your garage door panels sooner if the door doesn’t function smoothly if one of the panels gets visibly damaged, or if an issue with a panel is creating a security issue.

It’s typically less expensive to buy a garage-building kit than to build a garage from scratch if you’re supplying all the labor. However, unless you are an experienced builder, you will still need to hire pros to install the foundation, concrete floor, and add electrical and plumbing to your garage kit. In that case, it’s worth the investment to build a garage through a local garage builder who can coordinate the hiring of other necessary pros.