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    How to Insulate a Garage Cheaply

    Step 1: Define the Garage Type & Your Objective

    If you have an attached garage, heat retention for the whole house may be a bigger concern than if the garage is detached.

    In the case of an attached garage, you might want to consider insulation with a higher R-value to avoid heat loss during cooler months. The higher R-value an insulation has, the thicker, denser and more effective it will be at insulating. However, if you have a detached garage, unless it’s heated, then heat loss is more inevitable and R-value becomes less of an issue.

    How you’ll be using the garage factors into the equation too. For example, if you’ll be spending significant amounts of time in the garage working on cars or other projects, then you’ll want to invest in insulation with a higher R-value. But don’t worry, you can still effectively insulate a garage and save money doing it.

    Step 2. Consider Your Insulation Options

    Because your goal is to do an effective insulating job as cheaply as possible, you’ll want to focus on the most affordable insulation types that are also well-suited for DIY installation. That way you can install it yourself and save money too.

    One of your best options is fiberglass insulation that’s sold in rolls or bats. These come in a wide range of R-values to meet your needs and are usually pre-cut to fit between standard wall and ceiling joints. Another good option is form board insulation. Foam boards tend to either be made from a material called polyisocyanurate or from polystyrene. Both types can usually be found with R-values ranging from R-4 to R-8. These are sturdy, rigid boards that can be cut to size and fitted snuggly into the spaces between wall and ceiling joints.

    Don’t confuse foam board insulation with spray foam insulation. While it’s very effective, it’s usually best installed by a professional and it costs more, so we’re not recommending it was one of our cheaper options.

    Shop and save on polyiso foam board insulation at repurposedMATERIALS today!

    Step 3. Safety First

    Once you’ve decided on your insulation type and are ready to install it, make you wear the appropriate safety gear. If you’re installing fiberglass rolls, wear longer sleeves and gloves to prevent the tiny glass from fibers in the insulation material from getting on your skin and irritating it. With all types of insulation, wearing a respirator mask to avoid inhaling dust and loose particles is always a good idea too.

    Step 4: Install Your Insulation

    Now you’re ready to install. For fiberglass, simply unroll your insulation into the spaces between the wall and ceiling joints. Make sure the vapor barrier side faces the interior of the garage. Use a staplegun with at least ½” staples to hang the rolls. To install the foam boards, simply apply adhesive to the back side and fit them snuggly into place if they’re pre-cut standard foam boards. Otherwise, you may need to cut them to size using a utility knife. For extra protection against air gaps, you can also caulk the seams between boards for a better seal or use a seam tape.

    Step 5: Finishing Touches

    Once you’ve installed your insulation, you may want to cover it for a better aesthetic appearance. Hanging drywall boards over it looks nice if you don’t mind the material expense. In a detached garage, you could even get away with covering the newly insulated walls with plywood boards. From there, your garage is insulated and ready to use with the peace of mind of knowing that you’ve taken steps to make it more weather-resistant and energy efficient.

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