How to Add Insulation to Existing Attic Insulation
Insulation is the most important material when discussing the energy efficiency and comfort of your home. It helps keep your home cooler in the summer and warmer in the winter. Although a well insulated home is more comfortable and energy efficient, most homes in the U.S. do not have adequate insulation levels. Of all the areas in a home that contain insulation, the easiest place to add more is in the attic space. And while there are many different types of insulation available, the easiest to work with on a do-it-yourself basis is fiberglass batt insulation. Does this Spark an idea?
Things You'll Need
- Dust mask
- Gloves
- Coveralls (or old clothes)
- Tape measure
- New insulation
- Utility knife
Instructions
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Dress properly before spending an extended amount of time in an attic or anytime you will be handling insulation. Wear a dust mask, long sleeves ( or coveralls) and adequate eye protection. Fiberglass insulation can be a lung, eye and skin irritant, so you'll want to protect yourself.
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Assess the quality of your existing attic insulation. Before adding on, it's vital to make sure you have a good base to add to. Even small gaps can significantly degrade the overall performance of insulation materials. Look for bare spots or gaps between ceiling joists and insulation, because you'll want to fill such spots in before new insulation is installed.
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Measure your attic space and calculate the area you want to insulate. This will help you purchase the proper size rolls of insulation. Also, visit the Energy Star website (see Resources section) to determine the best R-value to insulate to.
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If the existing insulation does not come level with ceiling joists, you'll need to fill in those areas before adding a second layer. If that is the case, measure the distance between joists (typically 16 or 24 inches), and purchase the corresponding width of fiberglass batt insulation rolls.
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Install the second layer of insulation perpendicular to the first layer. Roll it out smoothly and lightly fluff as you go. Take care not to compress any existing insulation as you work, as that will decrease its effectiveness. Start on the perimeter and work your way towards the attic access.
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Be sure to insulate the attic access, whether it's a ceiling hatch or pull-down ladder. However small, leaving this area uninsulated will decrease the overall R-value of the attic insulation.
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Tips & Warnings
Check with your local utility provider to see if there are any rebates available for your project.
