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How To Install Fiberglass Insulation

Fiberglass insulation is easy to install yourself and the added R value will save you money in heating and cooling costs.

Tools: Scissors, measuring tape, ladder, utility knife, straight edge (you can use a 2x4 or any piece of wood), flat piece of plywood to cut on, latex gloves, mask, wall stapler, staples
This installation is for paper backed rolls.

Tip: If you have 2x4 walls you will need R-11 or R-13 rated batts; 2x6 walls will need R-19 rated batts.

1. Wear a mask and latex gloves to do this job. The fiberglass particles are itchy and hazardous if breathed in. Tuck the gloves over your sleeves so the fiberglass does not come into contact with your skin.
2. Measure your wall from floor to ceiling and cut the insulation to size. Cutting the batt is done by placing the area to be cut, paper side up, on a piece of plywood or hardboard. Place the straight edge along the cut line and press down with your knee. Use a utility knife to slice along the straight edge. Cut several pieces at once to save time, as they all should be about the same length.
3. Starting at the top of the wall, place the insulation batt between the wall joists. Pull the paper at the top of the batt about 1 onto the top stud and staple. (If you plan on installing wallboard with an adhesive, the studs should be bare, and you must attach the paper to the sides only)
4. There is a paper flange on the side of each batt that is used to cover the front of the wall stud. This is to make stapling easier and to create a vapor seal with no open areas. Spread the flange onto the stud on each side and make your way down the wall, stapling about 6 inches apart. Smooth out the paper along the stud and go from side to side with your stapling so it remains even. Finish the wall by stapling the bottom of the batt to the bottom stud. If you come to an electric outlet, use a pair of scissors to cut a space for the box, and tuck the insulation behind the box.
5. Electric wires running through the walls should be accommodated by slicing the insulation down to the paper and tucking it around the wires.
6. Smaller spaces around windows can be filled by gently tucking loose insulation into the space. Do not pack tightly. Insulation must stay puffy to work best. If you have any joists that are narrower than the insulation batt, cut to fit allowing for a 1 overlap on each side, top, and bottom.


Home Tips &
Related Articles

What is R-Value?
R-value is a measurement to an insulations resistance to heat. Insulation contains pockets of air that slow the transfer of heat. Simply put, the higher your r-value the better your insulation is.

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