How to Install Batt Insulation in an Unvented Attic

Installing batt insulation in an unvented attic can be fiddly and labor-intensive, especially in areas where there is little space to move around. However, it does not require any special skills, and doing it yourself will save you money. Since hot air rises, keeping your home warm through the winter months requires that you have plenty of insulation in your attic space. If not, heat will escape and it will be harder and more expensive to keep your home warm. Assuming your attic has unfinished walls, installing batt insulation is not complicated. You may want to check with a building contractor to determine whether or not you should also have venting installed in your attic.

Tools and Materials Needed:

  • Batt insulation of the correct width
  • Staples
  • Stapler
  • Measuring tape
  • Utility knife
  • T-square
  • Marker pen

Step 1 – Measure the Area

Determine how much batt insulation you need by measuring the area of the attic space that you need to insulate. Always account for a little extra. When it comes to buying the insulation, make sure that it is of the correct width so that it will fit tightly into the space between the wall and ceiling studs.

Step 2 – Cut the Insulation to Fit

Lay down the insulation material onto the floor with the paper-backing side facing upwards and the insulation facing the floor. Measure the height of the wall or ceiling and transfer this measurement onto the back of the batt insulation. Use a T-square and cut along the line that you have marked. Once you have cut the section of insulation, you are ready to install it. If you prefer, you can prepare all of the insulation by cutting it to size before you start fitting it.

Before continuing, it is a good idea to wear safety gear, as insulation can contain irritable materials that can cause breathing problems and skin irritation. Use gloves, safety goggles and a dust mask throughout the installation process.

Step 3 – Install the Insulation

When installing the insulation, the paper-backed side should be facing the inside of the attic space and the insulation should be facing the roof or wall itself. Hold up the first section of insulation to the top of the wall and fit it between the two studs. As stated previously, it should fit perfectly for standard installations. The insulation material will have thick paper tabs on the edges of it which should be stapled to the studs to hold them in place. Use a heavy-duty stapler and half-inch staples suitable for the job. Starting from the top of the batt insulation, continue stapling the paper tabs onto the wall or ceiling in the same manner. The insulation should ideally be stapled every foot. Continue in the same manner until you have installed the insulation over the walls and ceilings of the attic space. Make sure that no cavity between two wall or ceiling studs remains, otherwise the insulation will not be effective enough.