How To Install Insulation In Attic Ceiling

If you re installing additional insulation in an attic that s already insulated use unfaced insulation that doesn t have a vapor barrier.

How to install insulation in attic ceiling.

Choose your insulation type. When rolling the insulation cut it to length using a utility knife. So if you re installing insulation in an attic that doesn t have any used faced insulation and put the paper side down toward the ceiling. Using a straightedge as a guide make your cut image 2.

Cut side fin and fold baffle at the measured mark to allow for correct insulation height. This old house general contractor tom silva and host kevin o connor demonstrate the proper way to insulate an attic. Before installing determine the insulation material best suited for your home. When you reach the end of a line pull the insulation back slightly then place it on a joist so there is a solid surface to cut on.

Begin laying in the insulation starting at an area farthest from the attic access image 1. Lay the batts across the ceiling joists covering the existing insulation. Calculate how much you need. You can find out more in our articles on how to apply a vapor barrier to attic insulation and which way to face insulation.

Purchase rolls or packages of insulation that will fit in the spaces between the ceiling joists. For all eaves with vents fasten bottom of baffle in place to allow insulation to completely cover the top plate. While wearing dust mask and gloves carry r 38 batts of unfaced fiberglass insulation into the attic. See below for a shopping list and tools.

The standard width for joists is 24 inches. Verify the height allows for 1 inch of required air space.