How To Insulate Your Attic Hatch

Posted on: 20 January 2015

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However well insulated your home is otherwise, if your attic hatch is poorly insulated you could be losing a lot of your energy dollars. Most attic hatches are made out of a section of drywall or a cut piece of plywood. They usually have no insulation at all, so by following the simple steps below you can make a significant dent in your home heating and cooling bills.

What You Will Need

  • A Sheet of Rigid Foam Insulation (96x 48x 3/4 Inch)

  • Utility Knife

  • Marking Pencil

  • Chalk Line

  • Measuring Tape

  • Caulking Gun

  • Tube of Silicone

Step 1. Lay your sheet of rigid foam insulation on a concrete or other surface that won't be damaged by a utility knife.

Step 2. Use a measuring tape to measure the length and width of the attic hatch. Use a marking pencil and a chalk line to transfer these measurements to the foam sheet. Use a T-square to help you get the lines straight.

Step 3. Use a utility knife to cut out the shape you have defined in step 2.

Step 4. Insert a tube of silicone caulk into a caulking gun and apply a bead of caulk to the top of the hatch (the part that's in the attic). Then place the section of foam against the attic hatch and press on it. Allow the caulk to cure before you proceed.

Step 5. Cut out sections of foam that will allow you to create a 4 inch border of foam board around the hatch opening. Again, apply a bead of caulk to the foam board and then press it into place. Allow it to dry.

Step 6. Add 8 inches to the width and length measurements you took of the door in step 2. Mark out and cut a piece of foam board that matches those dimensions.

Step 7. Apply a bead of caulk to the foam board that you attached earlier to the attic hatch. Then take the piece you cut out in step 6 and press this on to the attic hatch foam board, trying to make sure it is even on all sides.

Step 8. Allow the silicone caulk to completely cure. The result of this last step is that you will have created an insulated cover that overlaps the insulated border you installed in step 5. This should thoroughly insulate and seal your attic hatch against any heat transfer or airflow.

For more information on energy and heating efficiency, talk to local heating professionals (such as West Country Heating & AC).