Step 6: Use Pipe Insulation to Fill Gaps Below Doors
One problem that is often encountered with older houses is large gaps under the doors. This can result is unwanted drafts. They sell products such as "draft blockers" to fill in these gaps. But why pay $10 for a small piece of shaped foam. You can get similar results from a piece of pipe insulation. Just open it up and wrap it around the bottom of the door. It should tightly seal the bottom of the doorway and prevent drafts.