Efficient doors are typically a sandwich of two strong metal or fiberglass sheets bonded around a core of urethane foam. Strong and durable, these doors have gaskets similar to those on refrigerator doors, and are available in a wide variety of styles, colors, and designs. Such insulated doors with gasket seals are typically more than three times as efficient as traditional doors. Proper Fit and Weatherstripping Weather-stripping materials range from inexpensive adhesive backed plastic strips and foams to metal strips that are nailed or screwed in place. Choose products that work well, are as durable as possible, and fit your budget.
Careful installation is critical to effectiveness.
For doors that receive frequent use, quality products such as spring steel or metal-backed vinyl will last much longer. If weatherstripping is insufficient to seal the spaces, or the door does not squarely butt against the jambs, it may require minor modifications before weatherstripping. Often the door and trim is removed and the jambs are replumbed. Check for Effectiveness A properly weatherstripped door, when checked from the dark side, will not allow light to leak around the perimeter. It should also require little effort to open or close.