However, you may want to use a softer material such as felt or foam so that the mail slot flap is not difficult to open. You can purchase weatherstripping made of open-cell foam, felt, vinyl, or different types of metal. Weatherstripping is affordable, readily available, and easy to use on various surfaces. Apply weatherstrippingĪnother simple and easy way to insulate your mail slot is by applying weatherstripping. Apply the foam to all four sides of the slot to keep warm air inside during the winter (or cold air in the summer).Ĭlick here to see this insulation foam on Amazon. In this case, the non-expanding foam may be better. If your mail slot fits properly around the door, expanding foam may not be necessary.

You can also use expanding and non-expanding foam insulation to prevent air from getting inside of your home. Be sure to wipe down the area with a cleaning solution and dry it completely so that the caulk sticks properly.Ĭlick here to see this caulk on Amazon. If you do, take your sealant or caulk and apply it to these areas. You may also be able to visually see any holes in the space between the sides of the slot and the door. The easiest way to do this is to place your hand around the perimeter of the slot and feel for any cold drafts. However, one of the best ways to reduce this is to seal and caulk the edges of the slot properly. The opening itself, even when closed, presents an opportunity for cold air to get inside your home and warm air to escape-though we'll address how to insulate this area in a moment. If the slot has any holes or cracks around it, it'll be fairly easy for air to penetrate the opening. Insulating your mail slot can help to prevent unwanted drafts and air leaks near the door area. This means ensuring that there are no cracks and gaps between the slot and the door and that all of the screws are tight and secured firmly on its top and the bottom. Continue reading to learn more about ways to insulate your mail slot effectively.īefore insulating your mail slot, ensure that the slot is correctly installed. It can also prevent warm air inside your home from escaping to the outside, leaving the inside cooler than desired.

Insulating your mail slot can help prevent cool air from seeping inside your home. Here are some ways that you can insulate your mail slot: So how can you insulate a mail slot? And what materials can you use? We have researched the best ways to do this. It's common to assume that these slots are so small that they aren't worth insulating, but this isn't necessarily true. Insulating a mailbox may not be something you think about her regularly.

Gun metal mail slot for door