Ultimate Guide to Door Weathersealing

Installing a weatherstripping seal on exterior doors is a simple and cost-effective way to boost home insulation, prevent chilly breezes, and save money on HVAC. As years pass, the seals around doors can crack or deteriorate, allowing air to escape or enter through your home. Updating old weatherstripping is a simple home improvement that requires just a few basic supplies and can be done in less than an hour.

First, detach the existing weatherstripping. Use a flathead screwdriver to gently lift it off from the door frame. Take care to protecting the paint or finish. Once removed, remove all debris with a clean rag to clear away sticky remnants. Allow the area to dry completely before proceeding.

After that, record the dimensions of the door frame where the weatherstripping will go. You’ll need to measure the top, both sides, and the bottom. Jot down the numbers so you can cut the new seal to the correct size. Most weatherstripping comes in continuous spools or ready-made sections, so select the ideal product for your door. Common types include adhesive-backed foam tape, V-shaped vinyl seals, and bottom door seals for the bottom.

With foam tape seals, remove the protective liner and smooth it down tightly along the top and sides of the door frame. Initiate at a corner and move steadily to the opposite end, making sure the tape lies flat and makes full contact with the surface. Avoid stretching the tape as you apply it, as this can lead to peeling. For site (related) seamless joins, angle the ends at 45 degrees for a clean seam.

Along the threshold, install a threshold seal. Typically, they’re secured using hardware. Align the sweep with the bottom edge so it just touches the threshold without dragging. Mark the screw holes with a pencil, then pre-drill holes for better hold. Fasten it using the included hardware. Reposition the seal so that it seals tightly but still allows the door to open and close smoothly.

If there’s a gap beneath the door, consider adding a expandable threshold seal or a removable weatherbar. These install within the frame and compress when the door closes, creating a tight seal.

Once everything is installed, test the door by gently shutting it. Look for light leaks where drafts are detectable. If you find any, reapply the material or apply extra tape where needed. A subtle pressure when closing the door, which indicates a good seal.

Check the seal again after a few days, especially if the weather has changed. Thermal expansion can cause materials to adjust due to heat or cold, so a quick inspection ensures long-term performance. When done correctly, your new weatherstripping should remain effective for years and make your home cozier and quieter.