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How to Weatherstrip a Door

Weatherstripping old entry doors is simple and inexpensive, but there are a few tricks of the trade that will make the installation trouble-free.

By the DIY experts of The Family Handyman Magazine

Keep your house warm

Feeling a winter chill? If you run your hand around the perimeter of your closed door and feel a cool draft, your weatherstripping is probably worn, cracked or deformed.

Maintaining an airtight seal on your doors and windows is essential for stopping cold drafts and keeping your home comfortable. And in older, leaky homes, it actually can be a good money-saving strategy.

Replacing weatherstripping on newer windows and doors (less than about 35 years old) is fairly easy. You can usually slide out the old weatherstripping and push or slide new vinyl or foam into the grooves in the door or the surrounding frame. The biggest hassle is finding replacement weatherstripping that exactly matches the old. See “How to Buy Weatherstripping,” below, for advice.

Older windows, especially double-hung windows, are difficult to weatherstrip. If they're in bad shape, consider replacement windows.

Installing new weatherstripping on older doors (and doors for which you can't find replacement weatherstripping) is fairly easy, and we'll show you how to do it in this article. Weatherstripping kits are available at hardware stores and home centers. They include two side strips, a top strip and fasteners.

We'll also show you how to install a door sweep to stop drafts from coming under the door. A wide variety of these are usually available on the hardware store or home center shelf alongside weatherstripping.

Size up your leaky door

We decided not to replace the old, worn bronze weatherstripping on our door with new bronze because the project is difficult, especially around the latch plates. (You can still find several types of replacement bronze at full-service hardware stores.) The wrapped foam type shown here is easier to install and more effective. We later painted the wood flange to blend with the frame.

Before you go out to buy your materials, check the door to make sure the draft isn't caused by loose hinge screws (Photo 1). If the screws no longer bite, you may have to glue wood plugs in the holes and redrive the screws.

Common weatherstripping types.

Common weatherstripping types.

How to buy Weatherstripping

You can usually find the types of weatherstripping shown below at well-stocked hardware stores and home centers. Many other types are available, but you'll probably have to order them from a catalog. Ask to see a catalog at your local hardware store and order through the store if possible.

We like the wrapped foam type (A and B in the photo, and used in our story). It's durable, retains its shape, withstands abrasions and conforms to a wide range of gaps. The metal flange with slots for screws (B) is a bit more adjustable than the nail-on wood flange type (A).

The vinyl or silicone bulb type (C) won't cover wide gaps as well as wrapped foam, but it has a smaller profile with a cleaner look.

Finding new weatherstripping to match the exact profile of the old can be difficult. If you know the door manufacturer or where the door was purchased, try there first. (Check the door and frame for a label.) Otherwise, call a local door or window repair service. It may stock the materials or tell you where to call. Replacement kits for the wrapped foam and magnetic (for steel doors) types are sometimes available at hardware stores and home centers, or check online.

Cut and nail – this stuff goes up fast

The weatherstripping kit will come with two long pieces for the side jambs and a short piece for the top jamb. Begin with the top and follow Photos 2 – 7 for the basics. Make precise measurements and cuts so you get nice, airtight fits (Photos 2 and 3).

Position the nails about 2 in. in from each end (to avoid splitting), and space others about every 12 in.

The key to positioning the new weatherstripping is to shove it against the door so it compresses slightly along its entire length (Photo 4). If you compress it too much, the door won't latch when you close it, a common rookie mistake.

The “coped” cuts on the side jambs make a clean, tight joint (Photo 6). Make this cut first, leaving plenty of length for the bottom cut.

It's critical to make sure that the door shuts and latches easily before you drive the nails home (Photo 7). However, the weatherstripping also needs to fit snug to the door over its full length. For small adjustments, pull the nails and start them in a new spot.

Tip: When you paint the wood flange, keep the paint off the foam.

Install a door sweep

Shut the door, then look for daylight and feel for a draft coming under the door. If you see a lot of light or feel a draft, install a new door sweep.

Our door had old bulb-type weatherstripping attached to the threshold. While these types can be effective, you have to replace them every few years because foot traffic wears and crushes them.

Door sweeps last longer, but won't always work if they brush or rub against the floor or carpet when you open the door. If the floor, carpet or rug is even with or higher than your threshold (the bottom of the door frame; Photos 8 and 11), you can't use a sweep.

For a replacement, we chose a simple face-mount door sweep with a flexible vinyl flap because it's easy to mount and adjust. Photos 8 – 11 show you how to measure, cut and screw it to the door.

You'll be left with a pair of small gaps between the weatherstripping on the frame and the sweep, at the bottom corners of the door. Photo 12 shows one way to close them. It's not precise; use whatever thickness of felt (or combination of layers) fits between the door and frame without hindering the door operation.

Good work! You can look forward to a more comfortable winter.

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Required Tools for this Project

Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.

    • Hammer
    • Coping saw
    • Cordless drill
    • 4-in-1 screwdriver
    • Drill bit set
    • Hacksaw
    • Utility knife

You'll also need scissors.

Required Materials for this Project

Avoid last-minute shopping trips by having all your materials ready ahead of time. Here's a list.

    • Weatherstripping kit
    • Door sweep
    • 4d finish nails
    • Felt

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