How to Choose Weatherstripping

A drafty door or window can quietly leak 10–15% of your heating and cooling out of the house — and the fix costs less than a takeout dinner. The catch is that weatherstripping isn’t one product; the right material depends on the gap, the surface, and how much the part moves.

Start with where the draft is

Weatherstripping seals two kinds of gaps: the compression gap where a door or sash presses shut, and the sliding gap where a window or patio door glides past a frame. Compression gaps forgive thick, springy materials; sliding gaps need something low-friction that won’t peel off after fifty passes. Before you buy anything, run your hand around the frame on a windy day — or hold a lit incense stick and watch where the smoke bends. That tells you which edges leak and roughly how wide the gap is.

Measure the gap with a folded piece of paper or a coin: a nickel is about 2mm, a stack of two quarters about 3.5mm. Buy weatherstripping rated for a range that includes your gap, not exactly at the edge of it — material that’s too thin won’t touch, and too thick will keep the door from latching.

The main material types, compared

The weatherstripping and threshold aisle can look overwhelming, but nearly everything falls into six families. Here’s how they stack up for the jobs most homeowners face.

Tip: for exterior use, always choose EPDM or silicone over foam or felt. Sun and rain chew through open-cell foam in a season or two, and felt wicks water straight into your frame.

Doors: seal the sides, then the bottom

An entry door has two separate battles. The sides and top seal against the stop with compression weatherstripping — V-seal or a kerf-in bulb if your frame has the slot for it. The bottom is where the real money leaks, and it needs a sweep (attaches to the door face) or a threshold seal (a replaceable vinyl insert in an aluminum saddle). Brands like Frost King, M-D Building Products, and Thermwell make complete kits sized to standard 36-inch doors.

While you’re at the door, check that it still latches firmly — a door that no longer pulls tight against the seal is a hardware problem, not a weatherstripping one. If the strike plate or deadbolt is worn, browse door hardware and deadbolts so the door closes snug against your new seal.

Windows, sliders, and the garage

Double-hung windows love V-seal tucked into the sash channels; casement windows take a compression bulb on the frame. For drafty single-pane windows in winter, a shrink-film window insulation kit adds a near-invisible second glazing layer for a few dollars a window — pair it with V-seal for the best result.

Garage doors are their own animal: the bottom uses a wide T- or P-profile rubber gasket, and the sides and top use a nail-on brush or vinyl flap. Look in garage door hardware and screen and storm door hardware for profiles that match your track. And don’t forget the sneaky leaks: gaps around pipes and outdoor faucets seal with pipe wrap and faucet covers, while bigger holes in the building envelope call for insulation and building wrap or a bead of caulk.

Installing it so it actually lasts

• Clean first. Adhesive weatherstripping only sticks to a clean, dry, above-50°F surface. Wipe with rubbing alcohol and let it flash off.
• Measure and cut in place. Run the strip to the corner, mark, then cut — don’t eyeball it off the roll.
• Don’t stretch it. Pulling adhesive foam as you press it down makes it shrink back and gap within weeks.
• Test the close. Shut the door or window before the adhesive fully cures. Too tight? Step down one thickness.
• Nail the high-wear pieces. Door sweeps and tubular bulbs on entry doors hold far longer screwed or nailed than stuck.

Pick by your situation

Frequently asked questions

Sealing a house is one of the highest-payback projects you can do, and it’s the kind of job where a few minutes of advice saves a wasted trip. Take your gap measurements to your local independent hardware store and match the profile in person, or ask us here and we’ll point you to the right seal.