Door Drafty — frame, hinge, weatherstripping

Use only checks that match the exact appliance or system and its official guide.

1. Check 1

   Close and latch the exterior door normally, then inspect the full perimeter from inside for visible daylight, dust tracks, or a gap at the hinge side, strike side, head, threshold, or bottom corner. On a windy day, move a thin tissue near each seam without using a flame.

   Expected result: Movement at one seam localizes the leak; a uniform draft around the frame or a gap that changes when the door is lifted suggests alignment or frame movement rather than only worn weatherstripping.

   Next step: Mark the leaking section and continue with the paper compression and alignment checks. If the frame is visibly twisted or the door cannot latch, stop forcing it and arrange professional assessment.

   Why this matters

   Why: The leak location determines whether the next check is the door seal, bottom sweep, hinges and strike, or the rough opening behind trim.

2. Check 2

   With the door closed but not locked, place a strip of paper or a thin card between the door and jamb at several points, close the door, and gently pull. Repeat at the head and bottom where accessible without pinching fingers.

   Expected result: Paper that pulls out with little resistance identifies a weak compression zone; resistance all around but a draft at the threshold points more toward the bottom seal, threshold, or a gap outside the moving leaf.

   Next step: Use the weakest zone to choose the repair. Do not install a thicker seal until hinge, strike, and latch alignment have been checked, because excess compression can stop the door from closing.

   Why this matters

   Why: Uneven compression distinguishes a localized seal failure from a door that is generally out of alignment.

3. Check 3

   Open the door and inspect the visible hinge leaves, screws, knob or handle, strike plate, and latch alignment. Close the door slowly and watch whether the latch enters the strike cleanly or the slab shifts when lifted; do not remove trim or enlarge holes as a first step.

   Expected result: A loose hinge, loose hardware, a latch that misses the strike, or a door that drops can create a perimeter gap and poor seal even when the weatherstrip is new.

   Next step: Make only minor, appropriate hardware adjustments if the door remains square and operates smoothly. If the frame is damaged, the door binds, or adjustment cannot restore a clean latch, call a qualified door professional.

   Why this matters

   Why: The frame and moving hardware control how the weatherstrip compresses, so alignment is a prerequisite to a durable seal.

4. Check 4

   After alignment is acceptable, inspect the existing weatherstrip and bottom sweep for cracking, hardening, gaps at corners, missing sections, or a sweep that no longer reaches the threshold. Measure each side and the top or bottom before selecting a replacement profile.

   Expected result: Cracked or missing material supports replacement; a clean seal with a persistent draft at the fixed frame points to caulk, trim, or rough-opening sealing rather than another strip on the moving door.

   Next step: Install a compatible seal or sweep snugly according to its manufacturer's instructions, then close and reopen the door to confirm smooth operation and a continuous contact line. Do not force material into a gap that bows the frame.

   Why this matters

   Why: Weatherstripping seals the moving interface, while gaps behind trim are a separate air-sealing layer and need different material and skill.

5. Check 5

   Recheck the closed door on the same perimeter points after the adjustment or seal installation. Inspect the interior trim for a visible crack or gap, and note whether draft remains only behind trim, around a sill, or across the entire frame.

   Expected result: A continuous seal with no movement indicates the moving-door leak is addressed; a remaining fixed-frame gap, water damage, distorted jamb, or complicated trim indicates a deeper installation or weatherization issue.

   Next step: Use a qualified weatherization or door professional for behind-trim sealing, frame repair, lead-paint risk, or any door that still binds or will not latch securely.

   Why this matters

   Why: The final test verifies both reduced air infiltration and normal door operation rather than assuming a new strip solved every leak path.