That interior door that glided smoothly in January now scrapes the jamb or sticks against the frame every August. You sand the edge, it works for a week, then sticks again. The root cause is not a carpenter error — it is plain wood physics. Solid wood doors absorb moisture from humid air and expand across the grain. A 30-inch wide pine door can gain up to 3/16 inch in width when relative humidity shifts from 30% to 70%. Hollow-core doors swell less but still bind. The fix that lasts requires measuring real clearance, planing the correct edge, sealing raw wood, and adjusting hinge depth. This article walks through each step with specific tools, measurements, and seasonal data so you fix it once.
Wood is hygroscopic. It gains and loses moisture until it reaches equilibrium with the surrounding air. Interior relative humidity in most North American homes ranges from 25% in winter (heated indoor air) to 65% or higher in humid summer months. According to the USDA Forest Products Lab, a 1% change in wood moisture content causes roughly a 0.25% dimensional change across the grain. For a 36-inch wide solid oak door, that translates to almost 1/8 inch of width change between winter and summer. Hollow-core doors use a veneer over a cardboard or foam core — the veneer still expands, but the core limits total movement to about half that of solid wood.
The sticking usually happens at the top or latch edge of the door, where the gap between door and jamb is smallest. The hinge side rarely binds because hinges hold that edge in place. The bottom can stick if the door swells downward (less common) or if the floor shifted. Before you reach for a plane, measure the gap in the sticking season — summer — and compare it to the non-sticking season. That difference is the actual seasonal movement. Write it down.
Interior door clearance standards from the National Wood Window and Door Association recommend a 1/8 inch gap around all edges except the bottom, which should be 1/2 to 3/4 inch to clear carpet or flooring. In practice, a door with a 1/16 inch gap on the latch side in winter will bind in summer if humidity rises. You need a minimum of 3/32 inch (about 0.09 inch) gap on the latch edge and top edge year-round to avoid binding in a typical climate. If your door has less than that in summer, you need to remove wood.
How to measure accurately:
If the tightest gap is less than 1/16 inch, planing is necessary. If it is between 1/16 and 3/32 inch, sanding may be enough if the door is hollow-core. If the gap is above 3/32 inch, the bind is likely from hinge misalignment or paint buildup, not swelling.
Planing removes wood faster and cleaner than sanding, but it requires a sharp tool and careful technique. Sanding works well for hollow-core doors (thin veneer, little material to remove) and for removing less than 1/32 inch. For solid wood doors needing 1/16 inch or more removal, a hand plane is faster and produces a straighter edge.
Tools and products mentioned:
Planing technique: Mark the exact line to plane with a pencil — do not remove more than 1/8 inch total. Clamp the door at a 45-degree angle on sawhorses. Plane from the outside edge toward the center to avoid splintering the veneer. For hollow-core doors, plane only the wood edge — stop as soon as you hit the inner core material (usually a cardboard honeycomb). Plane the latch edge only unless the top also binds. If you plane the top, remove the door from hinges and plan the top edge freehand. Work slowly, test-fit after every few passes.
Sanding technique: For veneer or thin adjustments, use 100-grit paper on a block. Sand the entire edge evenly, not just the sticking spot. Check with the caliper after every 20 strokes. Sand the edge to a slight taper if only one spot binds — remove 1/64 inch at the bind, feathering to zero over 6 inches.
The most common mistake: plane the door, rehang it, and leave the raw edge unsealed. Without a seal, that edge acts like a straw, sucking moisture straight into the wood grain. Within one humidity cycle, the door swells back to its original width and sticks worse than before because the planed surface now has even less clearance.
How to seal properly:
Once sealed, the door will still expand and contract, but the edge will not absorb moisture faster than the faces. The total seasonal movement drops to about 60% of unsealed wood. That is usually enough to keep the gap within tolerance.
Sometimes the door does not need trimming at all — the hinges are shimmed too deep (mortise too deep) or the hinge screws are loose. A door that gaps evenly on the latch side but still scrapes the jamb at the top corner may be racked (out of square) due to hinge settlement.
Diagnosis: Close the door and look at the gap along the hinge side. It should be even — about 1/16 inch from top to bottom. If the gap is wider at the top than the bottom, the top hinge needs adjustment. If the gap is even but the door scrapes the latch jamb at the middle only, the hinges are probably sitting too deep.
Adjustment steps:
If the door itself has adequate clearance (above 3/32 inch) but still rubs the jamb in one spot, the jamb may be swollen or the house foundation may have shifted. This is common in older homes with painted jambs where humidity has caused the jamb to cup or bow inward.
Test: Close the door and slide a piece of paper between the door and jamb. If you feel resistance at a specific point on the jamb but the door edge is straight (check with a straightedge), plane the jamb.
Jamb planing method: Use a sharp block plane set for a fine cut (0.005 inch depth). Mark the high spot on the jamb. Plane with the grain — most jambs run vertical. Remove no more than 1/16 inch total. Sand smooth and repaint the planed area. This avoids compromising the door's structural edge and preserves the original fit.
If the jamb is out of plumb by more than 1/8 inch, planing alone will not fix it — you need to shim the hinges or reset the jamb entirely. For a plumb jamb with a localized bulge, planing works well and takes 15 minutes.
Once you have corrected the current stick, you can slow future recurrence. Whole-house humidity control is the most effective long-term solution. Keeping interior relative humidity between 35% and 50% year-round limits wood movement to less than half of what it would be in uncontrolled conditions. A good HVAC humidistat (e.g., Aprilaire Model 60) costing around $150 will pay for itself in avoided door and trim repairs.
For new doors or replacements, choose engineered wood or hollow-core doors for rooms with high humidity swings (bathrooms, laundry rooms). Solid wood doors should have a factory-applied edge sealer — many builders skip this. If you are installing a new solid wood door, apply two coats of sealer to all six edges before hanging. This single step prevents 90% of seasonal binding issues.
If you recently fixed a door and it sticks again within a month, check for a leaking pipe or roof leak near that door. Localized moisture from a small leak can cause extreme swelling in a 2-foot radius. A moisture meter (General Tools MMD4E, about $30) can confirm if the door itself is wet — anything above 12% moisture content indicates a leak source.
A homeowner in Atlanta had a solid pine interior door that stuck every July through September. The gap on the latch edge measured 1/32 inch in August — barely a hair. The top gap was 1/16 inch. The door had been planed twice by previous owners, and both times it stuck again the next summer. The problem: neither planing job sealed the raw edge.
Using a Stanley No. 60 plane, I removed 1/16 inch from the latch edge and 1/32 inch from the top edge. Measured with a caliper, the new latch gap was 3/32 inch. Applied two coats of Zinsser Cover Stain, then one coat of satin latex matching the door. Final gap after paint dried: 5/32 inch (paint added about 1/64 inch). The door has not stuck in three subsequent summers. Summer indoor humidity in that house runs about 60% — no whole-house dehumidifier was installed. The edge seal alone stopped the cycle.
The total time: 90 minutes. Cost: $12 for primer and paint (already had the plane). Compared to replacing the door ($200–$400 plus labor), this fix is hard to beat.
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