Porta empenada pegando no chão: ajuste de dobradiça vs calço correto (sem lixar a porta)
If your door is rubbing the floor, you can usually fix it without sanding or planing. This guide shows how to diagnose the real cause (sagging hinges, loose screws, deep mortises, or minor warp) and choose between hinge/
- Diagnóstico rápido: por onde começar
- Hinge adjustment: when it’s the right first move
- Calço correto (hinge shimming): when shims beat “tightening”
- Choosing hinge adjustment vs calço (shims) vs “something else”
- Mistakes commonly make people reach for sandpaper too soon
- How to verify the fix (and so that it stays fixed)
- FAQ
- Referências
TL;DR
Most “warped” doors that hit the floor are really sagging on the hinge side. Start by tightening the screws and replacing one top-hinge screw in the jamb with a longer screw that reaches the framing behind it. Hinge shims are a good solution if the hinge mortise (the part of the door you set the hinge into) is too deep or if you need to adjust the angle of the hinge just a bit. Shimming can even lift a rubbing corner without adjusting the door’s edge. Making sure that you’ve diagnosed the issue and not just bandaged the symptom is key. Run your finger along the reveal (the visible edge of the door) and, at least test it out, to check for loose screws and cracks. Don’t do any sanding or planing until you’ve addressed what is wrong on the hinge side, because often it’s just the symptom of an issue.
Diagnóstico rápido: por onde começar
A door that looks warped and drags on the floor is a headache. It’s worse if you don’t want to sand, plane, or refinish it. Fortunately, in a lot of houses, the door slab is perfect. The door’s hanging at an incorrect angle because the hinge side has “sunk” (loose screws, compressed wood, or hinge mortises that aren’t deep enough). Check the reveal (gap) around the door: is the gap tight at the top latch-side corner? Is it wider on the hinge side than the latch side? Those patterns usually point to hinge-related sag, not a door-bottom problem.
Open the door halfway and lift up on the handle. If you feel noticeable movement, the hinge screws and/or jamb anchoring are likely part of the issue.
Look at the hinges: are there paint ridges, loose screws, or screws that spin without tightening? Those are immediate fix targets.
Hinge adjustment: when it’s the right first move
Think of “hinge adjustment” as correcting how the door is being held—not changing the door. Start here when the door used to work fine, the rubbing got worse gradually, and you can see or feel looseness at the hinges.
Step 1: Tighten screws (but do it strategically)
Support the door with a wedge under the latch-side bottom corner. Using the correct screwdriver bit, tighten all hinge screws on both the door side and jamb side. If any screw just spins, stop—don’t ‘strip it more.’ Jump to the stripped-hole fix below. Test the door. If the rub improved but isn’t gone, continue to the long-screw step.
Step 2: Replace one top-hinge jamb screw with a longer screw (common sag fix)
A classic cause of floor scraping is hinge-side sag: the top hinge area loosens, the door tilts, and the latch side drops. A longer screw in the top hinge (jamb side) can pull the jamb/hinge back toward the framing and re-lift the door’s latch-side corner—often without needing to make any other changes.
- Keep the door supported.
- On the TOP hinge, jamb side: remove ONE screw (ideally a screw closer to the doorstop side of the hinge leaf—where there’s a better chance of hitting framing).
- Drive a longer wood screw into that hole (commonly about 3 inches, but use what fits your wall depth and hardware). Pre-drill if needed so you don’t split the jamb.
- Tighten until snug—don’t crush the hinge leaf into the jamb. Then test the swing and the latch.
Step 3: Fix stripped screw holes (so your adjustment actually holds)
If screws won’t tighten, you can’t keep the door aligned. One dependable fix is to bore out the stripped holes, glue in wood dowels, then re-drill pilot holes and reinstall screws.
- Swing the hinge leaf away from the jamb so you can access the stripped holes.
- Drill out the damaged holes to a consistent diameter; glue in short dowels, and let the glue set.
- Drill new pilot holes and reinstall hinge screws.
Calço correto (hinge shimming): when shims beat “tightening”
Use hinge shims when the hinge leaf is sitting too deep (mortise cut too deep), or when you need a small, controlled change in the door’s angle that tightening alone can’t achieve. Shimming changes the hinge’s geometry; sanding changes the door. When you want “no sanding,” shimming is often the cleaner fix.
What to use as a shim (cardboard vs plastic vs metal)
- Cardboard: Great for tiny adjustments and quick testing, but it can compress over time
- Plastic hinge shims: Designed not to compress and often tapered for fine control; Fine Homebuilding highlights plastic shims as a durable alternative to cardboard.
- Metal shims: Common in commercial settings; the Steel Door Institute outlines shimming methods for hinge bind and clearance correction.
Shim placement: a practical way to think about it
A hinge shim behind ONE hinge leaf doesn’t just “move the door” sideways—it slightly rotates the door slab around the other hinges. That’s why shimming the top hinge can change what happens at the bottom corner (and vice versa).
| What you see | Likely issue | Shim strategy (typical) |
|---|---|---|
| Door scrapes the floor at the latch-side bottom corner | Door has sagged on hinges / hinge-side geometry is off | Start with hinge adjustment (tighten + long top-hinge screw). If still needed, add a thin shim at the bottom hinge (jamb side) to change the door angle slightly. |
| Door binds at the top latch-side corner (tight gap at top) | Sagging hinges or bent hinge leaf | Fix looseness first; if hinges are tight but fit is still off, use a thin shim or tweak a hinge knuckle (advanced). |
| Door binds on the hinge side (door edge hits jamb/stop near hinges) | Hinge mortise may be too deep (hinge leaf recessed too far) | Shim behind the hinge leaf to bring it out slightly. |
How to shim a butt hinge without removing the whole door
Use a wedge to keep the door supported so the hinge you’re working on isn’t under full load.
Pick ONE hinge to start (usually the top or bottom—depending on the rub pattern).
Loosen a few screws in the jamb leaf, or remove two. Leave one screw engaged to keep the hinge aligned.
Slip the shim in behind the hinge leaf (between hinge and jamb, or hinge and door). Plastic shims are frequently slotted/tapered so they are inserted without fully removing the hinge.
Retighten screws, trim any visible excess (if you’re using cardboard), and do a quick test of the door.
Repeat with another thin layer only if needed. Small changes, .002″, .003″ and the like, will quickly add up to .010″.
Choosing hinge adjustment vs calço (shims) vs “something else”
| If your door… | Do this first | If it still rubs… |
|---|---|---|
| Started rubbing gradually over months/years | Tighten screws + add a longer screw at the top hinge into framing | Repair stripped holes; then add a small hinge shim if the reveal is still uneven. |
| Has screws that spin and won’t tighten | Repair the stripped holes (dowel method) | Then re-check alignment and consider shimming. |
| Rubs on the hinge side even when screws are tight | Suspect hinge mortise depth; shim behind the hinge leaf | If extreme, the permanent fix is correcting the mortise depth (carpentry). |
| Rubs only after new flooring/threshold/rug was installed | Verify floor height change and clearances | You may need hinge-side corrections, but sometimes the floor change exceeds what hinges can compensate for (professional evaluation). |
Mistakes commonly make people reach for sandpaper too soon
- Sanding the bottom edge first. Most of the time with binding doors the problems start at the hinge side and sanding in many ways is just “fixing the symptom” not the cause. This mistake:
- Over-tightening long screws until the hinge leaf bends: That can introduce new binding.
- Using soft cardboard as a permanent shim in a high-use/heavy door: it might compress; use the purpose-made plastic shims instead for it to remain stable.
- Adjusting the strike plate to ‘force’ latching before fixing the hang: You might be masking a sagging issue and creating a new wear point. Hinge changes.
- Making several at once (then not knowing which one mattered).
How to verify the fix (and so that it stays fixed)
- Open/close the door 10–20 times: listen for scraping and keeping an eye on the bottom corner by the rub point.
- Check the reveal: You’re looking for an even (as that frame permits) gap around the entire slab to the stop.
- Latchcheck: You want said latch to be able to engage the strike without you having to lift/push on the door.
- Re-check the hinge screws after a day or two of normal use (especially if you repaired a hole or two and/or added shims).
It Really is a Warped Door (and what you can do without sanding)
Sometimes the slab truly warps (humidity swings are usually the culprit), and the door edge doesn’t meet the stop evenly. Even if this does not solve the problem, you may be able to avoid sanding by adjusting how the door meets the frame: small changes in the hinge-side, careful shimming, sometimes relocating the stop molding will allow the door to close with less effort—without pretending that you have a perfect slab. Fine Homebuilding says that when a door or frame warps, one response may be to “move the stop or refit hinge position, so that the door moves easily into the closing position.”
Note—If an exterior, fire-rated, or security door is woefully twisted, has major, uneven gaps, or has acquired a rotted complexion, it may take qualified hands to bring its posture nearer vertical,” Fine Homebuilding says. Some doors/frames exceed hinge and shim correction and require more skilled intervention.
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