What Is Hidden Pivot Hinge Alignment? (Gaps)
Hidden pivot hinge alignment means setting the pivot, frame, and door so the closed door has an even perimeter reveal and the door swings without rubbing. A 3 mm (⅛ in.) reveal with a ±1 mm finish tolerance is a possible target, not a code rule. The hinge maker’s instructions and local code govern the installation.
Budget depends on how much work the opening needs. A careful adjustment may cost little if the door, frame, and pivot are already compatible. New hardware, floor changes, or frame repairs add labor and material costs. Before buying a hinge, I check its installation template, load rating, and adjustment range against the actual door. A low-cost pivot that cannot support that door is not a saving.
Plan the Reveal, Door Mass, and Pivot Location
A reveal is the visible gap between a closed door and its frame or floor. A consistent reveal depends on the door, pivot, and opening working as one system. Set the target only after checking the hinge maker’s required gaps, the door’s dimensions and weight, and any code or listing that applies.
I start by recording the door’s height, width, thickness, mass, swing direction, and finish-floor level. I also identify the pivot model and whether the door is solid, glazed, or otherwise unusually heavy. Do not estimate capacity from a model name alone: the manufacturer’s rating must apply to the door’s actual size, weight, pivot position, and use.
A nominal 3 mm (⅛ in.) reveal with a ±1 mm target can help guide finish work. It is not a universal code clearance or a substitute for the hardware instructions. Some pivot systems require a different gap or have limited adjustment, so obtain the template and adjustment data before cutting pockets or fixing the frame.
| Item to confirm | What to check before installation |
|---|---|
| Pivot capacity | Rating for the door’s actual weight, width, height, pivot location, and duty cycle |
| Reveal | Manufacturer’s required gap and available adjustment range |
| Door and frame | Dimensions, material, stiffness, and condition |
| Floor | Finished height, level, and planned floor covering |
| Code needs | Accessibility, fire rating, and locally adopted requirements |
Check Swing, Floor, and Required Clear Opening
The opening sets the limits for the finished door. Plumb jambs, a level head, a flat floor, and a stiff frame help the door keep its alignment. Survey these conditions before placing the pivot, then confirm the intended clear opening and floor gap against the project’s code and hardware requirements.
Check each jamb with a level and check the head for level. Measure the floor along the door’s swing path; a high spot can cause rubbing even when the door looks well aligned while closed. Record the finished-floor height, including flooring that is not yet installed. The door’s bottom clearance must account for that final surface.
Where the 2010 ADA Standards apply, the clear opening must be at least 32 in. (815 mm) wide with the door open 90 degrees, measured between the door face and the stop. The clear opening height must be at least 80 in. (2030 mm). Check these dimensions with the actual door and hardware in place; a nominal door size does not establish clear width.
ADA Section 404.2.5 limits a threshold to ½ in. (13 mm). A change in level over ¼ in. (6.4 mm) must be beveled, with a slope no steeper than 1:2. These requirements apply where the ADA Standards govern. Confirm which standards and local rules apply to your project before setting the finished floor or threshold.
Install the Pivot and Adjust the Perimeter Gaps
The pivot transfers the door’s weight into its specified support. Correct alignment starts with accurate pockets and secure backing, not with forcing the door into position. Follow the supplied template and installation order, then make small adjustments within the hinge’s stated range while checking the door at more than one point in its swing.
- Mark pivot locations from the hinge template, not from an assumed centerline. Confirm the door and frame dimensions before drilling or routing.
- Check that the pivot attachment points have the backing and fasteners specified by the manufacturer. Do not rely on finish material alone for support.
- Install the frame-side and door-side parts in the prescribed order. Keep the pivot axis aligned as directed; a misplaced axis can cause binding or uneven gaps.
- Hang the door and make the manufacturer’s initial adjustments. Avoid using adjustment screws to compensate for a badly out-of-plumb frame or a weak attachment.
- Close the door and measure the reveal at the top, middle, and bottom on both sides. Record the results, adjust, then repeat.
- Slowly move the door through its full swing. Watch for contact at the floor, frame, stops, seals, and nearby trim. A closed-position reveal alone cannot show every clearance problem.
| Observation | Likely area to inspect | First response |
|---|---|---|
| Gap narrows from top to bottom | Frame plumb, pivot alignment, or door sag | Recheck plumb and pivot instructions |
| Door rubs only near one swing angle | Floor, trim, or pivot-axis location | Locate the contact point through the swing |
| Reveal is uneven but door moves freely | Frame position or permitted adjustment | Measure again and adjust within maker limits |
| Door drifts or fails to stay in position | Pivot setup, floor level, or specified hold-open behavior | Check the model instructions; do not assume all pivots self-center |
Do not enlarge a pocket or shift a pivot without checking the manufacturer’s limits. If the frame is out of square or the support is inadequate, correct that condition first. Forcing the door or over-adjusting can hide the cause without fixing it.
Verify Operation, Accessibility, and Any Fire Rating
Final checks happen after the door, flooring, trim, seals, and finish coats are in place. These items can change the working gap or clear opening. Test operation again, measure the required opening, and document the result. If the door is part of a rated assembly, the listing and applicable inspection rules take priority over a preferred visual reveal.
I use two practical installation scenarios to show why the order matters. These are worked examples, not reports of specific jobs.
In the first, a new floor covering raises the finished floor after the pivot is installed. The door clears the subfloor during early tests but rubs after flooring goes down. The fix is not automatically to trim the door: first verify the final floor height, the hinge’s permitted clearances, and the door’s listing, if any. This is why the finished-floor level belongs in the survey.
In the second, the top gap looks even, but the lower side gap closes as the door swings. Check the pivot axis, frame plumb, and door support, then locate the exact point of contact through the swing. A reveal measured only at the closed position would miss this problem. Correct the underlying alignment within the manufacturer’s instructions; do not treat a wider closed gap as proof that the door is properly supported.
For fire doors, NFPA 80 governs clearances for fire-door assemblies. Use the limits for the specific listed assembly and the edition adopted in your area. A visually uniform reveal does not authorize trimming, drilling, adding an unapproved concealed pivot, or changing a bottom gap. Such changes may conflict with the listing or applicable rules. Confirm the approved hardware and work with the authority having jurisdiction when required.
Diagnose Uneven Gaps Without Guesswork
A gap is a measurement, not a diagnosis. Uneven reveals can result from frame geometry, pivot placement, floor conditions, door sag, or hardware adjustment. Measure at repeatable points, compare the readings with the manufacturer’s limits, and change one variable at a time so you can tell whether the adjustment helped.
Use the same reference points each time: top, middle, and bottom of both vertical edges, plus the head and floor clearance. Note whether the door is closed or at a particular swing angle. If the gap changes as the door moves, record where contact begins and inspect the floor, trim, and pivot alignment at that position.
A useful sequence is:
- Confirm the door is the correct size and within the pivot’s rated capacity.
- Recheck jamb plumb, head level, frame stiffness, and finished-floor level.
- Check fasteners, backing, pivot location, and any visible movement at the attachment points.
- Make only adjustments described by the hinge maker, then repeat the measurements.
- If the cause remains unclear, stop before cutting or drilling further and consult the hardware maker or a qualified installer.
Conclusion and FAQ
Hidden pivot alignment is a measurement and support task, not just a way to make a door look seamless. Set the reveal from the hinge data, verify the opening and floor before cutting, and test the full swing after installation. Where accessibility or fire-door rules apply, confirm compliance independently of the visual gap.
Is a 3 mm reveal required for a hidden pivot door?
No. It can be a finish target, but it is not a universal code requirement. Follow the hinge maker’s required reveal and adjustment range.
Should the gap stay identical throughout the swing?
The closed-position reveal should meet the chosen target. Through the swing, the door must clear the frame, floor, trim, and other parts without binding. The visible gap may appear different as the door moves.
How do I measure an uneven reveal?
Measure at the top, middle, and bottom of both vertical edges with the door closed. Record the gaps, then check for contact through the full swing.
Can I adjust a pivot to fix a crooked frame?
Only within the hinge maker’s adjustment range. A badly out-of-plumb or weak frame should be corrected rather than concealed with excessive hardware adjustment.
How much weight can a hidden pivot hinge carry?
There is no safe universal figure. Confirm the rating for the actual door’s weight, width, height, pivot position, and duty cycle in the manufacturer’s data.
What clear width applies under the ADA Standards?
Where the 2010 ADA Standards apply, the clear opening is at least 32 in. (815 mm) with the door open 90 degrees, measured between the door face and stop.
What is the ADA minimum clear opening height?
Where the Standards apply, the clear opening height is at least 80 in. (2030 mm).
Can I trim a fire-rated door to improve the gap?
Do not trim or alter it unless the listed assembly and hardware instructions expressly allow the work. Check the applicable NFPA 80 requirements and confirm with the authority having jurisdiction.
When should I check the gaps again?
Recheck after flooring, casing, seals, and finish coats are installed. Those changes can affect clearance and operation.
What should I do if the door rubs only at one angle?
Locate the contact point and inspect the floor, trim, and pivot alignment at that position. Then follow the maker’s adjustment instructions rather than widening the closed reveal as a guess.
(This article was written by one of our staff writers, Garrett Vance. Visit our Meet the Team page.)
