Resources
How to Tell if a Door Was Installed Correctly
A properly installed exterior door has a 1/8-inch gap on all sides, sits plumb in its jamb, latches cleanly, and seals evenly against weather. At Zane's Door Replacement, we check the gap, level, hinge shimming, strike alignment, swing, threshold, and seal by hand at the opening. If it does not close properly, the jamb may not be set correctly.
You notice trouble in ordinary moments. The latch needs a lift, the top gap is wider than the bottom, or a draft comes through one side when the weather changes.
The Reveal
Start With an Even Gap Around the Slab
Look at the space between the slab and frame on the hinge side, latch side, and across the top. We look for a 1/8-inch gap on all sides. It should stay consistent and even.
A gap that pinches at one end and opens at the other can show that the jamb is not plumb. Uneven gaps often lead to binding, rubbing, or a latch that does not meet the strike plate as it should.
A 1/8-inch gap on all sides, consistent from top to bottom.
Swing and Latch
Whether the Door Stays Put and Latches
Open the entry partway, then let go. It should not swing open or closed by itself when the floor is level. Door manufacturers' own installation instructions call for the jamb to be set plumb for exactly this reason: a door hung out of plumb will drift on its own instead of staying where you leave it.
When a jamb is set out of plumb, the first issue we often see is poor closing. The latch may miss the strike plate, or the slab may press into the jamb before it reaches the closed position.
Check the lock too. A faulty locking mechanism needs attention.
Hinges and Shims
Hinges and Shims Keep the Jamb in Position
A prehung unit is a system. The slab, hinges, jamb, threshold, and trim work together, so changing only one part can leave the original problem in place.
Manufacturer installation guidance calls for shims behind the hinge and strike locations to keep the jamb straight while screws hold it securely. If a screw is over-tightened or the frame is not supported correctly, it can pull out of true. The result may be an uneven reveal, a warped slab, or poor alignment.
We check hinge shimming by hand at the opening. It needs to work without fighting the frame.
Weatherstripping and Threshold
Daylight or a Draft Points to a Poor Seal
Close the entry and look around its perimeter. The weatherstripping should meet the slab evenly. If you see daylight, feel a draft, or find one section barely touching, the jamb, threshold, or alignment may be off, a pattern documented in manufacturer installation guidance and in standard installation references like This Old House.
The door sill and threshold need to be properly coordinated with the jamb to ensure the seal performs as intended.
These signs move past cosmetic concerns
A faulty locking mechanism, a warped slab, or a structural fault in the jamb or casing is more than an appearance issue. The same applies when rot damage is visible at the opening.
We correct failed installation as part of a replacement. When the opening has decay or structural damage, we address that work before the new unit is set. For a closer look at damage around an opening, read Signs of Door Rot and Decay.
Before Anything Is Adjusted
Four Things to Photograph First
If you suspect bad installation, take clear photos before anything gets adjusted.
Those images help show where the issue is happening. We still inspect the opening in person, because a photo cannot show whether the jamb is plumb or what is happening behind the casing.
Scope of the Work
When It Is More Than a Small Fix
A door can look like it needs a small adjustment while the real issue is the jamb behind it. When that part has moved, warped, or deteriorated, adjusting the slab alone does not give you an entry that will keep operating correctly.
Redoing a door you already paid to install feels like paying twice. The cost worth weighing is the cost of leaving a badly set jamb in place, because that is the part that keeps the door from closing, locking, and sealing.
If an earlier installation needs correction, read how we correct a failed installation. Bryan Zane handles the estimate, measurement, ordering, and installation himself.
Related Reading
Keep Learning About the Opening in Front of You
For more than installation checks, visit our Resources page to keep learning about all the services offered here. You can also read about how weather exposure affects doors, door materials compared, and how much overhang an exterior door needs.
For licensing details behind our work, see what a door contractor license means.
Correcting a Failed Installation
If an earlier installation needs to be put right.
Signs of Door Rot and Decay
If the jamb, threshold, or surrounding wood concerns you.
How Much Overhang a Door Needs
If you are checking how sheltered the entry is.
Buying Your Own Door
If you are ordering a slab or pre-hung unit yourself.
Frequently Asked Questions