Why won't your sliding door close the last inch?

The symptom

The sliding panel runs fine most of the way, then stops short of the frame. You have to push or lift it to close the last inch, or it will not close far enough to lock. This guide sorts out the likely causes and the checks you can do with the panel in place.

If the door is hard to move along its whole travel, start with why a sliding door is hard to open.

The short answer

Andersen says its gliding doors are designed to open and close easily with minimal force. When one will not close, it says to check that the panels are adjusted and installed as the instructions say. JELD-WEN's guides list the same kinds of cause. In plain terms, the panel is stopped by one of four things:

• Something in the track, or a dirty sill track.
• The weatherstrip, which is loose, damaged, or pushing back.
• Alignment. The panel no longer lines up with the frame or with the fixed panel where the two meet.
• The keeper or lock strike, the part on the frame that the lock hooks into, which is loose, damaged, or out of line.

What door makers list

JELD-WEN's vinyl patio door guide has a troubleshooting row for a panel that will not close. It lists:

• a dirty sill track (clean it, then lubricate it with silicone spray on a cloth);
• the panel locked (make sure the lock latch is in the unlocked position, then try again);
• obstructions, debris, or shipping blocks (remove them);
• a keeper that is loose or damaged (tighten it if loose, replace it if damaged);
• weatherstrip that is loose or damaged (reattach it if loose, replace it if damaged);
• panels that do not line up at the check (meeting) stiles, where the two panels meet (adjust the rollers);
• improper installation (inspect the installation).

Its wood patio door guide adds two more: lock strikes that are out of line, and a bowed frame. JELD-WEN asks owners to check each possible cause, including the installation, before contacting it.

The weatherstrip can push back

Andersen recommends keeping a gliding door closed and locked when you are not using it. It says that when the door is left unlocked, the weatherstrip may decompress (expand) and push the sliding panel slightly away from the side jamb, the upright side of the frame.

Andersen gives a newly installed door time for this. For a door installed in the last few months, it recommends keeping it closed and locked for the first 30 to 45 days while the new weatherstrip sets.

If the weatherstrip looks expanded and the panel does not glide easily, Andersen's next step is adjusting the panel's alignment. It says that is done with the panel closed and locked. This site leaves that adjustment to a technician.

Alignment and the lock

On Andersen doors with its reachout lock, locking pulls the panel into its seals. Andersen says its reachout lock pulls the sliding panel into the weatherstripping for a tight seal. When the door locks, a hook secures into the latch receiver on the frame or on a second door.

That is why closing and locking problems overlap. Andersen says locking hardware that is hard to operate or does not engage properly can mean the door is slightly out of alignment, or that the handle set needs replacing. After the rollers are adjusted, it says, the latch receiver may need adjusting too. And if the lock still does not fully engage after the hardware is adjusted, the rollers may need adjusting. The lock and handle repair page covers a lock that will not catch once the door is closed.

Andersen also points to the installation. If the problem remains after the panel is adjusted, it suggests having the installation checked, and offers to help find a service provider for that. JELD-WEN lists a bowed frame and improper installation among its causes.

What you can check safely

Each check is done with the panel in place. Do not lift the panel or take it out.

1. Look along the track and the frame. With the door open, look for anything in the sill track or against the jamb where the panel closes. JELD-WEN names obstructions, debris, and, on a new door, shipping blocks.
2. Clean the sill track. Andersen's method is a soft-bristle brush with warm, mild soapy water, a rinse with clean water, and letting the track dry before closing the door. Lubricant advice differs by maker. JELD-WEN lubricates its sill track with silicone spray on a cloth; Andersen says not to put lubricant on the track at all, because the rollers then slide instead of roll. Follow your own door's guide.
3. Check the lock latch. JELD-WEN lists a locked panel as one cause: make sure the lock latch is in the unlocked position, then try again.
4. Look at the weatherstrip. Check the strips along the edge of the panel that closes against the frame, and where the two panels meet. Note anything loose, torn, flattened, or bunched up.
5. Check the gap. Andersen's test: open the panel slightly, leaving a narrow gap to the frame, and look at the gap from top to bottom. If it is not even, the panel needs adjusting.
6. Look at the keeper. Find the keeper or strike on the frame where the lock meets it. Note whether it is loose, bent, or broken.

This site leaves roller adjustment to a technician. JELD-WEN's method has you lift the panel to take its weight off the roller, and it notes that adjusting the door too high may allow water and air leakage. Its vinyl guide marks taking out the sliding panel "For Professionals Only" and warns that panel removal can be awkward and could cause physical injury or product damage.

When to ask for a repair

Ask for help in any of these cases:

• the track is clean and nothing is in the way, but the door still stops short;
• the gap between the panel and the frame is not even from top to bottom;
• the two panels do not line up where they meet;
• the keeper or strike is loose, bent, or broken;
• the weatherstrip is torn, missing, or bunched up;
• the door closes but will not lock;
• you have to force the panel to close.

What a technician does

A technician starts with what you saw: where the panel stops and how hard you have to push. The track and the closing edge are cleaned and checked. The panel is set so that it lines up with the frame and with the fixed panel; for panels that do not line up where they meet, JELD-WEN's remedy is adjusting the rollers. The keeper or strike is tightened, realigned, or replaced, and the lock is checked. Worn or damaged weatherstrip is replaced. If the frame itself is out of line, the technician says so; that is a question about the installation.

Where to go next

• The alignment page covers a panel that sits crooked or out of adjustment.
• The roller repair page covers worn and badly adjusted rollers.
• If air comes in at a bottom corner when the door is closed, read drafts at the bottom corner.
• If it is the screen door that sticks or comes off its track, read sliding screen door off its track.

To ask about a repair in Plano, Allen, McKinney, or Frisco, describe where the door stops on the contact page. The photo guide lists what to photograph first. The operator reviews every inquiry and replies with the next step. Sending the form is not a booking.