Magnetic screen door magnets not lining up

When the magnets on a magnetic screen door are not lining up, you can usually see the miss. One black strip sits a finger's width beside its partner, or the seam looks braided, with the left half crossing over the right and then back. The magnets are fine. They are being asked to grab a neighbor that is not in front of them.

Lining up is a geometry problem. The header sets the angle. The side tapes set the tension. The width of the mesh decides whether the halves overlap or strain. These are the misses we see most:

• The top is stuck on a slant, so the partners drift farther apart toward the floor.
• One half is twisted in the middle, and that stretch repels.
• The screen is too wide and the extra mesh is folded into the seam.
• The screen is too narrow and the sides are pulling the edges apart.
• Short magnet strips are sewn with gaps, so there is nothing to line up in the empty inches.
• A hem that pools on the threshold kicks the bottom magnets sideways.

Look at the seam the way the magnets do

Close the screen with your hands, gently, from the top down. Do not yank. Watch whether each bit of the edge wants the bit across from it. If the top clicks and the middle pushes back, stop. That push is a twist or a flip, and pressing harder will not teach it a new polarity.

Then let go and look from the side, at eye level with the middle of the door. You are checking overlap. A working seam overlaps a little, the way a jacket closes. Edge-to-edge with a dark line between them means they are short of each other. A thick rope of mesh means they are overlapping too far and the magnets are grabbing the wrong rank.

• Partners sit side by side the whole way down: the seam is shifted left or right. Recenter it.
• Partners meet at the top and separate in a wedge: the header is not level.
• A short stretch pops open when the rest is shut: that stretch is twisted.
• You can see plain mesh between magnet bumps: those bumps were sewn with gaps. Layout, not hang.
• The bottom pair sits on a fold: the screen is too long for this opening, or the top is mounted below the stop.

Count is a different question from lineup. Almost nobody publishes pounds of pull. Some listings describe magnets running the full length of the seam. Flux Phenom fiberglass screen (Amazon, opens in a new tab) is the competitor that publishes a count on the U.S. listing: 52 magnets sewn into the seam. A count does not guarantee they line up if the top is crooked. It does tell you the page is talking about a populated seam rather than a few dots. Read the live bullet. An Australia page for that same ASIN has also said 26.

Straighten the partners

1. Unstick the sides. Leave the top only if a level, or a long straight board, says it is actually level.
2. Lay the two halves together on the floor, outside the doorway, and zip the seam with your hands from top to bottom. This tells you whether the screen itself lines up before the door gets a vote.
3. If the floor test repels in one area, roll that half the other way and try again. The faces that attract are the faces that should meet in the door.
4. If the floor test lines up and the door does not, the door is the problem. Go back to the opening.
5. Mark the center of the header with a pencil dot you can wipe off, or a piece of tape. The seam belongs on that dot.
6. Stick the top so the seam starts on the dot and the strip is level. Press for a full pass.
7. Hang the sides with enough slack that the halves can overlap the way they did on the floor. Tight sides drag partners apart.
8. Walk through. Zip any spot that stayed open by smoothing it, not by adding a clip. A clip is a sign the hang is still wrong.

A fold in a too-wide screen is the lineup killer people try to solve with more tape. The extra inches have to live somewhere. If you tuck them into the seam, the magnets ride on a bump and grab the wrong spot. Flux Phenom fiberglass screen (Amazon, opens in a new tab) tells you to fold a smaller hem and tack it, and it also says that trick does not work on metal frames. Do not copy a tack fold onto a different brand unless that bag says you can. Folding through a full-length magnet seam can be the thing that makes the partners miss.

On wood, the push pins are for holding the frame of tape, not for pinning the seam shut. A pin through the middle will tear the mesh the first time someone walks through in a hurry.

When the seam itself cannot line up

Replace the screen when the floor test fails: magnets missing, a torn pocket, or a seam that repels no matter which way you turn it. Also replace it when the width is wrong and you have been folding mesh into the center to make it fit. For a 36 by 82 inch house door, we start with AUGO fiberglass screen (Amazon, opens in a new tab). The listing describes magnets that run the length of the center, which is the lineup we would rather hang than a row of short strips with daylight between them.

If you want a published count next to that full-length description, open Flux Phenom fiberglass screen (Amazon, opens in a new tab) and read the bullet on the page you are buying. AUGO stays our pick because the fit line and the seam layout are stated without making you reconcile two magnet counts. Flux stays in the conversation because a number is useful when you are comparing seams on paper.

• Re-measure before the new one arrives. Smallest width, shortest height.
• Hang top first, seam on the center mark, sides with slack.
• Do the floor zip once, out of the bag, so you know the new seam works before any tape is involved.
• Check the seam after the first hot afternoon. Tape that creeps will walk the partners apart again.