- 5 hours ago
If your ceiling crack keeps coming back after you tape, fill, sand, and paint it, the problem may be movement—not a bad repair. This practical home-repair guide explains why ceiling cracks, ceiling seams, and wall seams can look alike but behave differently.
A one-time settling crack may stay fixed after a standard tape-and-fill repair, while a crack that opens and closes with the seasons signals ongoing movement. Learn how to recognize the difference before choosing how to repair a recurring drywall crack, so you can avoid repeating the same patching job. Useful for homeowners troubleshooting ceiling seam cracks, wall cracks, and seasonal drywall movement.
A one-time settling crack may stay fixed after a standard tape-and-fill repair, while a crack that opens and closes with the seasons signals ongoing movement. Learn how to recognize the difference before choosing how to repair a recurring drywall crack, so you can avoid repeating the same patching job. Useful for homeowners troubleshooting ceiling seam cracks, wall cracks, and seasonal drywall movement.
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00:00You have fixed this crack before. You scraped it. You taped it. You filled it. You sanded it.
00:06You painted it. And it looked perfect. It looked like it had never happened. And you were pleased
00:12with yourself for a whole season. Then the weather turned, and there it was again. The same line,
00:19in the same place, running along the same seam, as though somebody had drawn it back in with a
00:25pencil while you slept. And you are beginning to wonder whether you are doing it wrong.
00:31You are not. Or rather, you may be doing the repair perfectly and still getting this result,
00:38because there are two entirely different cracks in houses, and they look exactly alike,
00:44and the repair for one of them does nothing at all for the other. One kind opened once,
00:51a long time ago, when the house settled, and it has been sitting there ever since,
00:56doing nothing. That one you tape and fill, and it is gone for good. The other kind opens and closes
01:05with the seasons. Every winter it appears, and every summer it shuts. That one is not a fault in
01:12the plaster at all. That is the house moving, and filling it with something hard is like putting a
01:19stick in a gate to stop its swinging. So before you buy a thing, you want to know which one
01:26you
01:26have. And that costs nothing, and takes one season to find out. I am Elias Yoder. I farm in Lancaster
01:35County, Pennsylvania. My own walls are plaster, and always have been. But a man here does not go long
01:42without helping to finish somebody's house, and I have taped and skimmed a great deal of board
01:48on English places. I gathered the whole of it into a book at EliasYoder.com. The book is the long
01:57version. If you want it, it is there. I will not mention it again. My grandmother taught me this
02:05with a door, and she let me do the whole job wrong first. The door into her kitchen stuck every
02:12August.
02:12It had always stuck every August, and that year I was fourteen and full of myself, and I decided I
02:20would settle it once and for all. So I took it off its hinges and planed the latch edge down
02:26until it
02:27swung sweet and easy, and I hung it back and opened and shut it a dozen times, and it was
02:34perfect.
02:35She thanked me for it. At Christmas, I was standing in that kitchen, and there was a draft on my
02:42ankles,
02:42and I looked, and there was a gap along the edge of that door you could have posted a letter
02:47through.
02:49Daylight in the middle of the day, right down the side of it. She saw me looking at it, and
02:55she did
02:55not say a word about the wood I had taken off. She only asked me one question. She said,
03:02Did you fix the door, or did you fix August? You did not fix the door. You fixed August.
03:11Now let me tell you what is actually going on, because once you see it, the whole business becomes
03:17simple. Everything in a house that is made of wood takes on damp in the humid part of the year
03:24and gives it up in the dry part. It swells in summer and shrinks in winter. Every year,
03:31the whole of its life. That is not a fault. That is wood. And your ceiling and your walls are
03:40boards
03:40screwed onto that wood. So when the frame moves, the boards have to go somewhere, and they go at the
03:48weakest line, which is the seam between two sheets. That is why these cracks run dead straight, and why
03:56they turn up in the same place every time. You are not looking at a break. You are looking at
04:03a joint.
04:04There is one particular version of this that catches a great many people, and it is worth naming properly.
04:11In a house with roof trusses, the top part of the truss and the bottom part sit in different
04:17conditions, one up in a cold, dry attic, and one against a warm ceiling, and in the depths of winter
04:25that
04:26difference can lift the bottom of the truss slightly. The ceiling lifts with it, and a crack opens along
04:33the line where the ceiling meets the wall, right round the room. Then spring comes, and it closes up again.
04:41People fill that every single year, and it opens again every single year, and they think their house
04:49is falling down. It is not. That is a house doing exactly what it was built to do. And a
04:56third sort
04:57worth naming before the test, because it is the commonest of all, and it frightens people least once
05:03they know it. A new house, or a newly built addition, will crack in its first two or three years,
05:10no matter how well it was built. The timber in it is still drying out and losing the moisture it
05:16came
05:16with, and as it dries, it shrinks. That is settling, and it stops. Fill those once the house has had
05:24a
05:24couple of winters, and they will stay filled. Now the test, and it costs nothing at all. Go to the
05:32crack
05:32today. Lay a pencil across it, at right angles, and draw a line over the crack and out onto the
05:39sound
05:39plaster either side of it. Then write today's date beside it, right on the wall, small. Now leave it
05:48until the season has properly turned. If you are marking it now, look again in the depth of winter.
05:55If you mark it in winter, look in high summer. If your pencil line has pulled apart, the crack is
06:02moving, and you have the seasonal sort. If it is exactly as you drew it, the crack is dead, and
06:09it
06:09settled long ago, and you can repair it, and it will stay repaired. You can do the same with a
06:15smear of
06:16filler an inch wide across it, or with a short length of masking tape stuck across and left there.
06:23Whatever the season does to that smear is what the season is doing to your wall.
06:28And keep the date. That is the part people leave off, and it is the useful part, because in two
06:35years
06:36you will not remember whether you marked it in March or October, and without that, the line tells you
06:42nothing at all. Now, if it is dead, here is the repair, and it is not difficult. But before a
06:50scraper
06:50touches anything, one thing that is not optional. If that house or that ceiling dates from before
06:58about 1982, the joint compound and the texture in it may contain asbestos, and paint from before 1978
07:08may carry lead. A ceiling sitting there quietly is doing nobody any harm. Scraping it and sanding it is
07:16what puts that in the air, and you will be standing underneath it with your face up. If the house
07:23is old,
07:24have it tested before you take a scraper to it. On a modern ceiling, still wear a mask that seals
07:31to
07:31your face, goggles, and a hat you do not care about, and shut the door to the rest of the
07:37house. And work
07:39off a plank across two trestles or a low platform rather than a stepladder if you possibly can, because
07:46this is all above your head and you will be shuffling sideways the whole time. Right, the repair.
07:54First, scrape the crack back until everything loose is gone, and be harder about this than feels
08:01reasonable. Take off the loose texture, the loose paint, anything that lifts. If it is coming away,
08:09it was going to come away later, and mud laid over a loose edge cracks along that edge within the
08:15year.
08:17Run a knife blade along either side of the crack, and anything that lifts, lifts now rather than in
08:24March. And if the crack has been filled before, get the old filler out of it rather than laying new
08:31over old. Two repairs stacked on one another fail at the line between them.
08:38Second, tape the seam. Self-adhesive mesh tape is the easy answer. It sticks down on its own and saves
08:47you a step. Paper tape is the stronger of the two, and it wants a bed of compound under it,
08:53so it is more
08:54work, and it is what I would use on a wall corner that takes knocks. For a ceiling seam, mesh
09:01is fine.
09:02Lay the tape right along the line of the original seam, if you can see it, because that is where
09:08the old joint was, and it will hide best there. Third, the compound. And this is where people go
09:16wrong for want of knowing the difference between two things in the same aisle. There is the ready-mixed
09:23sort in a tub, and there is the powder you mix yourself, the sort sold as setting compound, with a
09:30number
09:31on the bag telling you how long you have. 20 minutes, 45, 90. The powder is not simply a dry
09:40version of the tub.
09:41It goes hard by a chemical set rather than by drying out, which means it does not shrink the way
09:47the tub
09:47does, and it will set even in a cold, damp room, and it is a great deal stronger. It also
09:54means it does
09:55not care whether you are finished. When the bag says 20 minutes, you have 20 minutes, and then it is
10:02stone
10:03in your pan whether you wanted it or not. So mix only what you can use. Powder in the pan,
10:11water in a
10:12little at a time, and stir it up to about the thickness of mayonnaise. Swirl it gently rather than
10:18beating it about, or you will have it over the floor, and work out the dry lumps. One more thing
10:25about
10:25mixing it, since it wastes more material than anything else. Mix in a clean pan with a clean knife every
10:34time. A scrap of set compound left in the corner of that pan will start the next batch going off
10:41early,
10:41and you will find yourself with 12 minutes instead of 20 and never know why. Scrape the pan out and
10:49wipe
10:49it between coats. Fourth, the first coat. Lay it over the tape in one smooth pass with a wide knife,
10:59then come back and lay the knife over at an angle on each side to press that edge down flat
11:05and feather
11:06it out into the ceiling. You want it thicker over the tape and thinner as it goes out. Fifth, and
11:14this
11:14is the tip worth the video. Do not wait for it to go rock hard before you touch it. Once
11:22it has set,
11:23but is still slightly damp, knock the ridges and the high edges off. It will come away easily then.
11:30Leave it a day and you will be sanding cured plaster over your head, which is miserable work and a
11:37room
11:37full of dust. Sixth, a second coat mixed thinner and on a seam that has given trouble before,
11:46I would do three rather than two. Sour cream rather than mayonnaise. Wider than the first,
11:53feathered further out. That coat is only there to bury the weave of the tape and blend the whole thing
12:00away. Each coat goes wider than the one under it, and that is the whole art of it. A repair
12:08shows
12:08because somebody stopped the mud at the same place three times and left a ridge. Go 8 inches on the
12:16first, 12 on the second, 16 on the third, and there is no edge anywhere for the light to find.
12:24Then sand it
12:25lightly with a damp sponge float if you can, which takes the edges off with hardly any dust at all.
12:32And check your work with a light before you prime. Set a lamp on the floor at one end of
12:39the room,
12:39and look along the ceiling. Every ridge and every mist edge will show in that low light,
12:47and it is a great deal easier to put right then than after two coats of paint.
12:527. Prime it. Bear compound drinks paint far faster than the painted ceiling around it,
13:00so paint straight onto it, and that patch will dry duller than everything else, and you will see the
13:07shape of your repair in a different sheen forever. And then the painting, which is where I have bad news.
13:148. Paint the whole ceiling. Corner to corner. I know. But a color matched white will not match,
13:23because there are a hundred whites, and yours has been up there fading gently for eleven years besides.
13:309. If you have the actual can it was painted with, you are in luck. If you do not, you
13:37are painting the ceiling,
13:38and it is better to know that before you start than to find it out after two coats on a
13:44patch.
13:4510. One more word on the tape, because people ask which to buy, and the answer is not the same
13:52for every job.
13:5311. Mesh is open, so the compound goes through it and grips the board on both sides, and it is
14:00quick,
14:01and it forgives a beginner. 12. Paper has no give at all, which is its strength,
14:07and it is what you want on an inside corner where two walls meet, or where a ceiling meets a
14:14wall,
14:14because it folds along a crease and holds that line dead straight. So mesh for a flat seam across
14:22a ceiling or a wall. 13. Paper for a corner. If you only ever buy one, buy paper and learn
14:31to bed it,
14:31and you will have the stronger joint every time.
14:3414. Now, what if the test says it is moving? Then do not fill it hard, because you will be
14:41back here
14:42next year. Where the crack runs along the join between the ceiling and the wall, the answer is
14:48a joint that can move. 14. Cut the loose material out, and run a bead of flexible decorator's caulk
14:55into that corner rather than compound. 15. Caulk stretches. Compound does not.
15:0115. The other answer, and the better one for a room you care about, is a molding round the top
15:07of the
15:08wall, fixed to the wall only and not to the ceiling. Then the ceiling can lift and settle behind it
15:15all
15:15winter and nobody ever sees a thing. And if it is a seam out in the middle of a ceiling
15:21that is genuinely
15:21moving, that wants somebody to look at what is holding it up. Which brings me to the limits.
15:29And do not simply caulk over a moving crack and paint it and call it done, because paint on flexible
15:36caulk
15:37will crack even when the caulk underneath has not. If you want it invisible, that is what the molding is
15:44for. If you are content with a line that flexes and shows a little, the caulk alone will do.
15:52There are cracks that are not a finishing job at all, and I want you to know them.
15:57A crack that runs in steps through brick or block following the mortar. A crack wider than a pencil.
16:05One where the two sides are no longer level with one another, so you can feel a step with your
16:11fingernail. Doors and windows in the same room that have started to stick or will not latch.
16:19Or a crack that is visibly getting longer month by month. Any of those, stop and have somebody who
16:27does foundations come and look. That is not money wasted even if the answer is that all is well,
16:34because you will have the answer. And a crack with a brown stain in it or round it is water,
16:41and there is no sense finishing anything under an active leak. Find that first.
16:47There is no scheme in any of this, and nobody arranged anything. The money simply runs the
16:55other way. There is tape and compound and caulk sold for this, and it is all fair work at a
17:02fair price,
17:03and the tradesmen who do it properly earn what they charge. It is only that nobody makes a living
17:10telling you to draw a pencil line across a crack and wait for the season to turn, so nobody says
17:17it,
17:17and a thing nobody has a reason to say gets forgotten inside of one generation.
17:23What got lost was not a product. It was a grandmother asking a boy whether he had fixed the door
17:31or fixed
17:32August. And one plain word about what all of this is worth. A hairline crack along a seam is the
17:41commonest thing in an American house, and it means almost nothing. Houses move. They have
17:48always moved. A house that never moved at all would be a house built so stiff that something
17:55worse would give instead. So do not lie awake over a pencil line on a ceiling. Mark it, watch it,
18:04and let it tell you what it is. So here is what I would have you do tonight, and it
18:10costs nothing
18:11whatever. Go to the crack that has been bothering you. Lay a pencil across it and draw a line over
18:18it
18:19and out onto the good plaster on both sides. Write the date beside it. That is the whole job tonight.
18:28In three months, that pencil line will tell you which of the two videos you actually needed,
18:34and you will not have spent a dollar finding out. So tell me in the comments whether your crack is
18:41one
18:41that has always been there, or one that comes and goes with the weather, because a good many of you
18:47already know the answer and have never thought of it as meaning anything. And if you have told me your
18:53county before, tell me this instead. Is your roof carried on trusses or on rafters, because that one
19:02answer explains a great many ceiling cracks all on its own. Next time I want to go under the house,
19:10because everything I have just described is the frame moving, and the frame stands on one piece
19:17of timber at the very bottom that nobody ever looks at. There is a five-minute check with a
19:23screwdriver and a flashlight that tells you whether the bottom of your house is sound or whether it is
19:30quietly going. You did not fix the door. You fixed August. The people who built this country with
19:38their hands knew that, and we are only just starting to remember it.