Some of these are a contractor’s responsibility, some belong to the framing, and some belong to the building itself. Knowing which is which is most of what a homeowner needs before an argument starts.
Nail pops and screw pops
Cause. Mostly framing drying out. Lumber delivered at up to about nineteen percent moisture content drops toward ten percent once a house has been through a heating season, and as the stud shrinks away from the board the fastener stays where it is and pushes the compound out. The board itself moves thousandths of an inch and is not the cause. The other contributors are loose attachment, framing out of alignment, a fastener longer than it needed to be, and a screw driven through the face paper so it never had holding power.
Fix. Drive a new fastener of the proper length about an inch and a half from the popped one, into the same framing member, pressing the board tight to the framing as you go. Then remove or reseat the popped fastener just below the face of the panel, and re-coat. A handful of pops in the first year after framing dries is normal and is not a workmanship defect. A systematic pattern of them is, and the place to look is fastener length and depth of drive.
Cracking at corners and openings
Cause. Stress concentrations. Cracks start at the corners of doors and windows, at the junction of a wall and a raked ceiling, and where framing changes direction. The usual contributors are a joint landing on the corner of an opening instead of being cut around it, a missing control joint on a long run, mesh tape used in an inside corner, and a heavy fill of drying-type compound that shrank.
Fix. Prevention is at layout and hang — board around openings, control joints where GA-216 calls for them, paper tape in every inside corner, setting compound in any heavy fill. Repairing an existing crack means opening it up, re-taping properly, and if there is no control joint on a thirty-foot-plus run, putting one in. Filling a moving crack with compound just relocates the argument.
Truss uplift
Cause. Not a drywall defect at all. In a truss roof over an insulated attic, the lower chord stays warm and the upper chords stay cold, and the resulting difference in moisture content arches the truss upward in winter and relaxes it in summer. That lifts the ceiling off the top plate of interior partitions. The crack appears at the wall and ceiling intersection of interior walls, opens in winter, closes in summer, and comes back every year no matter how many times it is patched.
Fix. Let it move rather than trying to hold it down. The building-science answer is a floating corner: keep ceiling fasteners well back from interior partition top plates — the published guidance is not closer than about eighteen inches — and use drywall clips so the board bends instead of cracking. Done that way there is no crack to repair. Explaining this before the ceiling goes up is a lot cheaper than explaining it every February.
Joint banding and joint photographing
Cause. Wide soft-edged bands appearing after painting, right where the seams are, usually ten to twenty inches wide. Most often it is a difference in sheen rather than color — it flashes when you look down the wall and vanishes head-on. The mechanism is differential porosity: the paper face and the joint compound drink paint at different rates, so the same paint dries to two different sheens. Skipping the primer, or using a low-solids two-in-one paint and primer that does not equalize the suction, is the usual trigger. On a wall that was always going to be dark or glossy, the real cause is upstream — the level was specified too low.
Fix. A high-solids pigmented drywall primer, back-rolled rather than only sprayed, so the whole surface reads as one material to the topcoat. Where the paint is non-flat or deep-tone or the light is critical, the durable fix is a Level 5, because it makes the surface literally one material instead of two.
Sanding through the face paper
Cause. The finisher sands past the compound and into the board's paper face, usually while trying to fix a coat that was too thin. Poor light while sanding and too aggressive a grit do the rest.
Fix. There is no shortcut: the area gets skimmed and re-sanded properly, and if it was found after painting, the paint gets redone. It is entirely preventable with a proper coat, lighter grit, lighter pressure and enough raking light to see the surface. We name it here because a homeowner who hears a contractor name it can tell the difference between a crew that knows what it is and a crew that will hand it to the painter.
Ridging and beading on a joint
Cause. A narrow hard raised line right down the center of a taped joint, distinct from banding — banding is a wide soft zone, this is a thin hard line you can feel with a fingertip. It usually turns up weeks or months later, most often on ceilings and long walls, and it is associated with moisture and dimensional movement in the joint.
Fix. Prevention: do not over-build the center of the joint, let every coat dry fully before the next, use setting compound for heavy fills, and respect the control joints. Repair means cutting the ridge back, re-coating wide and feathering it out much further than the original joint.
Ceiling sag
Cause. Almost always 1/2 inch regular board on framing 24 inches on center that then received a water-based texture. GA-216 does not permit it — a textured ceiling at that spacing needs sag-resistant ceiling board or 5/8 inch. The other cause is insulation loaded on top of the board beyond what the board is rated to carry.
Fix. Once board has sagged it does not come back; it gets replaced with the correct board. Before it happens it is a five-minute decision at takeoff, which is why we check ceiling framing spacing against board thickness before we order.
Butt-joint humps
Cause. The factory taper on the long edges gives a recess to fill. A cut end has no taper, so a butt joint has to be built out over a couple of feet on each side to read flat. Poorly executed butt joints are the most visible thing on a wall under raking light.
Fix. Solved at hang, not at finish: back-blocking or butt-board clips to pull a slight recess into the joint, or simply keeping butts off the critical walls in the layout. At finish the only tool left is building it out very wide, which works but costs more than doing it right at hang.
Corner bead cracking or popping
Cause. Nailed-on metal bead moving with the framing, or bead run over an out-of-plane corner and shimmed up with compound so there is a thick mass of mud waiting to crack.
Fix. Straighten the corner before the bead goes on. Paper-faced metal bead bedded in a full wet coat, or vinyl bead set in adhesive, largely eliminates it because nothing is fastened through the bead and nothing relies on a heavy fill.
