Western Michigan HandymanThe four causes
If you're in Kalamazoo, Portage, or anywhere in Kalamazoo County, chances are your drywall is cracking from one of four things: humidity-driven seasonal movement, truss uplift in winter, settling in an older house, or basement moisture. Each one shows up at different spots on the wall, and each one calls for a different repair approach.
1. Seasonal humidity swings (the most common)
Michigan summers are humid; Michigan winters are the opposite — months of forced-air heat dry the indoor air way out. Drywall absorbs and releases moisture with the air, expanding and contracting just slightly each time. Over years, this seasonal cycling shows up as hairline cracks, especially at inside corners (where two walls meet) and ceiling-to-wall seams (where the ceiling meets the wall). It's the same swing that makes doors stick in July and close fine in January.
How to spot it: hairline cracks following the corner or seam, often barely visible with overhead light but obvious with side-light from a window. Usually appears in multiple corners simultaneously, not just one. The crack opens and closes seasonally — typically wider in the dry winter months, tighter in summer.
The fix: tape and mud the corner, prime, paint. We coat with a flexible paintable caulk under the new tape if the corner has been moving for a while, which slows the recurrence.
2. Truss uplift (the winter one)
In homes with truss roofs, the bottom chord of the truss spends winter buried in warm, dry attic insulation while the upper chords sit in cold, damp attic air. The moisture difference makes the upper chords expand, which bows the whole truss upward — lifting the ceiling off the interior walls, sometimes by close to half an inch. The signature is a crack or gap where the ceiling meets an interior wall near the middle of the house that opens in winter and closes back up in summer.
How to spot it: it's seasonal like humidity cracking, but it lives specifically at the ceiling line of interior walls — not at outside corners — and it's most dramatic in the coldest months.
The fix: truss uplift looks alarming but it's seasonal physics, not structural failure. The clean cosmetic fix is trim attached to the ceiling (not the wall) so it rides the movement, or a re-tape with a flexible corner treatment. Chasing it with rigid mud every winter is a losing game.
3. Settling in older homes (the Kalamazoo special)
A lot of central Kalamazoo's housing stock — Vine, Stuart, Westnedge Hill — went up in the early 1900s, and old houses move. Decades of freeze-thaw cycles work on foundations and framing, and renovations get layered over old structure. In these homes you'll see diagonal cracks running up from the corners of doors and windows, and in the oldest stock the "drywall" is often plaster, which cracks in its own spidery way.
How to spot it: diagonal cracks off door and window corners, doors that rub in the same corner of the house, cracked or bulging plaster. Settling cracks tend to be wider than humidity cracks and grow over time rather than cycling with the seasons.
The fix: patch, re-tape, skim, prime, paint — plaster repair is patch-and-skim work rather than tape-and-mud. If a crack keeps getting wider month over month, or doors stop latching, have the structure looked at before you spend on cosmetics — patching a still-moving crack is whack-a-mole.
4. Basement moisture (the stain, not the crack)
Unlike a lot of the country, Michigan homes have basements — and basements collect moisture. Humid summer air condenses on cool walls, gutters and grading push water at the foundation, and the occasional plumbing leak finds the finished side. On finished basement drywall this shows up as staining, bubbling paint, soft spots, or a musty smell, usually low on the wall.
How to spot it: discoloration or bulging near the floor line, paint that won't stay stuck, or a stain that comes back after you paint over it. A stain that keeps growing means the water source is still active.
The fix: water first, drywall second. Sort the source — gutters, grading, dehumidifier, plumbing — then cut out the damaged section, replace, prime with a stain-blocking primer, and repaint (see our drywall repair page for how that repair runs). If there's mold beyond a small surface spot, that's a remediation specialist's job before any cosmetic work.
When to call us vs. when to just paint
If your crack is hairline (you can barely see it), in just one or two spots, and not getting wider over time — caulking and painting is fine. Pick up a paintable elastomeric caulk at the hardware store and have at it.
Call a handyman (or call us, at (269) 568-3603) if any of these apply:
- The crack is wider than a credit card.
- It's diagonal from a door or window corner.
- It's getting wider month over month, not just seasonally.
- There's a stain or bulge — that's water damage, different problem.
- You have multiple cracks in the same room.
If it's diagonal AND steadily getting wider, get a structural evaluation first. We'll happily patch the crack after the structure's been looked at, but we don't want to patch something that's going to be pulled apart again in 6 months. For everything else, it's routine work — scope and estimate details are on our drywall repair in Kalamazoo page.