Why do small repairs around the house keep coming back?

A small repair that keeps coming back is often a sign that the cause is still there. The patch, the caulk or the screw did its job, but whatever damaged the spot the first time is still at work. Before you patch the same crack a third time, work out which of the usual causes it is. Most fall into five groups: water, seasonal movement, the wrong material for a joint that moves, poor prep, and a fastener that was never holding in the first place.

1. Water and humidity

Water is one of the most common causes of repeat repairs: the bathroom ceiling stain that returns, the window sill that rots again, the paint that bubbles in the same spot every spring. The EPA's guidance on mold puts it simply: "If you clean up the mold, but don't fix the water problem, then, most likely, the mold problem will come back."^[1] It adds: "Paint applied over moldy surfaces is likely to peel."^[1]

Inside, the target the EPA gives is to keep indoor relative humidity below 60 percent, ideally between 30 and 50 percent,^[1] and to dry wet materials within 24 to 48 hours of a leak or spill, which in most cases keeps mold from growing.^[1] Virginia Cooperative Extension's moisture checklist aims a little higher, for relative humidity of 40 to 55 percent^[2] in a comfortable, healthy house. A cheap humidity meter tells you where you stand, and a basement or closed-up room is the place to check first.

Outside, the source is often rain that is not being carried away. Fairfax County's soil and water conservation district says the land around the house should slope away from the foundation walls, ideally a 5% grade for ten feet,^[3] and that streaks or watermarks on gutters and erosion along the drip line are signs that gutters are overflowing.^[3] The Extension checklist also calls for at least 8 inches of clearance between the siding and the finished grade, landscaping included.^[2] Mulch piled up against siding or a door threshold keeps the wood wet. See why gutters overflow.

If mold covers more than about 10 square feet, or there has been a lot of water damage, the EPA points to its professional remediation guidance^[1] rather than a homeowner cleanup.

2. Seasonal movement

Wood, drywall and the framing behind them swell a little in humid months and shrink in dry, heated ones. A door that sticks every August and swings freely every January is moving, not failing. Masonite's interior door warranty says: "Slight expansion or contraction of door panels, jambs and slabs due to varying environmental conditions changes is considered normal and not a defect."^[4] It also notes that warping may occur, depending on the season and relative humidity, until doors become conditioned to the building,^[4] and its wood door guide tells installers to leave one-eighth of an inch between the door and jamb to allow for seasonal variance.^[5]

So bring the humidity down before you plane a sticking door. Take wood off only if it still binds in the dry season, and seal the planed edge afterward so it does not soak up moisture.

3. A rigid patch on a joint that moves

Cracks at drywall seams, at the corners of door and window openings, and where a wall meets a ceiling open and close with the seasons. Ordinary spackle is rigid, so it cracks again in the same line. A flexible patching compound such as DAP's Elastopatch is made for this: the maker describes a permanently flexible fill that lets the surface expand and contract without cracking,^[6] with one catch, that it is not sandable,^[6] so it has to be smoothed well while wet.

Caulk has the same problem. A bead stretched across a deep gap tears. DAP's instructions for its Dynaflex 800 sealant say that if a gap is more than 1/2 inch deep, push a foam backer rod in first^[8] so the sealant can flex properly.

4. Poor prep or too much filler at once

Filler packed in thick shrinks, cracks and falls out. DAP's instructions for its wood filler say that for damage deeper than 1/4 inch, apply the filler in layers and let each layer dry before the next.^[7] Paint and caulk also fail on dust, grease, soap film or damp surfaces, so clean and dry before you patch.

Around windows and doors, recurring peeling can be air rather than water. ENERGY STAR lists peeling paint around the window or door frame as one sign of air leaks around the trim,^[9] where warm, moist indoor air meets a cold gap.

5. A fastener that was never holding

The towel bar that pulls out of the wall, the hinge that loosens every few months, the shelf that sags again: often the screw is in drywall alone or in a stripped hole. Tightening it buys a few weeks. For a towel bar, a hinge or another light item, the fix is usually a longer screw into solid wood, a wall anchor made for that weight, or filling the stripped hole so the screw has fresh wood to bite.

A stair handrail or a guard is different. It has to hold a person who stumbles, so it needs a solid fixing into the wall framing or blocking behind it, not a drywall anchor. One that keeps working loose is a job for a pro.

Stop and call a pro if

• A crack keeps getting longer or wider, is wider at one end, or shows up in the foundation as well as inside.
• Several doors or windows start binding at the same time, or floors begin to slope.
• Wood around a window, door or sill is soft enough to push a screwdriver into, which may mean rot in the framing.
• A stain keeps coming back on a ceiling below a bathroom or roof, or mold covers more than a small patch.
• A stair handrail or guard keeps working loose or will not stay tight.

Getting help

A good handyman finds the cause before patching, and a quote should say what was found. See what a handyman costs in Virginia, the yearly home maintenance checklist that heads off many repeat repairs, browse small repairs, find handyman businesses around Blacksburg, or read the other handyman answers. When you are ready, describe the repair once and local businesses quote it.