How to Repair Drywall Cracks in the Garage

Drywall in a garage leads a tough life. Constant temperature fluctuations, heavy vibrations from the door, and the occasional bump from a stray garden tool eventually force the paper to tear and the mud to crack. Because garages are often unfinished or subject to more humidity than living spaces, these cracks are practically inevitable. Fixing them properly is less about aesthetics and more about preventing moisture from working its way behind the panel. A well-repaired crack should be invisible once painted, providing a seamless surface that resists future shifting. Follow this process to ensure your patch holds up through the next season of temperature changes.

1. Carve a Clean Path. Use a utility knife to cut a shallow 'V' groove along the length of the crack. Remove any loose tape, crumbling gypsum, or debris from inside the gap to ensure the new compound can grip solid material.
2. Pack the Compound In. Press setting-type joint compound into the V-groove using a 4-inch drywall knife. Ensure the material is pushed deep into the crack without leaving large mounds on the surface.
3. Tape Before It Sets. Immediately lay fiberglass mesh tape over the wet compound, centering it over the crack. Press the tape firmly into the compound with your knife, smoothing it out so no bubbles remain.
4. Feather the Edges Smooth. After the first coat has set, apply a wider layer of compound over the tape using a 6-inch knife. Feather the edges by applying less pressure as you move away from the center of the patch.
5. Sand Flush and Smooth. Once completely dry, use a medium-grit sanding sponge to smooth the area. Check for high spots or ridges where your knife may have left tool marks.
6. Prime and Paint Over. Wipe away all dust with a tack cloth and apply a final thin skim coat if necessary, followed by a coat of high-quality interior primer. Once primed, finish with paint that matches the surrounding wall.