How to Check for Mold Inside Your Walls
Locate the center of the area most likely to have mold inside.Shut off power to the area at the electric service panel.With a pencil and straightedge, lightly mark a square approximately 6 inches by 6 inches.Cut along the outline with a drywall jab saw.Remove the cut-out and inspect its back for mold.If there is no insulation in the wall, look at the back wall. Also, hold a small mirror inside and shine a flashlight on the mirror to inspect the back of the drywall.If there is insulation, any mold on the drywall or studs will have spread to the insulation. So, the presence of mold on insulation usually means mold on other building materials. 
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