Raise an Adjustable Entry Door Threshold
Those big screwheads in the threshold of a newer entry door aren’t just decorative; they raise or lower a narrow strip set in the threshold. So if you’ve noticed a draft under the door, try this: On a sunny day, turn off the lights and close nearby curtains. Lie down and look for daylight under the door. A sliver of light sneaking in at both corners of the door is normal. But if you see light between the threshold and the door, grab your screwdriver. Here’s how to raise the threshold.
Shim Gapping Doors
If you have big gaps along the latch side of your doors, they were probably prehung in their frames at the factory and installed as a unit. The installer should have adjusted the frame with shims to leave about a 1/8-in. gap along the latch side, about the thickness of two quarters (coins). Sometimes the gap is far too wide. Here’s how to shim gapping doors.