Remove any insulation in the general area to make the bit easier to locate.
Finding inside of wall from attic.
One such tool is a stud finder.
A magnetic stud finder detects the metal nails in the wall studs.
Go into your attic and locate the source of the leak on the underside of the roof deck using the measurements taken from your home s living space.
If you know that you have a leak within a certain wall but are unaware of the precise location place the moisture meter at 5 or 6 different spots on the wall.
Go to the space into which the drill was boring.
Scan for moisture inside walls with a moisture meter.
Secure the box against the wall so the two holes are lined up.
Drill a small hole in the wall a few inches above your floor.
Not just inside your walls but inside of the wood itself.
Place a food scented trap inside the box and cover box with cellophane.
A moisture meter is a piece of equipment which when placed directly against a wall will analyze the moisture content of that wall.
If unable to locate the bit repeat the drilling process after moving to a spot a couple of inches away from the first hole.
Due to the triangular shape of all but flat roofs the rafters or joists will run.
An electronic stud finder produces a small electrical field which changes when it reaches a denser region of the wall like the area over a stud.
Drill the same size hold in a cardboard box.
These fixed points can be perpendicular exterior walls a fireplace chimney or other components that extend through the finished ceiling to the attic space or roof surface.
Look inside the attic if possible to identify the direction in which the rafters or joists travel.