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Re: electronic stud finder to detect roof joists?

Estes Wayne-W10191 wrote:

> Electronic stud finders detect a change in dielectric constant when you move the stud finder to an area that has a wooden stud behind the wall.  I'm curious if anybody on this list has successfully used an electronic stud finder to locate the joists under a roof.  I think the change in dielectric constant would be much more subtle when you have to sense through the thickness of the shingles and a layer of 1/2 inch plywood (composition shingles, not wood shingles).

As an owner of an 80-year-old house with lath-and-plaster walls, I can tell you
that electronic stud-finders *do not* work at my house. I think they are rather
finely tuned to the material of the wall...

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