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Re: electronic stud finder to detect roof joists?



My Sears unit has two modes, a normal and a sensitive
mode. I did use it for this very same purpose and it
worked ok in the sensitive mdoe - just try to stay
away from roofing nails.

Denny
WB8K
--- Estes Wayne-W10191 <W10191@motorola.com> wrote:
> This spring I will take down all my roof antennas in
> order to get a new roof installed.  When I put the
> roof tripods back up, I want to ensure that the lag
> bolts engage the roof joists whenever possible, not
> just the plywood roof sheathing.  One tripod will be
> in an area where there is no attic underneath
> because of a cathedral ceiling.  Consequently, I
> don't have the option to add any reinforcement from
> underneath the roof.
> 
> 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).
> 
> I suppose I could just buy an electronic stud finder
> and return it if it doesn't work.  But it would be
> nice to know in advance if it's likely to work.
> 
> Wayne Estes W9AE
> Mundelein, IL, USA
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