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June 11, 2014 / Zircon Corporation

The Secret to Finding Wood Studs in Lath and Plaster Walls

Zircon Tool Pro

We often get asked, why does my stud finder have trouble with lath and plaster when it works perfectly through drywall? Or, what is the best tool or technique for finding studs in lath and plaster walls?

The front of this lath and plaster wall is smooth - no problem for your stud finder. The front of this lath and plaster wall is smooth – no problem for your stud finder.

Your Zircon stud finder finds studs by looking for an increase in density compared to where it was first calibrated on the wall.  Drywall and other manufactured sheet materials have very consistent density, but lath and plaster walls have very inconsistent density on the backside of the wall. This is where the plaster is squeezed between the lath and ‘keys’ onto the back of the lath and holds the plaster in place.

So, even if the front of the wall has a very smooth texture, the back of the wall is what gives your stud finder…

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