[Shop-talk] Stud finder - squeaky floor

[Pat Horne]

Try tapping the floor w/a hammer moving over a few inches while listening to the tones. When away from support it will have a deeper tone, getting higher as you get to framing. Then you can drill holes until you find the edges. 

Removing the carpet first will help with the sound. 

Btw, when drilling holes, space the holes a couple inches apart until you find framing then go back 1". Is no framing, go ahead 1/2" & keep dividing until you find the edge. If backing up still shows framing, then go back 1/2", etc. 

Peace,
Pat

Pat Horne 
We support Caldwell County Habitat for Humanity


On May 2, 2017, at 5:02 PM, Karl Vacek <stearman809 at gmail.com> wrote:

Squeaky floors upstairs – not terrible for an 1871 house (moved, gutted, and rebuilt in 1951), but still it’s the time to address them before we replace the carpet.
 
I’m trying to locate floor joists beneath what I assume is a ¾” subfloor and ¾” of T&G fir flooring on top of that.  I really hate to rip up the nice fir flooring to look, though it’s going to have carpet again so it’s not out of the question.  All rock lath and plaster ceilings (about 1” total) below.
 
With the age of the house, stud and joist spacing is very unpredictable.  It’s not as if I can find one and measure to find the next one with any certainty.
 
I’ve tried stud finders many times before with our construction, and nothing has worked.  For walls I usually just drill tiny holes till I hit wood.  I tried a neighbor’s garden-variety Strait-Line electronic stud finder and it’s not capable.
 
Are there any really strong stud finders on the market today?
 
Or – any other ideas to quiet the floor?  Only a few spots actually squeak – it’s not all over.  I thought about injecting urethane glue (it expands with moisture) if I can find the joists, and then a few screws.  But where are the joists?
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