Hi!

Can anyone help me with a method to locate where the beams/wooden joists run in my 1920s house with wooden flooring? On top of the flooring, there is a plank floor in two layers, which seems to make it impossible to use a regular stud finder. I need to bolt a safe to the floor, so I have to find a stable anchor point to avoid just screwing the safe into a couple of thin boards with loose sand underneath...

Many thanks in advance!
 
A two-layer plank floor sounds quite stable in itself and you might use something that extends under the floor during installation, but one way to find the floor joists CAN be to use a strong neodymium magnet to locate the nail rows in the floor that mark the joist.

(If you have a layer of masonite in the floor with 1 million nails, this probably won't work....)
 
Thank you for the tip Ingenjören! I was looking (in vain) for nail heads on the planks to find the studs, but your method was much smarter!!
 
Thought the same thing as the engineer, there are drywall anchors that you fold out on the backside but they are no larger than M6.

You use the same type when securing sliding protection for a ladder against the roof. You drill a hole in the raw wood and fold in an anchor they are M8 or M10.
It's probably not weaker than screwing into the joist.
 
Exactly the one I meant, it should work.
 
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