You want to locate a floor joist or two---
First go to the basement and measure the spacing on the ones down there---typically they are 16" or 24" apart---
It's pretty safe to guess that the spacing will be the same upstairs---
Then start looking for something that needs a joist bay for a chase---that will usually be a floor vent for heat--or even a wall vent for return air---remove the vent cover and poke a wire into a gap to see if you can feel the joist on either side----
then it's just a matter of math to find the joists in the location for the safe---
Or just use large wing bolts and forget about the joists---
First go to the basement and measure the spacing on the ones down there---typically they are 16" or 24" apart---
It's pretty safe to guess that the spacing will be the same upstairs---
Then start looking for something that needs a joist bay for a chase---that will usually be a floor vent for heat--or even a wall vent for return air---remove the vent cover and poke a wire into a gap to see if you can feel the joist on either side----
then it's just a matter of math to find the joists in the location for the safe---
Or just use large wing bolts and forget about the joists---
