Here is what an expert on the subject recomends.
https://gunsafereviewsguy.com/articles/ ... -gun-safe/ "Floor to Support a Gun Safe
Floor Load
Structures are rated by two types of weights: dead or static loads and live loads. Live loads, like people, move around and are much more restricted than dead loads. Fortunately a gun safe weight is a dead load.
Generally if a gun safe is to be installed on an upper floor the weight should be kept to 1000 lbs or less. Many floors will hold significantly more, but this needs to be established by inspection prior to purchase. If you’re buying a safe more than 1000 lbs, you’re probably going through a safe dealer who can do this for you.
To calculate the load bearing capability of your floor, you’re going to need to know the effective size, type/material, and spacing of the floor joists. Note what’s important is effective size. Over the years it is not uncommon for floor joists to be notched out improperly (on the top or bottom instead of the middle) for HVAC, plumbing, and electrical work. If your 2 x 10 floor joist had 3″ notched out of the top for a bathroom remodel, that joist is now effectively a 2 x 7. On masonry exterior houses, the wood floor joists may be notched down a couple inches to fit over the outside brick ledge. Once you have the dimensions you can consult a carpenter, or use an online calculator, to get the load capacity of your floor. "
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