Depends.

We always add 2 extra joists under refrigerators just because kitchen floors often have tile flooring and cannot sag without cracking the tile.

However, depending on the span of the joists, the floor could easily support such a load. Floors are designed for 40 lbs. per square foot (psf) so if you add up all the tributary area around the safe, I’m sure it could easily support the safe…if the floor system was originally designed correctly.

Often the bearing walls for floor joists are not spaced equally across the entire house. So, we design for the “critical” span (the longest span) and make all the joists the same size. You could easily check to see if your safe will rest on a large span or short span. (Note: If the span is extra short, they may have switched from 16” on center to 24” on center. )

The weak spot might be where the legs rest between the joists. You might add a 2x4 plate under the legs to help the subfloor.

Depends.

We always add 2 extra joists under refrigerators just because kitchen floors often have tile flooring and cannot sag without cracking the tile.

However, depending on the span of the joists, the floor could easily support such a load. Floors are designed for 40 lbs. per square foot (psf) so if you add up all the tributary area (the area including to the nearest joists) around the safe, I’m sure it could easily support the safe…if the floor system was originally designed correctly.

Often the bearing walls for floor joists are not spaced equally across the entire house. So, we design for the “critical” span (the longest span) and make all the joists the same size. You could easily check to see if your safe will rest on a large span or short span. (Note: If the span is extra short, they may have switched from 16” on center to 24” on center. )

The weak spot might be where the legs rest between the joists. You might add a 2x4 plate under the legs to help the subfloor.