Use a inch thick piece of steel that is larger than the doorframes width.
Mount safe to wood floor.
A safe is a natural deterrent to someone who has unlawfully entered your house.
Bolt the gun safe to the steel using the pre drilled holes at the bottom of the safe.
Hidden in the floor.
Another reason is that the floor itself is not suitable for bolting a safe to making safe owners seek an alternative.
Option no 2 get a very heavy safe.
The floor can t be wood.
How to secure a safe without bolting it to the floor while bolting a safe to the floor is common there are lots of reasons not to do this.
Next you ll have to see if the hole spacing in your safe allows you to mount to at least two joists.
If you don t have an alternative flooring than a floor boards why not consider chemical installation or if your safe has pre drilled holes at the back wall installation.
Pros on fitting the safe to the floor or wall.
How to reinforce a floor for a gun safe.
If you pick the right spot for your safe and affix it to the floor properly you will make sure would be burglars do not abscond with it.
Or you might be able to fasten a safe to floor joists with lag screws.
In the case of a small safe again one possible way to install it is in the floor.
It will be easy to hide.
Floor boards are not strong or thick enough to secure a safe and can make theft of your safe that little bit easier.
Place the slab where you want to mount the safe.
If you are renting you may not be allowed to bolt a safe to the floor.
If you have to install a safe on the floor how about sacrificing a cupboard somewhere and fix inside it a big and heavy concrete base and screw the safe on that.
This is a project you can do with a few tools and a bit of know how.
In my non expert opinion screws on wood would not be strong enough to withstand the pull of a large crowbar or a saw cutting around the base.
For additional security you can bolt the safe to your floor by securing it to a wood or concrete foundation with strong bolts.