A little while back i purchased a 100lb 6ft Thai bag from KOfightgear (awesome customer service and quality, highly recommended http://kofightgear.com/ ) Originally I had it hanging between 2 joists but ran into some problems, when I hit the bag the entire house would shake. Pictures were falling and if you stood directly above the bag it felt like the floor was dropping an inch. So I came up with this setup.
I added two 2x6's with one end sitting on top the frost wall as seen above, and the other ends sitting on top of the center beam. They are not touching the floor above and are only attached to the floor joists at one end with a threaded rod to stop them from sliding out. This way the 2x6's are free to flex or crook without affecting the rest of the house.
I put spacers and foam between the 2x6's and existing floor joists to prevent too much side to side movement
I hung the bag from a telepost plate that sits on top of the 2x6's to provide maximum clearance for the bag. (I also ended up having to shorten the chain and use quick chain links for the bag to fit) I recommend using a permanent strength threadlocker to prevent the nut holding the eye-bolt on the telepost plate from vibrating loose.
Here are some videos of the setup in action
I added two 2x6's with one end sitting on top the frost wall as seen above, and the other ends sitting on top of the center beam. They are not touching the floor above and are only attached to the floor joists at one end with a threaded rod to stop them from sliding out. This way the 2x6's are free to flex or crook without affecting the rest of the house.
I put spacers and foam between the 2x6's and existing floor joists to prevent too much side to side movement
I hung the bag from a telepost plate that sits on top of the 2x6's to provide maximum clearance for the bag. (I also ended up having to shorten the chain and use quick chain links for the bag to fit) I recommend using a permanent strength threadlocker to prevent the nut holding the eye-bolt on the telepost plate from vibrating loose.
Here are some videos of the setup in action
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