Fixing Bouncy Floors

Install a microlam beam, instead of the 2x10 beam and avoid the posts. Your building supply can order and size them to your needs. May require additional support at each end, but the center of the room would be open

"A beam made from two 2x12s should be supported by adjustable metal posts or 4x4 wood posts every 10 ft." No "adjustable column" of the type with sliding sections locked in place by pins as illustrated in the photograph above is listed for permanent use in the United States. see for example: http://www.octoberhome.com/articles/adjustcolumn/adjustcolumn.html Those need to be a correct type of adjustable column, and properly and secured the beam at the top and the footing at the base. Michael Thomas Paragon Property Services Inc., Chicago IL paragoninspects.com