On Oct 13, 9:26 am, "Scramblur" wrote:
Hello all,

I just setup a new entertainment center in my home. The home is from
the 50's and has wood floors. The ent center is big and heavy. When I
walk through the entrance way, that is about 4 feet from the ent
center, stepping on a certain area, about 2 square feet in size, causes
the entertainment center to shake. The unit is not off blanace, I
cannot shake it by hand myself, but if I was to hop in this one area,
the unit shakes a lot. Even when my 35 lb dog walks thorugh this area,
the system vibrates a lot.

Any suggestion as to what is going on here and how I can possilby fix
it?

It's tough to eliminate all of the rattling caused by floor flexing.
The stiffer the floor, the less rattling, but there's almost always
some deflection and some rattling. If you have access from below, you
could investigate nailing and gluing another joist to the sides of the
existing joists in the affected areas - called sistering or sistered
joists. The new piece doesn't have to extend the full length, but the
closer the ends of the sistered joists are to the joist supports, the
better.

Another way would be to glue and screw a sheet of 3/4" plywood to the
underside of the existing joists. That will force the neighboring
joists to assist in sharing the load, stiffen the floor and dampen some
of the vibrations. This method would probably be my first choice. You
could test it with screws on 6" centers before committing to the
installation by gluing it.

R