I'm going to help a friend remove his whole house fan in the attic. Since the attic space is walkable, we need to patch the subfloor where the fan was. There is currently 2x6 joists exposed that can be seen from the 3'x3' hole where the fan is installed.
I was thinking about putting some 2x6 framing together with a framing nailer and using lag screws to tie into the existing joists on all sides. Is this the right way to go or should I be using joist hangers?