Blown insulation / Discussions

...insulation is inadequate. We have been told that blown-in insulation only works for empty walls - our walls have insulation but it does not seem to be enough. Is insulating from the outside by building out something we should consider exploring with a contractor? We have one brick wall and the rest is siding. It seems ...

...insulation between the joists, Im wondering if I can increase the insulation or if that is of no use since the stairwell is open.  Blowing cellulose overtop of fiberglass insulation is no problem, but you need to be very careful about how much insulation you blow in, and make sure don’t block your ventilation openings ...