I'm considering getting the walls of my 1950-ish house
insulated, and am leaning towards having a contractor inject
My worry is the wiring. As I see it, there just won't be
any way of getting additional wiring into the walls after
insulating, so I'd better get the wiring updated first.
This "old-work" wiring will include adding more outlets and
circuits and updating (grounding) old circuits, with minimal
sheetrock invasion. But this leaves the various cables
hanging rather loosely in the wall cavities, as I won't be
able to get in and staple them to the studs.
If I go the foam route, I'm assuming that the contractor
will be cutting some sort of access hole high up on the
wall, and then putting some sort of injection hose through
that opening, and down nearly to the floor-level, and then
raising it slowly as the foam is injected, to ensure that
there are minimal voids afterward.
So my question is, will the foaming process put any kind of
stresses on my new wiring?