Tony Hwang wrote:
mtco wrote:

What is the best way to find out the type and amount of insulation
installed inside an exterior wall? By "best" I mean minimum effort and
the least likelihood of the attempt turning into a big repair job.

The wall in question has drywall on the inside and vinyl sidings on the
outside.

Thanks in advance.
Hi,
Where do you live? This is first thing to consider. The location.

Pull the cover off a wall receptacle or switch and get a
flashlight...might be able to see the insulation where the switchbox or
receptacle box is not tight against the wall covering...you can poke
around in there with a coathanger and feel if there is any insulation
or if you mark the outline of the cover before removal you might be
able to shave off some of the drywall or the wood or whatever wall
covering you have to be able to see into the cavity next to the
electrical box.