Wayne Parham Messages: 18792 Registered: January 2001
Illuminati (33rd Degree)
I use white glue. Works perfectly. You might think it would tear away, but I've had speakers out there like that for decades, some that have been moved a lot. So it works well.
Cut a sheet of insulation to size, take the vapor barrier backing off, run a long beads all around on the surface of the wood you want to attach the insulation to. Then just press it into place.
At one time I tacked the insulation in with staples. It's fast and easy. But occasionally the staples come out over time, and you'll find them stuck to a magnet or bouncing around inside, even worse. That caused me to rethink the staples idea, and I never do it that way anymore. It's easier to tack in the insulation with a staple gun, but I don't think it's as good as white glue.