OK, here goes. Up under my patio awning where the fiberglass goes under the awning flex key channel, what is behind the fiberglass?<br/>Glass insulation? Foam insulation? The steel tubing?<br/>If I drill a 1/2" diameter hole about 1/2" below the flex key channel for an electrical wire, what may I run into?<br/>Remember, this is a 1989 coach. It does not have all the fancy stuff the...