Hey all,

I just picked up a 170B and want to go the "utility interior" route.

Quick question: beyond just "doing it right", why remove the old insulation adhesive at all of its going to be covered right back up with Selkirk or similar foam panels? Paint the bulkheads, stringers, etc, and then cover the old adhesive that you won't see anymore.

Simply wasn't sure if there was a functional reason like corrosion mitigation or something.

Thanks!

I'm sure you've experienced the concept of weight on paper vs weight on scales.
You've also probably read that most people consequently don't trust the factory original weights.
Rather than assume the factories just lie as they pump airplanes out, I tend to be of the mindset that most airplanes just have more 'negligible' weight changes than should be ignored. The worst culprit is weight that gets 'covered up' and is useless.
The black tar and glue goo weighs...
Most people will again say 'x' doesn't weigh much, I'll just drop a pound or two off my belt line, I'd say it all weighs something, why not do both?
Take care, Rob

Weight and corrosion. Weight previously addressed by Rob.
Cabin interiors, specifically the roof underside is one of the most corrosion prone areas due to condensation from moisture expelling occupants exacerbated by temperature deltas between the cabin interior and exterior ambient. Until all the adhesive is removed to expose the aluminum surface, one will never know what may be hidden under that seemingly innocuous thin layer of adhesive. Get it out of there, your mechanic will thank you, I believe you will sleep better knowing this area is corrosion free, weather it really was to begin with (highly unlikely) or you have to perform some corrosion control. The end result is a known entity that is easier to inspect in the future.

TR