Hi y’all. I just took the old ceiling out of my 2002 Chevy Express 1500 Explorer conversion van. The ceiling is constructed of masonite with a thin layer of foam between the fiberglass roof and the masonite ceiling. There are 4 light fixtures, 2 speakers, and 2 rectangular ducts that line the sides (between the foam and masonite) with four vents to blow AC and heat.
When we removed the ceiling, there are what look like scorch marks on the foam and the masonite. Could be water damage or age, but the masonite doesn’t look warped like I expect it would from water damage.
I suspect much of the issue is coming from the ducts based on the patterns, but even that isnt super clear. The foam right behind the speakers was pretty darkened as well. The fiberglass roof does not have these marks.
Does anyone have experience with this type of van, and seen this before? Is this just normal from the foam doing its job over the past 20 years insulating hot components? If so, do I need to replace the foam with a specific type of foam? Or will fire resistant (Class A) sheep’s wool work just as well?
Thanks in advance for any help. Photos attached.