I have just completed reading this post. Took me a little while to get caught up to date; I can tell it's been quite the adventure!
I too am doing a pretty extensive rebuild of a 1987 Class A motorhome. Mine's a 37' Georgie Boy Encounter. I went down to the frame inside, but I haven't gone quite as far as you with this project, close, but not quite.
I admire your tenacity and appreciate all the details you provide. I've gotten some good information during the read. Like yourself, I am adding additional insulation as I put the coach back together. I used it last year for a place to sleep during a month-long job. I had the back bedroom area insulated,and the A/C going for comfort.
A question I have for you is in regards to adhesives you are using to laminate the insulation and plywood together. I noticed that you had primarily been using the Chemlink M1 adhesive, but it seems that you have been using a different adhesive here recently. Did you switch adhesives, and of so, what prompted the decision?
I have used a few different things with varying degrees of success. Lately I have used the water-based Weldwood contact cement. It's okay, but it is not a product that I am super on fire about. I was considering the Chemlink as something that might be better suited as I move forward.
What do you think?
I really appreciate the thread and sharing all your experience as you go along. I'm really looking forward to seeing you progress on the TPO roofing material. I had considered that myself, but ended up stripping the existing sheet aluminum and coating it with a 2-part liquid EPDM. I had filon siding that had delaminated badly in the back of the coach. I ended up removing the filon to a point just past the delamination, replacing the Luan below, and then using West System epoxy to re-laminate the filon.
I'm really looking forward to seeing you on the road with your new old motor home!
