In the process of removing the old tube and nobe electric in this 1935 house I didscovered the house used this rock type of "drywall" and had hardley any insulation in the walls. Since the "drywall" was a bitch to work with because if crumbbled I decided to take all of it down. I'm glad I did because I found several spots of rotting wood. Now I need to redo the insulation and think I've decided on mineral whool battinging to do the job. Most of the insulation that was fiberglass looked damaged when I pulled it out, so I'm concered about the new stuff getting wet. There seems to be none of the foamboard insulation on the outside of the house like I seem them use today. Basically it's the frame of the house then some vertical boards with 1/2" gaps between them, then this black paper, the original wood sideing and finally vinly siding ontop of the wood siding. I was planing on of just sealing the gaps with cans of spray foam. Will that be enough to protect the insulation or should I use some house wrap or something else for added protection from water and moisture? I live in Northeast Ohio so we get hot humid summers and cold wet winters.