Having natural insulation was important to me, and I initially wanted to find cellulose batts, but they are next to impossible to find nowadays. So I decided on rockwool mineral insulation. Mineral wool is formed by spinning molten mineral or rock materials. It has excellent indoor-air quality; is resistant to rot, mildew, mold, and bacterial growth; doesn't itch; is completely resistant to fire and rodents; is sound-absorbing and heat insulating; and has a higher R-value than fiberglass.
For my walls (2x4"), I used R14, and my ceiling (2x8") is R28. It was pretty easy to work with (it's friction-fit), and I feel it's going to be a great insulator for my house.
After insulating all the walls, we sheeting the interior with 3/8" plywood. This task was far more work than sheeting the outside, as we had to measure, cut, and fit the plywood around every outlet, switch, pot light, and window. To be honest, my Dad did most of this, and he did an AMAZING job. It's looking more and more like a home!
After we were done the sheeting, we installed the bathroom fan (vented out the passenger side wall) and the exterior door. We also had to build a box around the fenders (and insulate inside), and attach the stairs to the wall. My dog, Dasi is already loving them!
With the door, it wasn't until I already bought it that I realized that I overlooked a key detail... Remember me not ensuring the windows were the correct width, and they arrived with the standard 2x6" frame when my walls are only 2x4"? Well doors are also built standard for 2x6" walls, so, YET AGAIN, my Dad had to MacGyver a fix...! He took the casing off, cut 2" all around (which was tougher on the bottom because it's a metal sill), replaced the casing, and there we had it: a 2x4" framed door! Thanks Dad for continuing to fix my oversights...! :D
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