
There are many types of insulation materials, such as blown-in, spray foam. Then there are cellulose, fiberglass, blown rock, hemp, wool and many other types of materials. I have done a lot of research on different types of insulation materials, with the aim of finding environmentally friendly options. There are some clever methods, such as straw bales or hemp concrete, that can absorb carbon dioxide from the air and create a very comfortable home! However, due to wall thickness and my limitations in renovating my historic home walls, these two types of insulation materials are usually not suitable for renovations.
Rock wool board installs like traditional fiberglass - actually I think it's easier to install! It is mold-proof, fireproof, and does not cause itching like fiberglass materials. It is made from melted rock, blown like cotton candy. This concept is wild and cool.
Rock wool boards are easy to install. It's like a life-sized version of Tetris, just a bit messy. The insulation material is non-toxic and not as itchy as fiberglass insulation, but it does generate dust, so I recommend wearing a dust mask, gloves and long sleeves, which can well avoid mild itching. The only thing needed to put these things on the wall is a utility knife, because it has an ergonomic handle.
In order not to waste anything, I filled the large cavities with full-size pieces, then filled the positions where I could fit most pieces with just one cut. Then, I collected all the cut-off scraps and used them to fill those very unstable walls. You can see in the photo of that bay above that all these components have a lot of pipes, and I need to wedge rock wool board insulation between, behind and around them.
The internal wall between the kitchen and bathroom is full of pipes and electrical equipment, so it is not easy to put these components there without back support. Most people recommend installing drywall on one wall first, so you can press the ball material into it. However, I don't know the work schedule of the drywall workers, and I don't want to slow them down by trying to finish the insulation while they are trying to cover everything. When they put the drywall on one side, I may need to leave a few pieces wedged in.

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