I finished work on the shell of the Spartan. Wiring and plumbing is done, air conditioner rough in is ready. Time for insulation. I had the whole thing sprayed with Icynene open cell foam. It consists of two hot liquids that combine in the nozzle, converting to foam before your eyes. Notice how the installer holds the wires with his finger so they don't get pushed out by the foam. They have to slice off all the foam that sticks out past the edge of the walls and ceiling. There was another man in there cutting the cured foam at the same time the man in the respirator was spraying it. I dislike the smell myself. It makes me cough. There is a lot of water vapor released in the chemical reaction. The man in there without a respirator said he couldn't smell it. The smell goes away quickly as soon as all the water evaporates. The cured foam has no smell if you sniff it. When I had my house done I could still faintly smell it a few weeks after it was sprayed when I came in if the house had been closed up all day, but in a month it was totally odorless.
I've read several case studies of foam that comes out smelling like dead fish. This is usually closed cell foam which is different chemicals. The problem is the installer sprays too much at a time and it skins over before the inside can fully expand, they don't have the chemicals hot enough, or they have the wrong mix ratio. But all the complaints are in attic spaces where they were filling rafter bays made of 2x12s. My walls are tapered with a maximum of 3 1/2" thick in the middle so they would be challenged to do it too thick.
This same man sprayed my house in 2006. If he was doing it wrong he wouldn't be doing it anymore, so I feel confident he's doing the best job possible. He seems very deliberate and has some kind of plan. Not sure why he skips around like that. To keep it from overheating in one spot? It seems smart to me considering he's spraying a 140°F liquid on aluminum. It's going to heat up the surrounding area.
I chose this song because the clean up involved me using the shop vac for about 45 minutes. This song was stuck in my head. It's also used in irony because the installer told me he would love to live like me, with a tiny house and a big shop. But he has a wife and kids... Every man that ever comes out here to work on something says that. I don't know if it's just to be nice or what. If makes me feel smug either way.