They arrived just in time to be usable. I had a tight space between the floor joists and the sub floor where I had to solder. I attached these two carbon fiber spacers to the floor and draped them over the plastic downspouts. I use a burner from Bernz-o-matic. This burner heats up very quickly. When soldering, I saw the edges of the pads glow, but they never caught fire. I soldered and, as I said, didn't burn down the house.