The soffit material under the main deck. The same material was used to cover the stairway from the main landing to the deck.
Below is a photo record of all the main floor and upstairs hydronic tubing installed in the house. The basement photo record is in a much earlier post. All rooms in the house were photographed.
Funny. The sign says is pressure is below 50 psi, call the company immediately. I don't remember this being broken or cracked. And it reads ) psi. Obviously the system is still open, but I find it amusing.