We just had a new roof installed in which one of the roofer's nails punctured the refrigerant tubing in our attic from our 2 year old central air conditioner unit. The roofer said it was the a/c installer's fault for having left the tubing arc up against the plywood instead of securing it so that no part of the tubing would be butting up against the plywood (visible inside the attic). The a/c installer said it was the roofer's fault for not coming into the house to check the location of all the refrigerant tubing in the attic. Who should pay for the repairs? Roofer, a/c installer or us. We have a photo which shows the tubing butting up against the plywood.