Our ducted heatpump and lossnay ventilation was installed in our attic across two sets of diagonal webs above two chords (1 year ago). Combined these two hvac units are about 50kgs.
This is a new build, and from some research, seems like they design the attic load tolerances to be really tight, thus any extra permanent load in the attic is a bad idea?
I think I just figured out the chords are not supported by any internal load bearing walls and just exterior walls (two-storey townhouse). I think the chord span is about 7m. It seems like the chords don't touch anything below them, besides some that sit on some metal rails (not sure what those are).
I also installed attic ladder and some attic flooring (for storage) in the center of the attic, which now worries me further. I'm thinking of moving the flooring to the edge of the attic near the structural exterior/tenancy walls. The attic flooring was installed with perpendicular battens to give the insulation space, topped with 18mm ply. Maybe that gives the chords some strength? But it isn't on the chords with the heatpump.
Should I be worried? I'm worried I'm an idiot and allowed the slow permanent damage of my attic :( Perhaps I could measure the difference in sag between different chords to confirm?
Images: https://imgur.com/a/p04R3V4
Edit: Come to think of it, is the way this heatpump installed, hole right in the middle of a diagonal web truss, against the building code?