I have a pretty standard to North America wooden carcass home - two floors above ground, and a sub-basement below, plus an attached garage, sitting on top of it's own foundation.
Over the summer I had a room built over the garage, which went reasonably well, everything approved by the city and the contractor's architect.
During the recent snowfalls, I guess a large amount of weight was added to the new extension and I saw that the floor in the 2nd floor room adjacent to the new space kind-of bent upwards near the wall next to the newly added space, with the hardwood tiles spreading out.
I don't see any other damage (at least so far), but I wonder what I should do about it - if I simply fix the floor, will I be ignoring a larger issue? Will it actually cause even more damage in the summer when the weight of the snow is gone and the beams that are bending straighten out again?
Should I simply call the contractor and drop the problem in his lap, or get an inspector to take a look at the damage first?
Any other recourse?
Note - I'm in Canada, so the snow and extra weight isn't something rare like you'd expect down in Texas for example. I do believe the contractor should have examined the existing structure while he had the walls open and determined the existing beams are strong enough to connect the added structure to.
Here's a closeup photo showing two floor pieces, one that remained in place and another that moved: