About 3 months ago we had some basement repairs done that included correcting a dip in the center of the house with 3 support columns that raised the house back to level (jacked up by 1.5 inches).
Last week we heard a loud crack from the garage and discovered that 3 sistered ceiling joists that are between the house and garage have gone from being tightly screwed together to being separated by about an inch. The one nearest the house is pulling towards the house and the other two remain mostly straight. Also the joist hanger that connects the house joists to these sistered beams has fully pulled out on one side. I'm trying to determine if this is just a minor part of the house readjusting or a an issue that needs addressing quickly. A structural engineer who we originally consulted declined to visit the house as he said it didn't sound like a major issue, but I remain concerned and would welcome suggestions from others who have had their houses raised.
House on left, so joist hanger that popped is connected to the joist skewed towards the house.
House on left, garage right.
Reverse angle (house on right), the other end of the joists are not moving apart as much
House on left closer to the wall where there's minor cracking at the wall.
Best Answer
Your roof seems going through some movement, the reason, or the reasons, can't be pinpointed through a few pictures. You shall go back to the original consultant engineer, who I assume was overseeing and responsible for the jacking operation occurred a short while ago. The structure may not under immediate threat of collapsing, but it is prudent to find out why (including potential hidden problems), and make proper decision from there, on whether immediate repair is required, or not.
I would insist the engineer to have a visit, or issue a statement that there is no "big problem". I think he would respond differently then :) Send him the invitation in writing too.
If the engineer still refuses to visit, have a second opinion from another qualified engineer. I'll report the conduct to his licensing board, or local building official, if any problems is being identified.