nealtw
Contractor retired
If this is caused by moisture, we should be talking about attic venting.
If this is caused by moisture, we should be talking about attic venting.
More than likely in the winter it is too dry up there.
I know "zero" about trusses, so let me ask the dumb question: why doesn't this happen to stick-built houses? After all, once it's all nailed together it is essentially the same thing???
Hard plastic
Truss uplift varies on the climate. A big difference geographically.
In the cold, dry north the uplift effects come from the bottom cord that is buried and covered with insulation. That minimized the temperature effects, so the diagonals a much colder in the winter if there is good ventilation above the ceiling insulation. - This leads to the diagonals and top chords becoming shorter and pulling up the total truss upward, causing the cracks in dry wall joints.
It is worse on the interior walls because the temperature effects are a little less than the exterior walls there the trussed a held in place better.
It is a little different where the temperatures and are more constant.
Any truss will move with loads, temperature and moisture.
Dick
I can see it in my hallway, it runs perpendicular to the trusses. The drywall lifts where the wall and ceiling meet. Comes back down in the summer. You can just see the tape pulling, doesn't leave a crack, most people probably never see it. In hind sight, there are a few things that I would do different.
Enter your email address to join: