What structural issues can roof truss uplift cause?
A. above exterior doors and windows
B. at interior wall/ceiling intersections
C. in bottom chords of roof trusses
D. in top chords of roof trusses
Answer:
Roof truss uplift can cause cracks at interior wall/ceiling intersections (B) due to pressure on the ceiling, and in the top chords of roof trusses (D) due to stress on the truss itself. Therefore the correct option is B. at interior wall/ceiling intersections, D. in top chords of roof trusses.
Roof truss uplift is a common issue that occurs when temperature and humidity fluctuations cause the roof truss to expand and contract. This can lead to structural problems in a building, resulting in cracks and damage.
Cracks at Interior Wall/Ceiling Intersections:
When roof truss uplift occurs, the interior walls and ceilings are often impacted. As the truss moves, it can push against the ceiling drywall or plaster, creating cracks at the intersection. These cracks are typically observed along the length of interior walls, where the trusses are connected to the top plates.
Cracks in the Top Chords of Roof Trusses:
The top chords of roof trusses can also experience cracking due to uplift. This is because the truss itself may be lifting at its peak, causing stress on the top chords. Over time, this stress can lead to cracks in the wood or other materials used in the truss construction.
In summary, roof truss uplift can cause cracks at interior wall/ceiling intersections and in the top chords of roof trusses. Addressing this issue may involve adjustments in construction techniques, materials, or the installation of specialized hardware to mitigate the impact of temperature and humidity fluctuations.