Which statement is true regarding roof trusses?

Roof trusses are indeed typically designed for two-point bearing, which means they are engineered to support loads at two specific points, allowing for a more efficient transfer of weight. This design helps to distribute the roof load across the walls of a building, providing structural integrity while allowing for open floor plans beneath the roof.

When roof trusses are designed with this two-point bearing system, they can effectively span large distances between load-bearing walls without the need for additional support structures in the middle. This is advantageous in residential and commercial construction, where space and openness are often prioritized.

The other statements are misleading. Modifying roof trusses in the field can compromise their structural integrity and is generally not recommended unless done by a qualified professional. While trusses can help in reducing drywall nail pops compared to solid lumber, it is not a simple guarantee, as various factors can still contribute to this issue. Lastly, trusses can indeed be designed for long spans, contrary to what one of the other statements might imply. Their engineered, triangulated design allows them to handle significant loads over extended distances without additional support.