What type of roof system is utilized with lumber and safety jacks?

The conventional roof system is characterized by its use of lumber and safety jacks, which are essential for securing the framework during construction and providing stability. This system relies on wooden beams and rafters to support the roof, allowing for a straightforward construction process that is both cost-effective and flexible.

In a conventional system, the roof is framed with standard lumber sizes, which are readily available and can be easily worked with by most builders. Safety jacks play a crucial role in ensuring the safety and integrity of the structure during the assembly phase, as they help support the weight of the roof until it is fully secured.

The versatility of the conventional roof system makes it suitable for various building applications, ranging from residential homes to larger commercial structures. This adaptability, combined with the use of lumber and safety jacks, underscores why the conventional system is the correct answer in this context.