Roof structure has structural steel framing members. The sheathing covering the steel joists is usually fireproofed gypsum covered by a fibrous, water-resistive material. Edges are scored to provide a tight fit at the joints.
Roof cover.
Consider the size, spacing and composition of the supports when selecting a quality, as well as the thickness of the deck. Generally, prefabricated members, such as web joists, are low quality, while site-built members are high quality.
Enter the following for this component:
Percent of Total Floor Area: 1 – 100, or
Roof Area (Square Feet)
Roof Structure