6.1.2. Roofs

Try these first

1. 1.

   What does L_o represent in the roof live load reduction equation?

   Hint

   Think of what load would be there without any reductions.

2. 2.

   What is the general range of reduction factors for R?

   Hint

   Consider the cases given in the section.

3. 3.

   What is the purpose of using R factors in roof live load calculations?

   • To increase the associated loads
   • To reduce the effective load based on conditions
   • To eliminate the loads altogether

   Hint

   Remember the conditions under which reductions are approved.

4. 4.

   True or False: All roofs are eligible for reduced live loads.

   • True
   • False

   Hint

   Think about commercial versus residential roofs.

5. 5.

   Evaluate a roof with an original live load of 70 psf and calculate the reduced live load for a tributary area of 800 ft² considering both reduction factors.

   Hint

   Focus on how you compute R_1 based on area.

6. 6.

   Imagine an architectural scenario where you have to choose a roof type based on loaded requirements. Consider a theater versus a warehouse.

   Hint

   Think about events that occur and the space available.