For loads specified as Reducible, the live load on any member supporting 20 square meters or more of Reducible live load is reduced per the equation in NBC Clause 4.1.6.9.3.

NBC Clause 4.1.6.9.2 is applicable for members supporting assembly loads of 4.8 kPa or more, or storage, manufacturing, retail, etc. For Live Load Reduction purposes, the program classifies these types of loads as Storage Live Load. For loads specified as Storage, the live load on any member supporting 80 square meters or more of Storage live load is reduced per the equation in NBC Clause 4.1.6.9.2.

The user must explicitly specify loads as Reducible or as Storage in order for the corresponding reductions to be performed. Any live load designated by the user as Storage will be treated as such whether the load is greater than 4.8 kPa or not, and any load specified as Reducible will be treated as such (using the reduction in Clause 4.1.6.9.3) even if the load is greater than 4.8 kPa.

No reduction is made on loads specified as Unreducible or Roof.

It is important to note that the output lists the reduction as a percent by which the load can be reduced, rather than as a load multiplier.