How are roof deformations caused by snow classified by their cause?

Question

When classified by cause, what type of deformation occurs in a roof element bending under a snow load?

Answer choices

1. Elastic.
2. Load-induced.
3. Volumetric.

Explanation

A snow load is an external mechanical force acting on the roof element. Deformations caused by it are therefore load-induced.

“Elastic” describes whether deformation is reversible after a load is removed. That is a different classification criterion. This question asks about the cause, rather than the element's ability to recover its shape.