Which aspect is not typically considered in the percentage of lumber waste in framing?

When considering the percentage of lumber waste in framing, the aspect that is not typically accounted for is environmental factors. The calculation of lumber waste usually focuses on quantifiable and controllable aspects of the construction process.

Cutting errors are a significant source of waste, as mistakes made during measurement or cutting can lead to unusable pieces of lumber. Material defects refer to flaws in the lumber itself, such as knots or splits, which can render some sections of wood unusable. Design changes also contribute to waste, as revisions in the plans may require additional cuts or new materials that can lead to excess leftovers.

Environmental factors, while they can influence overall construction practices and sustainability considerations, do not typically factor into the specific calculations of lumber waste percentage. This is because environmental factors are external and not directly tied to the actions taken during the framing process.