Understanding slope nomenclature in architecture can be tricky because there are several different ways that slopes are expressed in an architect firm and on the construction site. If you are ever discussing roof slopes, pipe slopes or pavement slopes with a colleague you want to be knowledgeable.

Slopes are expressed in rise over run, in percentages and in fractions.

Let’s quickly review important slope concepts in architecture and see if we can gain a better understanding so that there is no confusion on your ARE exams or on your next project.

This lesson will cover the following…

• Slope basics (Percentages, Ratios, Fractions)
• 1:12, 1:16 and 1:20 slopes
• Why are slopes sometimes confusing?
• Comparing & Converting slopes
• 1/4″ and 1/8″ slopes and why they are important
• Common slopes in practice