Obviously it is a pretty critical thing to understand how to read dimensions on a plan. Here are a few tips to understand how we do our dimensioning.
It's important to understand how measurements are shown so you can accurately read the number.
They are written as:
feet ' / hyphen / inch / fraction "
We typically use imperial measurements (feet/inches) as the majority of the residential building industry uses imperial measurements.
Dimension (witness) Lines
The lines that extend from the dimension to the object being measured are called witness lines. We like to use a witness line with a gap because it helps de-clutter the plan a little - it can lead to confusion when you have a full plan with many dimensions.
Especially if plans are only printed in black and white - ours are printed in colour for greater clarity!
The markers that are used to indicate the edges of the measurement can use various symbols such as dots, or arrows.
We prefer using slashes because arrows and dots can make a busy plan look too cluttered pretty quickly. Slashes seem to be a little more subtle and clean.