The foam is known as expanding or expanded foam – how much does the sprayed foam expand by?
The foam is called expanding foam because it contains a blowing agent which introduces bubbles or cells into the foam as it cures. This makes the foam less dense and greatly improves it’s insulation properties. Expansion takes place in 2 places, both in the nozzle and after it leaves the nozzle. It expands by a ratio of approximately 8:1 after it leaves the nozzle.
