No! It's a misconception that all spray foam must be the same. There are a close cell and open cell spray insulation. At first, they may seem extremely similar but the differences are quite vast. Let's talk about some of them.
Open-cell spray foam is considerably less dense and spongier compared to the closed-cell. Due to its open cell, it will absorb moisture because of which it cannot give significant strength to the structure and cannot act as an air barrier material. They are prone to moisture absorption and is vapour permeable. Mostly it may require an additional vapour retarder and is not recommended for use below grade or flood-prone sites.
On the other hand, closed-cell spray foam can be used in all climatic conditions and is the preferred choice for many air sealing and insulating tasks. This includes severe weather and air barrier systems. The closed-cell spray can add to structural virtue for enhanced performance during harsh weather times. It's widely used as a moisture control layer. Closed-cell spray foam is resistant to water and is considered a type two vapour retarder. It can meet for different barrier conditions namely thermal, moisture, vapour, and air.
This allows significant design flexibility and is quite cost-efficient compared to the additional details and products required for an open-cell spray.
The FEMA (federal emergency management agency) considers CC SPF to be flood damage-resistant – construction and insulating material and has approved it.
So, know what glass wool heat insulation suits your purpose the best before purchasing it.