When it comes to selecting the right type of spray foam insulation for your project, it is essential to understand the differences between open-cell and closed-cell foam. Closed-cell spray foam is denser and more moisture resistant, making it better suited for outdoor applications and areas with high humidity levels. Open-cell spray foam is lighter and less dense, making it more suitable for indoor applications with a higher risk of moisture. The R-value of a foam is its resistance to heat flow, or in other words, how well they insulate.
Closed-cell foam has a higher R-value than open-cell foam, typically around 6.0 per inch. However, some closed-cell foams, such as Tiger Foam's E84 closed-cell formula, have even higher ratings, reaching nearly 7 per inch. This higher rating means that closed-cell foam better maintains heat inside or outside a structure. Open-cell foams have an R-value of around 3.5 per inch.
When it comes to soundproofing, open-cell foam is the way to go as a single application can completely fill the area between the uprights. Closed-cell spray foam insulation is the most common type of spray polyurethane foam used and provides a better thermal barrier than open-cell spray foam. The main differences between the two types of spray foam insulation are detailed in the following table:
- Closed-Cell Spray Foam: Denser and more moisture resistant; Higher R-value (typically around 6.0 per inch); Acts as a vapor barrier; Not affected by water damage.
- Open-Cell Spray Foam: Lighter and less dense; Lower R-value (around 3.5 per inch); Excellent for soundproofing; Expands up to 3 inches thick.
On the other hand, if you need to create a constant temperature in the building and reduce energy consumption, closed-cell spray foam may be the better option. Open-cell foam is also great for hard-to-reach corners of a home as it expands a lot after it's applied. The R-value of spray foam insulation can vary by product, manufacturer, and some other variables. Generally speaking, open-cell spray foam measures 6 to 10 inches on the terrace or roof (depending on where you live) and 3 inches on the walls. When choosing between open-cell and closed-cell spray foam insulation, consider your project needs and environment carefully to make sure you get the best results.
It is important to take into account factors such as climate conditions, desired insulation level, soundproofing needs, and budget when selecting the right type of insulation for your project.
