Cavity foam, specifically spray foam cavity wall insulation, is a type of insulation that is designed to be applied within the empty spaces, or cavities, of walls. This method provides insulation by filling these spaces with an expanding foam that solidifies, creating a thermal barrier.
How Does Cavity Foam Work?
Here's a breakdown of how cavity foam functions:
- Application: The foam is sprayed directly into the wall cavities, usually through small holes drilled into the exterior wall.
- Expansion: Once sprayed, the foam expands rapidly, filling the entire cavity space.
- Airtight Seal: As the foam hardens, it creates a continuous, airtight seal. This seal is crucial for preventing air leaks and minimizing heat transfer.
- Insulation: The foam's material itself provides excellent thermal insulation, reducing heat loss in the winter and heat gain in the summer.
Benefits of Cavity Foam Insulation
Using cavity foam offers several advantages:
- Improved Energy Efficiency: By reducing heat loss, cavity foam can significantly lower heating and cooling costs.
- Reduced Drafts: The airtight seal minimizes drafts and creates a more comfortable living environment.
- Moisture Management: When properly installed, cavity foam can help prevent moisture buildup within walls.
- Sound Reduction: The dense foam material can also help reduce noise transmission.
Types of Cavity Foam
While different brands exist, most cavity foams fall into two main categories:
| Type | Description |
|---|---|
| Open-cell Foam | Softer and more flexible, allowing some moisture passage. |
| Closed-cell Foam | Rigid, denser, and completely waterproof, providing better insulation and structural support. |
Key Takeaway
Cavity foam is an efficient and effective insulation solution that involves spraying foam into wall cavities to create an airtight seal, reduce energy costs, and enhance comfort. According to the reference, it is a type of insulation that is sprayed into the cavities of walls to insulate them. The foam expands and fills the cavity, creating an airtight seal that prevents heat loss.
