How Spray Foam Responds to Moisture Exposure from Roof Damage
How spray foam insulation responds to moisture exposure from roof damage depends entirely on the type of foam that is installed. Closed-cell spray foam, with its dense and waterproof structure, acts as a resilient barrier. It will not absorb the water and is not damaged by the exposure; in fact, it often helps to contain the leak and make it more obvious. Open-cell spray foam, on the other hand, is soft and absorbent like a sponge. A significant roof leak can saturate it, causing it to lose its insulating value and hold a large amount of water against the roof structure, which can lead to serious long-term problems like rot and mold if not addressed quickly. Understanding this fundamental difference is critical for any homeowner who has or is considering professional spray foam insulation for their attic. This guide will explain the science behind how each type of foam interacts with water, how to identify a leak in a spray-foamed attic, and what the proper steps are for remediation. ...