A crunchy pink mass protruding from a wall can look alarming, but in many cases it is simply expanding spray foam insulation used during construction or repairs to seal gaps around pipes, windows, wiring, or door frames.
Spray foam comes in many colors depending on the product and manufacturer, including pink, yellow, blue, or orange. Color alone is not reliable for identification. Its texture, location, and how it is bonded to surrounding material are more useful clues.
When applied, the foam expands as it cures, sometimes pushing through cracks or exceeding the space available. This can leave uneven, bubbly formations that harden on the surface, especially if excess material was not trimmed after installation.
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