There was no signs of water. I usually see the entry stuffed with a gray putty. I did not think of that. Is there a definition of, "easily ignitable material?" Good question, they should have specified a flammability rating. However, I just did a little research and found out some of the foams have flame retardant. I got this off the American Chemistry Council's website; Does the cured sealant pose a fire hazard? Is it flammable? Insulating foam sealants typically contain flame retardants and when installed properly, are designed to meet all applicable building and fire code regulations Installed cured product is combustible and will typically begin to thermally degrade at temperatures above 240?F/116?C. In addition, the unreacted chemical constituents in the can may be combustible, so you should carefully read the instructions on the product label and follow them with respect to avoiding installations in areas exposed to high heat, such as around fireplaces, heaters, radiators, heat lamps, recessed lighting, bare copper wires, or inside electrical boxes. So I guess we need to find the used can and read the label;)