Q. What is the best material to use to patch Icynene spray foam insulation? Sometimes it’s necessary to remove a substantial amount of the stuff after it has been installed.

David Ballantyne, project engineer at Icynene, Inc., responds: The best way to patch a hole in Icynene insulation will depend on the size of the repair. For small and medium-sized patches, a can of spray urethane foam (one-component foam from the lumberyard or hardware store) works very well. There is no compatibility problem with using other...

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