GE Foam Large Gaps VOC, GE-branded Big Gaps and Cracks Insulating Foam expands to fill and seal large gaps and cracks that are wider than 1-in. Block out pests, moisture and drafts with a powerful airtight and water-resistant seal that helps lower energy costs and prevent mold and mildew growth. Use this foam sealant indoors or outdoors to weatherproof, spot insulate or seal large gaps and cracks up to 3 in. in areas like basements, crawl spaces, foundations, under baseboards, around plumbing, around HVAC ductwork and more. GE-branded Gaps and Cracks Insulating Foam has the advanced flexibility and premium durability needed to create long-lasting, weatherproof seals you can trust.