Double wall window seals

I’m replacing windows in a 30 year old double wall house. The jambs were sealed at the interior wall with a gray sealant similar to Moretite gasket cord but softer/sticky… I’m replacing windows in a 30 year old double wall house. The jambs were sealed at the interior wall with a gray sealant similar to Moretite gasket cord but softer/sticky…Read MoreGreenBuildingAdvisor