Forbo Foam Underlay | For Marmoleum click loose lay installationsRecommended for use under Marmoleum Click loose lay installations. Forbo Foam underlay offers an improved impact sound reduction as well as an increased ease of comfort under foot. Please note Forbo Foam is not suitable for use in areas with any type of underfloor heating. In this instance we would recommend the use of an alternative laminate style underlay. Note: The failure to use Forbo Foam underlay or the use of alternative underlays that have not