Sustainable construction specialists. Limecrete flooring is a floor system involving recycled foamed glass isulation and a screed or limecrete slab. Underfloor heating works well with limecrete and can be laid directly in the slab or installed in the screed. This system is also breathable. Breathable. Environmental. Construction. Low Carbon. Underfloor heating. Limecrete Product Overview The limecrete floor consists of a compacted layer of Recycled Foamed Glass insulation on top of prepared subbase and geotextile membrane. This is followed by another layer of geotextile and limecrete produced using lightweight insulating aggregate rather than conventional sand. Depending on individual requirements this can be followed by screed before the final floor finish. Low carbon. Breathable. Environmental. Construction.