porous fill

drainage fill

1.Lightweight concrete which is placed on roofs or floors to promote drainage.
2. A base course of granular material placed between a sub-grade and floor slab to retard the capillary rise of moisture.
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References in periodicals archive ?
5M64 Surface Course ; 500 TON Hot Mix Asphalt 25M64 Base Course ; 400 CY Porous Fill ; 950 LF 9 x18 Concrete Vertical Curb.