Capillary Water Barrier Material

Foundation water barrier hdpe.

Capillary water barrier material. This can be problematic as the capillary barrier may cause undesirable moisture build up in the overlying soil. 1 2 1 capillary water barrier a layer of clean poorly graded crushed rock stone or natural sand or gravel having a high porosity which is placed beneath a building slab with or without a vapor barrier to cut off the capillary flow of pore water to the area immediately below a slab. Install a capillary break beneath slab foundations for example a slab on grade or basement slab foundation consisting of 4 inches of aggregate stone or 4 inches of sand covered by geotextile matting. The hdpe sheet material is typically installed outside adjacent to the building s foundation and acts as a reliable water barrier for basements and crawl spaces.

Install a vapor barrier over this consisting of. Chapter 7 vapor retarder barrier p. A capillary barrier develops when an unsaturated fine grained soil layer is underlain by another unsaturated porous material with relatively large sized pores such as a coarse grained soil layer e g. Capillary action occurs because water is sticky thanks to the forces of cohesion water molecules like to stay close together and adhesion water molecules are attracted and stick to other substances.

A capillary barrier will form and restrict water flow when two porous materials with differing porous structures e g a geotextile overlain by a fine grained soil are in contact with one another. Capillary water barrier shall consist of clean poorly graded crushed rock crushed gravel or uncrushed gravel placed beneath a building slab with or without a vapor barrier to cut off the capillary flow of pore water to the. 302 2r 28 7 1 introduction 7 2 vapor retarder barrier location 7 3 vapor transmission through retarder barrier chapter 8 floor covering materials p. Construction materials like concrete aggregates and sand are porous and allows water molecules to rise due to capillary action.

A capillary break should be as jae noted gap graded to keep out most of the fine material and should have a fineness modulus of at least 3 0. The principle behind the capillary rise is the surface tension cohesive force of water due to polarization of water molecules. 1 2 2 degree of compaction. Our heavy duty waterproof hdpe material is an ideal solution for limiting subterranean water movement.

302 2r 32 8 1 introduction 8 2 communication between architect and engineer 8 3 floor covering technical resources 8 4 floor adhesives and. Sand gravel or a porous geosynthetic e g. It is defined as the movement of water within the spaces of a porous material due to the forces of adhesion cohesion and surface tension.