Capillary Water Barrier Material

Sand gravel or a porous geosynthetic e g.

Capillary water barrier material. 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. Foundation water barrier hdpe. Construction materials like concrete aggregates and sand are porous and allows water molecules to rise due to capillary action. Our heavy duty waterproof hdpe material is an ideal solution for limiting subterranean water movement.

1 2 2 degree of compaction. The principle behind the capillary rise is the surface tension cohesive force of water due to polarization of water molecules. 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. 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.

This creates a ring of dampness in base of buildings or structure including lateral walls due to accumulation of capillary water. This can be problematic as the capillary barrier may cause undesirable moisture build up in the overlying soil. Install a vapor barrier over this consisting of. 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.

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. 302 2r 32 8 1 introduction 8 2 communication between architect and engineer 8 3 floor covering technical resources 8 4 floor adhesives and. The vapor barrier serves a similar purpose but generally is discontinous and breached during the construction process so using both is truly a better way to go if your goal is to mitigate the upward migration of moisture. 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.

Chapter 7 vapor retarder barrier p. 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. 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.