Capillary Rise. Wicking upward from footing / foundation Beware connecting wet soil to moisture sensitive materials via foundations
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1 Capillary Rise John Straube, Ph.D., P.Eng Floor Slabs Wicking upward from footing / foundation Beware connecting wet soil to moisture sensitive materials via foundations presented by Building Science 2008 Slabs and Flooring No.2 Building Science 2008 Slabs and Flooring No.3 Building Science 2008 Slabs and Flooring No.4 Straube buildingscience.com 1 of 8
2 Problems Solutions Works with carpet, does not with impermeable flooring Building Science 2008 Slabs and Flooring No.5 Building Science 2008 Slabs and Flooring No.6 An insulated slab w/poly & break Building Science 2008 Slabs and Flooring No.7 Building Science 2008 Slabs and Flooring No.8 Straube buildingscience.com 2 of 8
3 Sand over poly = stupid Wetting sand sub-slab Built in moisture Construction water Perimeter leaks Building Science 2008 Slabs and Flooring No.9 Building Science 2008 Slabs and Flooring No.10 Moisture Storage RH vs MC Wood flooring Cupping and cracking Due to internal moisture gradients Moisture gradients caused by wetting/drying Wood movement occurs in vapor regime Often moisture rises from below through untreated wood Poly under slab, dry concrete Building Science 2008 Slabs and Flooring No.11 Building Science 2008 Slabs and Flooring No.12 Straube buildingscience.com 3 of 8
4 Wood floor built-in moisture solutions Maintain stable RH (not vapor pressure) Reduce absorption on all 6 sides of wood Seal back with impermeable coatings Slow drying rate / reduce rate of moisture supply coat concrete with impermeable coating Special vapor tight adhesives (e.g. Bostik BST) Use engineered wood (less cross grain) Don t get wood movement Solid wood on radiant floors SikaBond-T55 Building Science 2008 Slabs and Flooring No.13 Building Science 2008 Slabs and Flooring No.14 Flooring on slabs Something that keeps coming up Flooring on slab on grades Concrete on metal decks Changes in flooring More VCT, vinyl, ceramic (less permeable) Water based adhesives Slower drying concrete Faster construction cycles Building Science 2008 Slabs and Flooring No.15 Building Science 2008 Slabs and Flooring No.16 Straube buildingscience.com 4 of 8
5 Adhesive failure Latex based floor adhesives Start as emulsions, dry to form latex film Won t break down when re-wetted High alkalinity + moisture causes failure Isolation sheet - Tiles Vapor barrier, flexible shear isolation Use unmodified mortar drying Building Science 2008 Slabs and Flooring No.17 Building Science 2008 Slabs and Flooring No.18 Adhesive Failure: Resilient Flooring Epoxy e.g.: Aquafin Vaportight Coat Koester Vap I 2000 Sinak VECT-R VCT and sheet vinyl are vapor barriers Adhered with latex based adhesives Must protect from alkali / moisture Sol n: alkali reistant sheets and coatings Epoxy coating can be the vapor barrier Small holes/joints allow water to evaporate Epoxy floor coatings Formation of silicate crystals at drying interface Require moisture and free alkali s Building Science 2008 Slabs and Flooring No.19 Building Science 2008 Slabs and Flooring No.20 Straube buildingscience.com 5 of 8
6 Ceramic Tile Crack Reflection Building Science 2008 Slabs and Flooring No.22 Ceramic tile / Stone cracking Shear Isolation membranes or coatings Weak Shear planes (and low perm) AFM Protecto wrap Polygard Tileguard Bostik MVP (not for VCT) Building Science 2008 Slabs and Flooring No.23 Building Science 2008 Slabs and Flooring No.24 Straube buildingscience.com 6 of 8
7 Basement Floors Concrete alone fine but when you finish! Comfort (cold and hard) Water under finish flooring Water condensing on top (summer) Solutions Install finish over small amount of insulation Install vapor barrier on top of concrete Either very tough / durable (heavy duty) Or must be adhered (epoxy) OSB over heavy poly dimple sheet vapor barrier and some insulation Air seal joints/edge Beware Joints Building Science 2008 Slabs and Flooring No.25 Building Science 2008 Slabs and Flooring No.26 Building Science 2008 Slabs and Flooring No.27 Building Science 2008 Slabs and Flooring No.28 Straube buildingscience.com 7 of 8
8 Slabs Solutions Dry slabs, not just cure them! Vapor barrier under slab Stop soil moisture by diffusion Capillary break Stop capillary wicking Sheet goods, crushed stone, air gap Insulation Keep slab warmer Insulation also can be vapor retarder cap break Building Science 2008 Slabs and Flooring No.29 Building Science 2008 Slabs and Flooring No.30 Flooring & Moisture Moisture Sources Soil liquid and vapor Built in moisture (concrete flooring adhesives) Interior air vapor Interior floods & plumbing leaks Transport Mechanisms Capillary (from soil up) Diffusion (from soil) Air movement (from interior humidity) Building Science 2008 Slabs and Flooring No.31 Straube buildingscience.com 8 of 8
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