ASTM_D_7492_-_D_7492M_-_11.pdf

Designation:D7492/D7492M11Standard Guide forUse of Drainage System Media with Waterproofing Systems1This standard is issued under the fixed designation D7492/D7492M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This guide makes recommendations for the selectionand application of prefabricated drainage media used in con-junction with waterproofing systems on horizontal and verticalsurfaces.Drainage media considered include rigid and semi-rigid insulation boards and rigid materials including plastics.The scope of this guide does not cover other drainage mediaincluding gravel and filter fabric systems that can be con-structed.The scope of this guide does not cover drainagematerials or drainage system designs used for vegetative roofsystems.Vegetative roof systems require specialized designs.1.2 The committee with jurisdiction over this standard is notaware of any other comparable standards published by otherorganizations.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.4 This standard may involve hazardous materials,opera-tions and equipment.This standard does not purport to addressall of the safety concerns,if any,associated with its use.It isthe responsibility of the user of this standard to establishappropriate safety and health practices and determine theapplicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C165 Test Method for Measuring Compressive Properties ofThermal InsulationsC898 Guide for Use of High Solids Content,Cold Liquid-Applied Elastomeric Waterproofing Membrane with Sepa-rate Wearing CourseC981 Guide for Design of Built-Up Bituminous MembraneWaterproofing Systems for Building DecksC1471 Guide for the Use of High Solids Content ColdLiquid-Applied Elastomeric Waterproofing Membrane onVertical SurfacesD896 Practice for Resistance of Adhesive Bonds to Chemi-cal ReagentsD1079 Terminology Relating to Roofing and WaterproofingD2434 Test Method for Permeability of Granular Soils(Constant Head)(Withdrawn 2015)3D3273 Test Method for Resistance to Growth of Mold on theSurface of Interior Coatings in an Environmental Cham-berD3385 Test Method for Infiltration Rate of Soils in FieldUsing Double-Ring InfiltrometerD4511 Test Method for Hydraulic Conductivity of Essen-tially Saturated PeatD4630 Test Method for Determining Transmissivity andStorage Coefficient of Low-Permeability Rocks by In SituMeasurements Using the Constant Head Injection TestD4716 Test Method for Determining the(In-plane)FlowRate per Unit Width and Hydraulic Transmissivity of aGeosynthetic Using a Constant HeadD5898 Guide for Details for Adhered Sheet WaterproofingD6622 Guide for Application of Fully Adhered Hot-AppliedReinforced Waterproofing SystemsE154 Test Methods for Water Vapor Retarders Used inContact with Earth Under Concrete Slabs,on Walls,or asGround Cover3.Terminology3.1 Refer to Terminology D1079 for definitions of termsused in this guide.4.Summary of Practice4.1 This guide describes a method to estimate the amount ofwater a drainage system may need to carry.The guide alsooffers descriptions of the various drainage systems in existencetoday along with suggestions on how different building situa-tions will require different performance characteristics from thedrainage medium chosen.Items to be aware of during the1This guide is under the jurisdiction of ASTM Committee D08 on Roofing andWaterproofing and is the direct responsibility of Subcommittee D08.22 on Water-proofing and Dampproofing Systems.Current edition approved Nov.15,2011.Published March 2012.DOI:10.1520/D7492_D7492M-11.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 installation of drainage systems is also covered along withillustrations of typical drainage systems.5.Significance and Use5.1 This guide provides information and guidelines for theselection and installation of drainage systems media that are inconjunction with waterproofing systems.This guide is intendedto be used in conjunction with Guides C898,C981,C1471,D5898,and D6622 and to provide guidelines for the totalwaterproofing and drainage system.6.General6.1 Inselectingadrainagemedi