ASTM_C_406_-_C_406M_-_15.pdf

Designation:C406/C406M15Standard Specification forRoofing Slate1This standard is issued under the fixed designation C406/C406M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers the material characteristics,physical requirements,and sampling appropriate to the selec-tion of slate for use as roof shingles.1.2 Slates not included in this specification are those con-taining soft carbonaceous ribbons.The wide variation inphysical properties and composition of such ribbon slatesrender their service life uncertain under some conditions ofuse.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.2.Referenced Documents2.1 ASTM Standards:2C119 Terminology Relating to Dimension StoneC120/C120M Test Methods of Flexure Testing of Slate(Breaking Load,Modulus of Rupture,Modulus of Elas-ticity)C121/C121M Test Method for Water Absorption of SlateC217/C217M Test Method for Weather Resistance of Slate3.Terminology3.1 DefinitionsDefinitions shall be in accordance withTerminology C119.3.2 Definitions of Terms Specific to This Standard:3.2.1 service lifea period of time over which the slatematerial is expected to require no repair or replacement due toweathering.3.2.2 ribbonsnarrow bands of carbonaceous material,darker in color than the surrounding slate.These ribbons areinclusions of the original beds and are softer and less durablethan the surrounding material.4.Classification4.1 Roofing slate shall be classified by grade in accordancewith the physical requirements of Table 1,with the classifica-tion limited to the test specimen thickness,or greater thickness,as determined under Test Methods C120/C120M.4.2 When comparing slates of the same grade and equalthickness,but from various sources,slates which meet therequired breaking load at the lowest specimen thickness willyield the best performance on the roof in terms of resistance toimpact damage.4.3 Expected service life of the various grades,dependingon geographic location and environmental exposure,is asfollows:GradeService Life(years)Grade S1over 75Grade S240 to 75Grade S320 to 405.Ordering Information5.1 ColorThe commercial color specified should be pre-ceded by the words“unfading”or“semi-weathering”or“weathering”to indicate the allowable change in the originalslate color,over time,upon exposure on the roof.5.2 Standard RoofsSloping roofs utilizing a nominalthickness of14in.6 mm,are known as standard roofs.Theseshingles shall be rectangular unless otherwise specified.Theseshingles shall be machine punched or drilled for two nailslocated for the required headlap and installation methods.5.3 Textural RoofsSloping roofs utilizing various sizes,thicknesses,textures,and colors for architectural effects,areknown as textural roofs.These shingles shall be machinepunched or drilled for two nails located for the requiredheadlap and installation methods.5.4 Graduated RoofsSloping roofs utilizing a greaterrange of sizes,thicknesses,and exposed lengths of shingles,are known as graduated roofs.The slates are arranged on theroof so that the thickest and longest occur at the eaves andgradually diminish in size and thickness toward the ridges.These shingles shall be machine punched or drilled for twonails located for the required headlap and installation methods.1This specification is under the jurisdiction of ASTM Committee C18 onDimension Stone and is the direct responsibility of Subcommittee C18.03 onMaterial Specifications.Current edition approved April 1,2015.Published May 2015.Originallyapproved in 1957 as C406 57 T.Last previous edition approved in 2010 asC406 10.DOI:10.1520/C0406_C406M-15.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Physical Requirements6.1 Slate supplied under this specification shall conform tothe physical requirements listed in Table 1 and be no thinnerthan the thickness of the average of the test samples reportedunder Test Methods C120/C120M.6.2 Slates with broken corners on the exposed ends shall notbe installed when either the base or leg of the right triangularpiece broken off is greater than 112in.40 mm.Slates withbroken corners are acceptable for cutting stock.6.3 The curvature of shingles shall not exceed18in.in 12 in.3 mm in 300 mm.Cu