Cll.2 GO-73 A UNITED STATES DEPARTMENT OF COMMERCE PUBLICATION ""v."* oX Voluntary Product Standard PS 60-73 U.S. DEPARTMENT OF COMMERCE National Bureau of Standards HARDBOARD SIDING American National Standards Institute ^^ American National Standard A/B5.6-1973 fe x UNITED STATES DEPARTMENT OF COMMERCE • Frederick B. Dent. Secretary NATIONAL BUREAU OF STANDARDS • Richard W. Roberts. Director Voluntary Product Standard PS 60-73 Hardboard Siding Approved by the American National Standards Institute on December 18. 1973, as American National Standard A 135.6—1973 Abstract This Voluntary Product Standard covers requirements and methods of test for the dimensions, straightness, squareness, physical properties, and surface characteristics of hardboard siding. Definitions of trade terms used and methods of identifying products that comply with the standard are included. Key words Hardboard siding; siding, hardboard. Nat. Bur. Stand. (U.S.), Prod. Stand. 60-73. 7 pages (Feb. 1974) CODEN: XNPSAX For sale by the Superintendent of Documents. U.S. Government Printing Office. Washington. D.C. 2040- (Order by SD Catalog No. C13.20/2 :60-73). Price 40 cents n. o u a B Contents Page 1. Purpose 1 2. Scope and Classification 1 2.1. Scope 1 2.2. Classification 1 3. Requirements 1 3.1. General 1 3.2. Dimensions and tolerances 1 3.3. Edge straightness 1 3.4. Squareness 1 3.5. Physical properties 1 3.6. Face surface characteristics 2 3.7. Linear expansion 2 4. Inspection and Test Procedures 4 4.1. Weatherability of substrate 4 4.2. Sealing quality of primer coat 4 4.3. Weatherability of primer coat 4 5. Definitions 5 6. Effective Date and Identification 5 7. History of Project 5 8. Standing Committee 5 Appendix 5 VOLUNTARY PRODUCT STANDARDS Voluntary Product Standards are developed under procedures published by the Department of Com- merce in Part 10, Title 15, of the Code of Federal Regulations. The purpose of the standards is to establish nationally recognized requirements for products, and to provide all concerned interests with a basis for common understanding of the characteristics of the products. The National Bureau of Stand- ards administers the Voluntary Product Standards program as a supplement to the activities of the private sector standardizing organizations. Establishment of a VOLUNTARY PRODUCT STANDARD The role of the National Bureau of Standards in the establishment of a Voluntary Product Standard is to (1) act as an unbiased coordinator in the development of the standard, (2) provide editorial assistance in the preparation of the standard, (3) supply such assistance and review as is required to assure the technical soundness of the standard, (4) seek satisfactory adjustment of valid points of dis- agreement, (5) determine the compliance with the criteria of the Department's procedures, (6) pro- vide secretarial functions for each committee appointed under the Department's procedures, and (7) publish the standard as a public document. Producers, distributors, users, consumers, and other interested groups contribute to the establishment of a Voluntary Product Standard by (1) initiating and participating in the development of the stand- ard, (2) providing technical or other related counsel as appropriate relating to the standard, (3) promoting the use of and support for the standard, and (4) assisting in keeping the standard cur- rent with respect to advancing technology and marketing practices. Use of a VOLUNTARY PRODUCT STANDARD The use of a Voluntary Product Standard is voluntary: the National Bureau of Standards has no regulatory power in the enforcement of the provisions of the standards. However, since the standards represent a consensus of all interested groups, their provisions are likely to become established as trade customs. In addition, when a standard is made a part of a legal document, such as a sales con- tract or code, compliance with the standard is enforceable. The benefits derived from Voluntary Product Standards are in direct proportion to their general recognition and actual use. Producers and distributors whose products meet the requirements of a Voluntary Product Standard may refer to the standard in advertising and on labels to promote greater public understanding of or confidence in their products. Purchasers may order products con- forming to the requirements of the standards. For copies of the Voluntary Product Standards procedures or for more information concerning the development and use of these standards, you may write to: Office of Engineering Standards Services: National Bureau of Standards: Washington. D.C. 20234. Voluntary Product Standard PS M 73 Hardboard Siding Effective October 23, 1973 (See section 6.) (This Standard, which was initiated by the American Hardboard Association, has been developed under the Procedures for the Development of Voluntary Product Standards of the U.S. Department of Commerce. See Section 7, History of Project, for further information.) 1 . PURPOSE The purpose of this Voluntary Product Standard is to establish nationally recognized dimensional and quality requirements for hardboard siding and to provide producers, distributors, and users with a basis for common understanding of the characteristics of this product. 2. SCOPE AND CLASSIFICATION 2.1. Scope— This Voluntary Product Standard covers requirements and methods of test for the di- mensions, straightness, squareness, physical proper- ties, and surface characteristics of hardboard siding. 1 Definitions of trade terms used and methods of iden- tifying products that comply with this Standard are included. Note: As an aid in correlating U.S. customary units to metric units, conversion factors for the units used in this Standard are given in an appendix. 2.2. Classification — This Standard covers the following types and surfaces of hardboard siding: Types : Lap Siding — After installation, yields a pat- tern of overlapped planks. This siding may either be embossed or smooth on the face. Panel siding — After installation, yields a flush surface. This siding may be either embossed, grooved, or smooth on the face. Surfaces: Unprimed — Siding that has only the surface characteristics provided by the basic manufacturing process. Primed — Siding that has been coated with a primer to provide a surface more receptive to paint. 3. REQUIREMENTS 3.1. General — Products represented as complying with this Voluntary Product Standard shall meet all of the requirements specified herein. The inspection 1 Other Voluntary Product Standards cover : a. Basic hardboard b. Prefinished hardboard paneling and test procedures contained in sections 3 and 4 are to be used to determine the conformance of products to the requirements of this Voluntary Product Stand- ard. Each producer or distributor who represents his products as conforming to this Standard may utilize statistically based sampling plans which are appro- priate for each particular manufacturing process but shall keep such essential records as are necessary to document with a high degree of assurance his claim that all of the requirements of this Standard have been met. Additional sampling and testing of the product, as may be agreed upon between purchaser and seller, is not precluded by this section. 3.2. Dimensions and tolerances — The dimen- sions and tolerances for the siding shall be as speci- fied in table 1. Thickness shall be determined in ac- cordance with sections 146-149 of American Society for Testing and Materials (ASTM) D 1037-72a, Standard Methods of Evaluating the Properties of Wood-Base Fiber and Particle Panel Materials. 2 3.3. Edge straightness— The edges of the siding shall be straight within 1/64 inch for each foot of length or width. Edge straightness shall be determined by stretching a string or wire from one corner to the adjacent corner and measuring the widest distance between the string or wire and the siding edge being tested. 3.4. Squareness — The difference between the lengths of the face diagonals shall not vary by more than 1/64 inch for each foot of length of the siding. Opposite sides of the siding shall not vary in length more than % inch. 3.5. Physical properties— The siding shall be manufactured primarily of inter-felted ligno-cellulosic fibers, consolidated under heat and pressure in a hot- press to a density of not less than 31 pounds per cubic foot, and shall have the properties specified in table 2 when tested in accordance with the test methods indicated therein. Specimens shall be selected for testing as diagramed in figure 1. 2 Later issues of this publication may be used providing the requirements are applicable and consistent with the issue designated. Copies are obtainable from the American Society for Testing and Materials. 1916 Race Street. Philadelphia. Pa. 19103. Table 1. Dimensions and tolerances for hard board siding Dimensions (nominal) Tolerances Length Width a Thickness Length and width Thickness Type of siding nominal thickness min - max Lap siding feet 4 through 16 in 2-foot increments inches 4, 6, 8, 9, 10 and 12 inches 3/8 7/16 inches plus minus 1/8 for all lengths and widths inches 1/4 (0.250) 3/8 (.3751 7/16 (.438) inches 0.220-0.265 Panel siding 4, 6, 7 8, 9, 10 and 12 48 1/4 3/8 7/16 .325- .375 .376- .450 11 Pertains to the exposed width; actual width may be greater due to certain edge details such as shiplapped edges. 3.6. Face surface characteristics — All face characteristics shall be uniform in appearance and shall be as free from visible defects in the surface plane as commercially practicable when visually in- spected by an individual competent in the field. 3.7. Linear expansion — The siding shall meet the maximum linear expansion requirements speci- fied in table 3 when tested in accordance with sections 107-110 and Note 39 of ASTM D 1037-72a; except that, the test specimens for lap siding shall be cut parallel with the long dimension of the siding. Figure 1. Test specimen cutting diagram for hardboard siding. Lap siding uj 2 UJ H A B C D E, F . E 2 F 3 Gi H, H 2 I| F 3 3 b ) G 2 / . 6 F 2 I 2 F 4 3 6 12 6 6 * 3 3 3 3 3 7 9 9 12 6 5 10 -* 96 12" Panel siding 12 6 12 _ 6 2-3/4 6 2 or r- o LU 48 EDGE TRIM B Ei EDGE TRIM r l 31 3i 10 7 ' 6 ' A-Water absorotion and thickness swelling B-Weatherability of substrate C-Sealing duality of primer coat D-Weatherabilitv of primer coat E-Nail-head Dull- -through and lateral nail resistance F-Modulus of rupture G-Hardness H-Impact I -Linear exnansion 48 a/ Grooved panels shall be cut so that all strength properties are tested on the ungrooved sections of the board . When Ian siding is fabricated in narrower widths than shown in the cutting diagram, the snecimens shall be the maximum width possible . Modulus of runture specimens shall be long enough to provide for the renuired span plus 2 inches . All dimensions are in inches. 3d o ■ : F" 1 o — i ! M oj co en H "77^ hn JS » 3 l -a o -E ■^8 „ wa 1-a cu -a c a T3 E cu .5 E 5. "C s 9.3 ■3 5 . ft e be O.S O "2 £* =o 5 * 0)3 3-2 & o "' cu ~ 3S -e eof— "° c a; '3 . a a, g *.g l) E -Q a, E- 1 3 — -a 2 CO _, CU e- -c ^ — i .5 '/J CO — .§ S | & £ B-S ¥ E-S *■> d ex c ^3 U . 4) ■ S a' 11 m -i r- 5 CC^ -a — cm 5 CU c ^H 5 Z-° cu^ ~ J —'So : J3 a -2 J O CCJ Q, V o z 3 _ p — . =1 3. >-. C E OJ c E oj .a a o 00 Q. J5 >> E _ 2 E ." ° c oj: ^00 CU CO -a 3. 3 = CD O 6 a _ a o 3 Cu eft en B 9 ~ cu -S * *j cu — -o & m OJ CD co «* in ^ to en g - ~ CU o > CU CO _eu IE j= o _E co «5 IS a u o o H tu T3 a eft co eU _E C •2 3 to a S On cu cn o o.So o -rt © co 72 © "— I CO CO 3 a 3 > -3 « -a b si ffi^ © CU r~ > S S.2- 1 >-« B J eft -3 3 E © tu -O o CO £ O EN'S B E £ ^ S J3 B •" B .§b" *3 on E 2 cu CS a O, en J3 B ■" CN-d -2 cu Sstss O 3 C cu 3 U g B ©JO « tS 8 2S S 1/1 h s o *» 3 E CO tu J3 t- q i , bll co -a 2 cu Q 1 CO a B E 9 !- ■/i (J H-B > E c o u C/3 ■— < "o -fi u. c "0 'S . -3 S © en S « § 1 U O J3 Q e- 3 N — CU eft eft "S co E cu •" eft 3 p *j rv B '-3 .1*1 a * e co a eu MH — en CO j3 3 a a a i o m 3 o o cu S -3 .5 1 .a s * s^-g s b s*a a 3: 5 ■3 "3 ^-S cu °.a a S - e" tf *e <^^ eu .5 o o .9*8 | co >i £ § co cu B 3c3 Table 3. Maximum linear expansion Type of siding Thickness range Maximum linear expansion Lap inches 0.325-0.375 over 0.376 percent 0.38 0.40 Panel 0.220-0.265 0.325-0.375 over 0.376 0.36 0.38 0.40 4. INSPECTION AND TEST PROCEDURES 4.1. Weatherability of substrate — A. Apparatus — The apparatus shall consist of a forced-air-circulating oven, a micrometer reading to 0.001 inch, and a controlled temperature bath. B. Test specimen — Primed specimens shall be tested as received. Unprimed specimens shall be primed on the face side only with a primer meeting the requirements of Federal Specification TT-P-25c Primer Coating, Exterior (Undercoat for Wood, Ready-Mixed, White and Tints),* applied at a rate of 450 square feet per gallon. The edges of the speci- mens shall not be primed. C. Procedure — 1 1 I Condition the specimen in the oven at 135 °F for 24 hours. 1 2 1 Remove the specimen from the oven and measure its thickness to the near- est 0.001 inch at the midpoint of its four sides. % inch in from the edge. (3) Five minutes after removal from the oven, immerse the specimen face down in 1 inch of water which is maintained at 70±2 °F. Position the specimen with small sup- ports so that the face is 0.05 to 0.10 inch below the water surface and leave immersed for 4 hours. (4) Remove the specimen from the water and remeasure it as described in (2) above. 1 5 I Place the specimen in the oven at 135 °F for 20 hours. 6) Repeat steps (2) through for a total of five cycles. 5) D. Calculation and inspection — The average increase in thickness of the four measurements de- scribed in (2) above, between an oven-dried and water-immersed condition, shall be calculated for each 3 Later issues of this publication ma.v be used providing the requirements are applicable and consistent with the issue designated. Copies of Federal Specifications are available from Specification Sales (3PRDS) Bldg. 197. Washington Navy Yard, General Services Administration. Washington. P.P. 20407. cycle. Any fiber raising observed after the fifth cycle shall be reported. 4.2. Sealing quality of primer coat — A. Material — Paint meeting the requirements of Federal Specification TT-P-105a, Paint, Oil: Chalk-Resistant, Lead-Free, Exterior Ready-Mixed, White and Tints. 5 B. Procedure — Apply one coat of paint by brush to the primed test specimen at a rate of 500 square feet per gallon. Allow the paint to dry for 24 hours and examine the test specimen for any flatten- ing of the paint caused by penetration. Flattening caused by scratches or other damage to the primer coat from improper handling should be disregarded. 4.3. Weatherability of primer coat — A. Apparatus — A weathering appliance of Type D or DH as described in ASTM E 42-69, Recommended Practice for Operating Light- and Water-exposure Apparatus (Carbon- Arc Type) for Exposure of Nonmetallic Materials, 4 and paint meet- ing the requirements of Federal Specification TT-P- 105a. B. Procedure — (1) The primed siding specimen shall be placed in the weathering appliance and tested for 3 weeks using the following cycle : (a) Expose the specimen to 102 minutes of light only followed by 18 minutes of light with a spray. (b) Repeat (a) for a total of 20 hours. |c) Allow the specimen to rest for 4 hours. (d) Repeat (a), (b), and (c) for 5 days and then allow the specimen to rest for 48 hours. (2) After 3 weeks, the specimen shall be brush-painted with one coat at a spreading rate of 500 square feet per gallon. Allow the paint to dry for 1 week before exposing the specimen for an additional 9 weeks in the weather- ing appliance, cycled as described in (1) above. C. Inspection — Inspect for any visible defect (checking, cracking, erosion, or flaking) after 3 weeks, before painting; and after 13 weeks. See footnote 2. page 1 5. DEFINITIONS For the purposes of this Standard, the following definitions shall apply: Checking — Slight breaks in the primer coat that do not penetrate the substrate. Cracking — Breaks in the primer coat which allow the substrate to become visible. Erosion — The wearing away of the primer coat to expose the substrate. Fiber raising — The swelling of individual wood fibers on the board surface which causes them to be raised above the plane of the board surface. Flaking — The detachment of the primer coat from its substrate. a standard for hardboard siding under the Procedures for the Development of Voluntary Product Standards. A proposed standard was submitted to the Standing Committee in May 1973. The recommended Standard was then circulated for acceptance in July 1973. The responses to this circulation indicated consensus among producers, distributors, and users in accord- ance with the published procedures. The new standard was designated Voluntary Product Standard PS 60-73, Hardboard Siding, and became effective on October 23, 1973. Technical Standards Coordinator: Karl G. Newell, Jr., Office of Engineering Standards Services, National Bureau of Standards, Wash- ington. D.C. 20234 8. STANDING COMMITTEE 6. EFFECTIVE DATE AND IDENTIFICATION The effective date of this Standard is October 23. 1973. As of the effective date, reference to PS 60-73 may be made in contracts, codes, advertising, in- voices, product labels, and the like, but no product may be advertised or represented in any manner which would imply or tend to imply approval or endorsement of that product by the National Bureau of Standards, the Department of Commerce, or by the Federal Government. The following statements are suggested for use in representing products as conforming to all require- ments of this Standard: (1) "This (lap or panel) (primed or unprimed), hardboard siding conforms to all require- ments established in Voluntary Product Stand- ard PS 60-73, developed and published in accordance with the U.S. Department of Com- merce Procedures for the Development of Voluntary Product Standards. Full responsi- bility for the conformance of this product to the standard is assumed by (name and address of producer or distributor)." (2) "Conforms to PS 60-73. (lap or panel), (primed or unprimed) (name and address of producer or distributor) ." 7. HISTORY OF PROJECT In 1969. the American Hardboard Association re- quested that the National Bureau of Standards initiate A Standing Committee has been appointed to assist in keeping this Voluntary Product Standard up to date. The names of the members of the committee are available from the Office of Engineering Standards Services, Washington, D.C. 20234. which serves as the secretariat of the committee. APPENDIX The conversion factors and units contained in this appendix are in accordance with the International System of Units (abbreviated SI for Systeme Inter- national d'Unites). The SI was defined and given official status by the 11th General Conference on Weights and Measures which met in Paris in October 1960. For assistance in converting U.S. customary units to SI units, see ASTM E 380, ASTM Standard Metric Practice Guide, available from the American Society for Testing and Materials, 1916 Race Street. Philadelphia. Pa. 19103. The conversion factors for the units found in this Standard are as follows: 1 inch = 25.4 millimeters 1 foot = 0.3048 meter 1 pound per square inch = 6.894 757 XlO 3 pascals 1 pound-force = 4.448 222 newtons t c = (t F — 32) /1.8 where: t c = temperature in degrees Celsius t = temperature in degrees Fahrenheit Digitized by the Internet Archive in 2012 with funding from LYRASIS Members and Sloan Foundation http://www.archive.org/details/hardboardsidingOOunit NATIONAL BUREAU OF STANDARDS The National Bureau of Standards' was established by an act of Congress March 3, 1901. The Bureau's overall goal is to strengthen and advance the Nation's science and technology and facilitate their effective application for public benefit. 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