1、 ANSI/BHMA A156.21-2014 Revision of ANSI/BHMA A156.21-2009 AMERICAN NATIONAL STANDARD FOR THRESHOLDS AMERICAN NATIONAL STANDARDS INSTITUTE Approved December 5, 2014 SPONSOR BUILDERS HARDWARE MANUFACTURERS ASSOCIATION, INC. 2 AMERICAN NATIONAL STANDARD An American National Standard implies a consensu
2、s of those substantially concerned with its scope and provisions. An American National Standard is intended as a guide to aid the manufacturer, the consumer and the general public. The existence of an American National Standard does not in any respect preclude anyone, whether he has approved the Sta
3、ndard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the Standard. American National Standards are subject to periodic review and users are cautioned to obtain the latest editions. CAUTION NOTICE: This American National Standard may b
4、e revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken to reaffirm, revise, or withdraw this Standard no later than five years from the date of publication. Purchasers of American National Standards may receive current information
5、 on all Standards by calling or writing The American National Standards Institute. Published by BUILDERS HARDWARE MANUFACTURERS ASSOCIATION, INC. 355 Lexington Avenue New York, New York 10017 Copyright 2014 by the Builders Hardware Manufacturers Association, Inc. Not to be reproduced without specifi
6、c authorization from BHMA Printed in the USA This Standard was developed by the Builders Hardware Manufacturers Association, Inc. It was approved by ANSI under the Canvass Method. BHMA was accredited on 21 March 1983 as a sponsor using the Canvass Method. 3 FOREWORD (This Foreword is not a part of A
7、NSI/BHMA A156.21) The general classification of builders hardware includes a wide variety of items which are divided into several categories. To recognize this diversity, a sectional classification system has been established. Architectural Door Trim, Thresholds and Gasketing, is one such section an
8、d this Standard is the result of the collective efforts of members of the Builders Hardware Manufacturers Association, Inc. who manufacture these products. The total Product Standards effort is, therefore, a collection of sections, each covering a specific category of items. Strength and gasketing t
9、ests, fastening systems and, where it has been necessary, material and dimensional requirements have been established to ensure safety and stability to which the public is entitled. There are no restrictions on design except for those dimensional requirements imposed for the reasons given above. Thi
10、s Standard is not intended to obstruct but rather to encourage the development of improved products, methods and materials. The BHMA recognizes that errors will be found, items will become obsolete, and new products and methods will be developed. With this in mind, the Association plans to update, c
11、orrect and revise these Standards on a regular basis. It shall also be the responsibility of manufacturers to request such appropriate revisions. The BHMA numbers which indicate functions of thresholds do not identify size or design and are not intended to be used without necessary supplementary inf
12、ormation. Individual manufacturers catalogs are consulted. 4 TABLE OF CONTENTS 1. SCOPE .5 2. DEFINITIONS .5 3. GENERAL .6 4. TESTS REQUIREMENTS 6 5. TYPES .8 6. EXPLANATION OF NUMBERING SYSTEM 9 APPENDIX A 13 5 1. SCOPE 1.1 This Standard establishes requirements for thresholds. Types are described
13、with identifying numbers. Strength tests, fastening systems, and gasketing tests are included. 1.2 Tests described or referenced in this Standard are performed under laboratory conditions. In actual use, results vary because of installation, maintenance, and environmental conditions. 2. DEFINITIONS
14、2.1 Threshold A horizontal member installed beneath a closed door or in a wall opening. 2.1.1 Compressing Top Threshold A threshold with a compressible seal which seals against the bottom of the door. 2.1.2 Flat Saddle. A threshold with a flat top that is smooth or fluted. 2.1.3 Half Saddle A thresh
15、old with a flat top that is smooth or fluted and lies flush with an offset. 2.1.4 Interlocking Threshold A threshold with a lip which engages a hook strip applied to a door. 2.1.4.1 Hook Strip A member applied to the bottom or face of a door that engages an interlocking threshold and thus contribute
16、s to inhibiting the passage of air, water, or air borne particles. 2.1.5 Rabbeted Threshold A threshold with an integral stop that a door closes against. May include a gasket. 2.1.6 Latching/Panic Thresholds A threshold with an integral stop that the door closes against and shaped to provide a latch
17、ing element for the bottom latches of surface mounted vertical rod devices. May include a gasket. 2.1.7 Plate Threshold A solid flat threshold with a flat top that is smooth or fluted. 2.1.8 Ramped Threshold A threshold with a continuous incline. 2.1.9 Saddle Threshold for Floor Closer A threshold t
18、hat has been prepared for use with a floor closer. 2.1.10 Thermal Barrier Threshold A multipart threshold separated by material that inhibits the transfer of heat or cold. 6 3. GENERAL 3.1 Reference to other Standards ANSI Standards are available from BHMA at or the American National Standards Inst
19、itute, 11 West 42nd Street, New York, NY 10036. 3.2 Values Required values in this Standard are given in US units. SI (metric) equivalents are approximate. 3.3 Tolerances Dimensions referenced in this Standard are nominal and are permitted to be reduced or exceeded at the manufacturers option within
20、 commercially accepted practices 1/16 in (1.6 mm) unless otherwise indicated. 3.4 Screw Fasteners 3.4.1 Fasteners shall be of stainless steel, plated steel, or non-ferrous material with a finish compatible with the threshold. 3.4.2 The length of screws used shall be determined by the height of the t
21、hreshold with a minimum of 3/4 in (19 mm) thread engagement in the floor or anchoring device used. 3.4.3 If wood screws are used, they shall be no smaller than number 10. 3.4.4 If machine screws are used, they shall be no smaller than number 10 and shall be furnished with anchors. 3.4.5 Thresholds a
22、ffixed to the floor independent of any fastening affixing the threshold to the jamb shall have a minimum of one fastening per foot of threshold length spaced in accordance with the individual manufacturers practice with a minimum of three fastenings. 3.5 Thresholds used in fire door assemblies shall
23、 be of noncombustible material and comply with the requirements of ANSI/NFPA 80-2013 Fire Doors and Windows Standard. 3.6 Thresholds used in openings required by code to be accessible shall comply with the slope and height requirements of ICC/ANSI A117.1-2009 Accessible and Usable Buildings and Faci
24、lities and 2010 ADA Standards for Accessible Design. 4. TESTS REQUIREMENTS 4.1 Threshold Compressive Load Test for Standard Duty Thresholds (1000 lbf load) 4.1.1 Test Fixture Provide a loading device having a flat bed large enough to accept a threshold test specimen and that will not deflect when th
25、e specified load is applied. The load shall be measured with a dial or digital gage having a combined calibration and reading accuracy within 2%. All threshold measurements are to be taken with a gage accurate within .001 in. (.025mm). Use a 1/4 in. (6.3 mm) thick cold rolled steel plate 3/4 in. (19
26、 mm) wide and 3 in. (76.2 mm) long connected to a 3/4 in. (19 mm) diameter steel rod with a maximum length of 6 in. (152mm) for transferring the load to the threshold surface. The fixture shown in the Figure below shall be used to apply the load to the specimen surface, and with support on one side
27、only to prevent the specimen from sliding. The swivel mount is intended to maintain full plate contact on sloping thresholds. 7 Suggested Standard Duty Test Fixture 4.1.2 Procedure Place a 12 in. (305mm) long threshold specimen on the flat bed. The before and after measurements shall be taken at the
28、 same position. This single position shall be at the center of the length of the specimen and at the center of the widest span between two adjacent support points, including those which contact the bed under load. Orient the steel plate centered with the 3 in. (76mm) dimension in the direction of th
29、e threshold length. Gradually apply a downward compressive load within 20 seconds 5 seconds until a reading of 1000 lbf (4448 N) is reached. After 15 minutes 30 seconds at the specified load, remove the load and re-measure the height of the specimen. Permanent set shall not exceed 0.040 in. (1.02mm)
30、. 4.2 Threshold Compressive Load Test for Heavy Duty Thresholds (10,000 lbf load) 4.2.1 Test Fixture Provide a loading device having a flat bed large enough to accept a threshold test specimen and that will not deflect when the specified load is applied. The load shall be measured with a dial or dig
31、ital gage having a combined calibration and reading accuracy within 2%. All threshold measurements are to be taken with a gage accurate within .001 in. (.025mm). Use a 3 in. (76.2 mm) thick cold rolled steel plate 1 in. (38.1 mm) wide and 3 in. (76.2 mm) long connected to a 1 in. (38.1 mm) diameter
32、steel rod with a maximum length of 6 in. (152 mm) for transferring the load to the threshold surface. The fixture shall be configured to apply the load to the specimen surface, and with support on one side only to prevent the specimen from sliding. The swivel mount is intended to maintain full plate
33、 contact on sloping thresholds. 4.2.2 Procedure HD Place a 20 in. (508 mm) long threshold specimen on the flat bed. The before and after measurements shall be taken at the same position. This single position shall be at the center of the length of the specimen and at the center of the widest span be
34、tween two adjacent support points, including those which contact the bed under load. Orient the steel plate centered with the 3 in. (76.2 mm) dimension in the direction of the threshold length. Gradually apply a downward compressive load within 120 seconds 5 seconds until a reading of 10000 lbf (44.
35、5 kN) is reached. After 5 minutes 30 seconds at the specified load, remove the load and re-measure the height of the specimen. Permanent set shall not exceed 0.040 in. (1.02 mm). 1 , 0 0 0 L B F O R C ET H R E S H OL DS P E C I M E N1 / 4 “ x 3 / 4 “ x 3 “C O L D R OL L E DS T E E L P L A T ES W I V
36、 E L M O U N T3 / 4 “ x 6 “S T E E L R ODF L A T P L A T E1 , 0 0 0 L B . F O R C EGU A G E 5 L B S .F I X E D S T O P :T O P R E V E N TM OV E M E N TD U R I N G T E S T8 Threshold Gasketing Material Tests 4.3 When gasketing is part of a threshold it shall meet the Heat Test and Cold Test requireme
37、nts of ANSI/BHMA A156.22 2012, Gasketing. 5. TYPES 5.1 When using any of the following type numbers, the finish, height, width, length and screw fasteners required shall be specified in addition to the following type numbers. Consult individual manufacturers catalogs for availability. When the thres
38、hold is to be used with a vertical rod exit device, it shall also be specified if the threshold is to act as the latch holder. 5.2 The illustrations shown are typical and are not requirements for product design. 5.3 The design and type of thresholds are not limited by the following examples. Thresho
39、lds not shown are described using the numbering system provided. Refer to manufacturers catalogs so as to not devise a number describing a product that does not exist. 5.4 Illustrations, Type Descriptions, and Type Numbers 5.4.1 Compressing Top Thresholds Compressing top threshold, fluted surface. J
40、31100 5.4.2 Saddle Thresholds Saddle threshold, smooth surface. J12300 J32300 Saddle threshold, fluted surface, offset. J12180 J32180 Saddle threshold, fluted surface, thermal barrier. J12190 J32190 Saddle threshold, fluted surface, applied stop with gasket. J12120 J32120 Saddle threshold, fluted su
41、rface, carpet separator. J12140 J32140 Saddle threshold, fluted surface, barrier free. J12130 J32130 5.4.3 Half Saddle Thresholds Half saddle threshold, fluted surface. J13100 J33100 5.4.4 Interlocking Thresholds Interlocking threshold, single lip, smooth surface. Hook strip applied to door. J14370
42、J34370 Interlocking threshold, double lip, fluted surface. Hook strip applied to door. J14170 J34170 Interlocking threshold, water return, smooth surface. Hook strip applied to door. Drain pan supplied when specified. J14370 J34370 5.4.5 Rabbeted Thresholds Rabbeted threshold, fluted surface. J15100
43、 J35100 Rabbeted threshold, fluted surface, with gasketing. J16100 J36100 5.4.6 Latching Panic Threshold Specify if being used with a vertical rod exit device. Latching panic threshold, fluted surface, barrier free. J15130 J35130 Latching panic threshold, fluted surface, with gasketing. J16100 J3610
44、0 5.4.7 Plate Thresholds Plate threshold, fluted surface. J17100 J37100 5.4.8 Ramped Thresholds (for accessible openings) Ramped threshold, fluted surface, barrier free. (May have multiple elements and miter returns) J18130 J38130 5.4. Saddle Thresholds for Floor Closers Specify type and the closer
45、being used. Threshold prepared for floor closer, Type A. For center hung. Ends not mitered. Smooth surface. J19300 J39300 Threshold prepared for floor closer, Type B. For offset hung. Both ends mitered. Smooth surface. J19350 J39350 Threshold prepared for floor closer, Type C. For center hung. Both
46、ends mitered. Smooth surface. J19350 J39350 Threshold prepared for floor closer, Type D. For offset hung. Both ends mitered. Smooth surface. J19350 J39350 6. EXPLANATION OF NUMBERING SYSTEM 6.1 The first character denotes the BHMA organizational Section (J), Architectural Door Trim, and designates T
47、hresholds 6.2 The second character indicates the general type of material used: 1 Architectural brass or bronze 3 Aluminum 5 Stainless steel 7 Rubber and similar non-metallic materials 0 Other 6.3 The third character identifies the configuration type of the threshold: 1 Compressing Top 6 Rabbeted, L
48、atching/Panic with Gasket 2 Flat Saddle 7 Plate 3 Half Saddle 8 Ramped 4 Interlocking 9 Saddle for Floor Closer 5 Rabbeted, Latching/Panic 0 None Designated 6.4 The fourth character indicates the surface type of the threshold: 1 Fluted Surface 2 Fluted Slip Resistant Surface 3 Smooth Surface 4 Smoot
49、h Slip Resistant Surface 6.5 The fifth character designates a further description of the type of threshold: 1 Applied Stop 6 Expansion Assembly 2 Applied Stop with Gasket 7 Hook Strip Applied to Door 3 Barrier Free (See 3.6) 8 Offset 4 Carpet Separator 9 Thermal Barrier 5 Ends Mitered 0 None Designated 6.6 The sixth character also designates a further description of the type of threshold. It is used when more than one description identified by the fourth numeral is needed: 1 Applied Stop 6 Expans
