1、Designation: D4756 15 An American National StandardStandard Practice forInstallation of Rigid Poly(Vinyl Chloride) (PVC) Siding andSoffit1This standard is issued under the fixed designation D4756; the number immediately following the designation indicates the year oforiginal adoption or, in the case
2、 of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This practice covers the basic requirements for and themethods of installation of rigid vin
3、yl siding, soffits, andaccessories on the exterior wall and soffit areas of buildings. Inall applications, refer also to the specific manufacturersinstallation instructions and the requirements of applicablebuilding codes.1.2 This practice covers aspects of installation relating toeffectiveness and
4、durability in service.1.3 The various application systems are located in thefollowing sections of this practice:Substrate, Surface Preparation Section 8Application of Horizontal Siding Section 9Application of Vertical Siding Section 10Application of Soffits and Fascia Section 11Special Details Secti
5、on 121.4 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.5 This standard does not purport to address all of thesafety concerns, if any,
6、 associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.NOTE 1There is no known ISO equivalent to this standard.2. Referenced Documents2.1 ASTM Standar
7、ds:2D883 Terminology Relating to PlasticsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD3679 Specification for Rigid Poly(Vinyl Chloride) (PVC)SidingD4477 Specification for Rigid (Unplasticized) Poly(VinylChloride) (PVC) SoffitE631 Terminology of Building ConstructionsE2112 Practice fo
8、r Installation of Exterior Windows, Doorsand Skylights3. Terminology3.1 GeneralDefinitions are in accordance with Terminolo-gies D883 and E631 and abbreviations with TerminologyD1600 unless otherwise indicated.3.2 Definitions of Terms Specific to This Standard:3.2.1 backerboarda flat material used o
9、n the face of thehouse, applied between the studs and the siding (or overexisting wall surface) to provide an even surface for theinstallation of the vinyl siding.3.2.2 buttlockthe bottom of a siding or soffit panel, oraccessory piece, opposite the nail hem, which locks onto thepreceding panel.3.2.3
10、 crimpsmall protrusions, typically approximately12in. (12.7 mm) long,18 in. (3.2 mm) wide, and projecting18 in.(3.2 mm) formed by a crimper (snaplock punch). (See Fig. 2.)3.2.4 crimpera special hand tool designed to form crimps(snaplock ears) intended to hold partial panels in place. (SeeFig. 2.)3.2
11、5 face nailthe action of fastening directly on to the“face,” or exposed surface, of a panel (instead of using the nailslot).3.2.6 fasciathe trim covering the ends of roof rafters. (SeeFig. 1.)3.2.6.1 fascia boarda board attached to the ends of therafters between the roofing material and the soffit
12、overhang.3.2.6.2 fascia cap or coverthe covering around a fasciaboard.3.2.7 flashingspecial membrane pieces or manufacturedtrim pieces used to supplement siding panels in weatherprotection around joints, penetrations, and openings, such aswindows, doors, mechanical penetrations, and roof-wall1This p
13、ractice is under the jurisdiction ofASTM Committee D20 on Plastics andis the direct responsibility of Subcommittee D20.24 on Plastic Building Products.Current edition approved Feb. 1, 2015. Published February 2015. Originallyapproved in 1991. Last previous edition approved in 2013 as D4745 13. DOI:1
14、0.1520/D4756-15.2For 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.*A Summary of Changes section appears at the
15、end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1intersections, designed and intended to move incidental waterto the building exterior.3.2.8 furring/furring stripa wooden or steel framingmaterial, usually a nominal
16、1 by 2 in. (25.4 by 50.8 mm) usedto even the surface in preparation for installation of siding. To“fur” a surface means to apply these strips.3.2.9 nailslot puncha special hand tool used to create slotsfor attachment of field-modified siding or accessories. (See Fig.3.)3.2.10 rake (roof)the inclined
17、 usually projecting edge ofa sloping roof.3.2.11 rake (wall)the board or molding placed along thesloping sides of a gable to cover the ends of the siding.3.2.12 snaplock earssee crimp and Fig. 2.3.2.13 snaplock punchsee crimper and Fig. 2.3.2.14 sofftthe underside surface (typically horizontal) ofr
18、oof overhangs.3.2.15 starter stripan accessory applied directly to thesurface of the building and used to secure the first course ofsiding to the home. Starter strips can either be a part manufac-tured for the specific purpose or created by cutting the nailinghem and adjacent lock from a siding pane
19、l.3.2.16 undersill trim (utility trim)an accessory strip usedto receive and hold the crimped edge of horizontal or verticalsiding that has had its normal lock removed.3.2.17 zip tool (unlocking tool)a special hand tool used toseparate interlocked siding panels. (See Fig. 2.)4. Delivery of Materials4
20、1 All manufactured materials shall be delivered in theoriginal packages, containers, or bundles bearing the size ortype product, or both, brand name, and manufacturer (orsupplier) identification, manufacturers lot number, and theASTM specification to which it conforms.5. Protection of Materials5.1
21、Do not store in any location or in any manner where thetemperature of the siding, soffit or accessories is likely toexceed 130F (54C).FIG. 1 Terminology for Buildings, Siding and AccessoriesFIG. 2 Siding Installation ToolsD4756 1525.2 Store the cartons on a flat surface and support the entirelength
22、of the cartons.5.3 Store the cartons away from areas where falling objectsor other construction activity could impact the cartons. Keepthe cartons dry.5.4 Do not store the cartons in stacks more than 6 boxeshigh.6. Environmental Conditions6.1 Vinyl siding and accessories will expand when heatedand c
23、ontract when cooled. If siding is installed in hot weatherand the siding is very warm it will be partially “expanded.”Provide allowance for more future “contraction” than expan-sion.6.2 Leave14 in. (6.4 mm) clearance between the ends ofpanels and trim and any receiver such as J-channels and cornerpo
24、sts to allow for thermal expansion. If installing duringweather colder than 40F (4.4C), increase the minimumclearance to38 in. (9.5 mm) to allow for additional expansionduring warmer weather.7. Materials7.1 Horizontal Wall SidingSee Specification D3679.7.2 Vertical Wall SidingSee Specification D3679
25、7.3 Sofft PanelsSee Specification D4477.7.4 Accessories:7.4.1 Starter StripFor horizontal siding made of poly(vi-nyl chloride) or corrosion-resistant metal.7.4.2 Corner PostsOf two types: for inside corners and foroutside corners of poly(vinyl chloride).7.4.3 Trim ChannelsProduced of poly(vinyl chlo
26、ride) in avariety of designs and sizes for use around openings and edgesof wall and soffit surfaces. (See Fig. 5.)7.5 Fasteners:7.5.1 NailsCorrosion-resistant with head diameter516 in.(7.9 mm) minimum, shank diameter18 in. (3.2 mm), lengthsufficient to penetrate not less than34 in. (19 mm) into fram
27、ingor furring.7.5.2 StaplesCorrosion-resistant, 16 gage minimum, with38 to12-in. (9.5 to 12.7-mm) crown, length sufficient topenetrate not less than34 in. (19 mm) into framing or furring.7.5.3 ScrewsCorrosion resistant, self-tapping type, No. 8truss head or pan head length sufficient to penetrate wa
28、llthickness of steel stud or34 in. into framing or furring.NOTE 2To minimize the possibility of any color variation use materialfrom a single manufacturers lot number for application to one building.8. Substrate, Surface Preparation8.1 Water-resistive BarrierVinyl siding must be installedover a wate
29、r-resistive barrier system that includes (1) acontinuous water-resistive material, and (2) properly integratedflashing around all penetrations and where vinyl siding inter-faces with other building products. Refer to the vinyl sidingmanufacturers installation instructions and the minimum re-quiremen
30、ts of the local building code for specific productapplications and requirements.8.2 All caulking to prevent moisture penetration must bedone before siding application. Do not use caulk where it couldrestrict the normal expansion of the vinyl siding.8.3 Apply vinyl siding over sheathing or other rigi
31、d surfacethat provides a smooth, flat surface. Do not apply vinyl sidingFIG. 3 Typical Siding ProfilesFIG. 4 Typical Soffit ProfilesD4756 153directly to studs without sheathing. If permitted by the vinylsiding manufacturer, a contoured foam underlayment fitted forthe specific style of vinyl siding i
32、s permitted to be utilized.Apply over wood furring strips when the underlying surface isuneven.8.4 Drive fasteners into framing or furring. Driving offasteners directly into sheathing or existing siding is permittedin accordance with the siding manufacturers instructions,where substantiated by windl
33、oad testing conducted in accor-dance with Specification D3679.8.5 On existing structures, secure any loose boards, replaceany rotted ones, recaulk around windows, doors, and otherareas as necessary to protect from moisture penetration prior tothe installation of siding or accessories. Use furring as
34、 neededto create an even surface.8.6 FlashingRefer to Practice E2112 for installation offlashing around windows, doors, penetrations and points ofinterface between the vinyl siding and other building compo-nents. If available, also refer to the instructions provided by themanufacturer of the window,
35、 door, or other object that willpenetrate the siding.8.7 FurringMasonry and uneven surfaces, as examples,require wood furring strips nominal 1 by 2 in. (25.4 by 50.8mm) applied vertically and typically spaced 16 in. (406 mm)on center for horizontal siding and applied horizontally andtypically spaced
36、 12 in. (305 mm) on center for vertical siding.9. Application of Horizontal Siding9.1 General RequirementsVinyl siding and accessoriesexpand and contract as much as12 in. (12.7 mm) over a 12 ft(3.65 m) length with changes in temperature. For this reasonadhere to the following provisions:9.1.1 When a
37、pplied, vinyl siding products must be attached“loosely,” leaving approximately a132-in. (0.8-mm) spacebetween the vinyl and the fastener head or crown to permitthermal movement. (See Fig. 6.)9.1.2 Center fasteners in slots of siding and accessories topermit possible expansion and contraction. (See F
38、ig. 7.) If anail slot does not allow centering/securing into framing,furring, or other permitted nailable surface, use a nail hole slotpunch to extend the slot and allow centering of the fastener.9.1.3 Do not face nail siding panels. (See Fig. 8.)9.1.4 Allow clearance at panel ends for thermal expan
39、sionbetween corner posts, J-channels, and other receivers inaccordance with 6.2.9.2 Installation of AccessoriesAccessories, includingstarter strips, corner posts and door/window trim, are installedprior to application of the siding, adhering to the provisions of9.1 and those which follow.9.2.1 Corne
40、r PostsOutside and inside corner posts willstart14 in. (6.4 mm) below the top, and end34 in. (19.1 mm)below the bottom edge of the first course of siding which willbe installed later. Attach each leg of the corner posts withfasteners, spaced not over 12 in (305 mm) apart centered innailing slots exc
41、ept the top fastener that is located at the upperend of a nailing slot.9.2.1.1 If more than one length of corner post is required,lap the upper piece over the lower piece by cutting away 1 in.(25.4 mm) of the nailing flange on the top piece. Lap34 in. (19mm) allowing14 in. (6.4 mm) for expansion. (S
42、ee Fig. 9.)9.2.1.2 As an alternative for inside corners, install twoJ-channels with the web of one abutting the adjacent wall andthe web of the other J-channel abutting the shorter outer flangeof the first J-channel. Attach as specified in 9.1.1.9.2.2 Starter StripDetermine the lowest point along th
43、earea to receive siding and install starter strips located so thatthe bottom edge of the initial course of siding will be on a levelline and typically approximately14 in. (6.4 mm) below thatpoint. Allow space for corner posts, J-channels, etc., and keepends of starter strips14 to12 in. (6.4 to 12.7
44、mm) apart. Spacefasteners not more than 10 in. (254 mm) apart, centered in nailslots.9.2.3 Door/Window Trim:9.2.3.1 Install flashing around windows and doors in accor-dance with 8.1 and 8.6 before installing trim.9.2.3.2 J-channel is installed on each side and the top ofdoor and window frames, and u
45、nder window sills. Alwaysinstall the bottom J-channel first, followed by the sidechannels, and then the top channel.9.2.3.3 Extend the bottom and top J-channel the length ofthe window frame plus the width of the visible face of the sideFIG. 5 Typical Siding AccessoriesFIG. 6 Attachment of Vinyl Sidi
46、ngD4756 154J-channels (typically34 in. (19 mm) on each side. Extend theside J-channels the height of the window or door frame plus thewidth of the visible face of the top and bottom J-channels.9.2.3.4 In the bottom J-channel, cut a notch in the web ateach end the width of the visible face of the sid
47、e J-channel. Inboth side J-channels, cut a notch at the top end and a tab at thebottom end. Miter the bottom ends of the visible face of theside J-channels at a 45 degree angle. In the top J-channel cutalong the bends at both ends of the J-channel to create a tab thesame length as the exposed face o
48、f the side J-channel. Miter theend of the visible face of both ends of the top J-channel at a 45degree angle.9.2.3.5 Install the bottom J-channel. Install each of the sideJ-channels, with the mitered visible face over the face of thebottom J-channel. Bend the tabs in the side J-channels into thebott
49、om J-channel. (See Fig. 10.)9.2.3.6 Install optional head flashing across the top of thewindow or door frame. Install the top J-channel with themitered face over the face of the side J-channels. Bend the tabsin the top J-channel into the side J-channels. (See Fig. 11.)9.3 Siding Panel Installation:9.3.1 General ConsiderationsTo make overlapped sidingjoints less noticeable on the sides of a building, start at the rearcorner and install toward the front. On the front and rear ofbuildings start at the corners
