Floor Truss Guide - alpineitw.com

1 Wood Floor Trusses areEnvironmentally TRUSSESGet more Quality, Flexibility and Labor Savings usingGet more Quality, Flexibility and Labor Savings usingBuilders want solutions that help them stay on schedule and maintain quality construction and profits. Whencompared to traditional joist construction, manufactured wood Floor Truss systems are better, stronger, and can beinstalled faster. A manufactured Truss is an engineered structural component assembled from wood members,metal connector plates and other mechanical fasteners. The Truss members form a rigid structural framework andare assembled such that the members form triangles. Most builders are familiar with roof Truss systems, but maynot realize the advantages of a manufactured Floor Truss benefits of manufactured wood Truss Floor systems are many. Floor trusses can span great distances, creatinglarger open spaces below unobstructed columns and partitions. Truss systems are quicker and easier to installthan traditional Floor joists, and because they're manufactured in controlled environments, there's less chance ofwarping, shrinking, and twisting of lumber.

2 Manufactured Floor Truss systems also save timber resources byreducing the amount of wood waste generated during TRUSSESGet more Quality, Flexibility and Labor Savings usingGet more Quality, Flexibility and Labor Savings usingThe component manufacturing process is simple and offers the professional builder plenty of time- and cost-saving resources along the way. Here's how it works:House plans are sent by the builder to the wood Floor Truss manufacturer. There are hundreds of trussmanufacturers operating nationwide, but builders should research the quality and delivery costs before choosing building designer determines what loads need to be supported by the Floor trusses. Then the Truss designerdetermines how many trusses will be required, and their specific placement on the structure. The manufacturerthen builds the trusses, labels them for accurate installation, and ships them to the builder on the detailed diagram with the placements of the trusses is sent along with the order to help the builder place thetrusses exactly where they should be the trusses are on the site, the builder can really start to see the benefits.

3 The consistent size and height of themanufactured Floor joist will mean easier sub- Floor material installation, and the open web design allows for utilitiesto be run through in the Floor system without drilling or cutting holes. These benefits will reduce the amount of timetrade contractors spend on site, speed up construction, and ultimately save the builder money. The technologyused in the design and manufacturing of Floor trusses makes them a superior choice for builders looking tostreamline construction and provide a higher quality home to their 12 12 6 7 6 Floor trusses are delivered to your site, ready forinstallation. No cutting or fitting is required. Strong,lightweight and rigid System 42 Floor Trusses goup easily and quickly. Often without the use of acrane. Expensive steelworkers, welders or riggersare not required. Your crew can do it and ceiling materials are attached directlyto trusses without need for special hardware.

4 Andbecause System 42 trusses can be spaced wider apart,less trusses are required resulting in less nails to are installed quickly through the open webs withoutnotching or furring. Electricians, A/C contractors and plumbers are off thejob 42 provides longer clear spans providing exceptional design flexibility. Forthis reason, plus their cost saving benefits during construction, more and morearchitects are specifying System 42 Floor Trusses than ever TRUSSESThe Benefits ofThe Benefits ofFloor Truss are built with open chases for ductwork and have natural open spaces for plumbing and electrical Truss systems are sometimes called System 42's, because to build them manufacturers turn the 2x4's on theirside. This allows for shallow depths as well as a 3 1/2" nailing surface. Some floors are built from 2x3's, others from2x4's. Floor trusses can be manufactured with many different possible end conditions to accommodate differentinstallation needs; around raised walls, pocketed beams, headers around stairways, it OK to move a Floor Truss ?

5 Typical Floor trusses are engineered to be spaced evenly, and the Truss designdrawing verifies the required Truss spacing. Occasionally the need will arise to shift one of the Floor trusses fromwhere it was designed to be. When this happens, please contact the Truss manufacturer to be sure it works. Slidinga Floor Truss even a few inches puts more load on the Truss you're moving it away from, as shown in the with the Truss manufacturer before shifting a Truss !BIf you shift itThen overstressed Truss carries::24"3" more load than designed for27"on center6" ""trusses9" ""16"3" more load than designed for19"on center6" ""Fan Configuration Web StyleTwo of the most common web patterns for Floor trusses:Warren Configuration Web TRUSSESF raming withFraming withDouble trussHeaderMultiple ply Floor trussesmay require special con-nection details betweenplys. Specialconnectors will bespecified on parallel totrusses in Floor systemsdo not present a means of enclosed headersand beams or girders theseconditions can be handled with easeas stairwell openings perpendicular to floortrusses, additional posts or bearing wallsmay be required.

6 All loads from stairs andsurrounding walls must be considered forcorrect Floor Truss may be supported as top chordbearing or by hanger. Headers may besupported by a chord bearing on a stud with an exterior wall on the chord bearing with shortcantilever and exterior chord bearing on stud Truss designed to carry an interior bearing on wallOverhang on a Floor Truss used on a cantilever foruse on exterior end conditionwith I-Joist top chord bearing witha variable end chord bearing witha variable end chord bearing on stud wallwith variable end 3 17 32 These allowable spans are based on NDS deflection is limited by L/360 or L/480 under1live load. Basic Lumber Design Values are F =2000 psi(b)F =1100 psi F =2000 psi E=1,800,000 psi Duration(t)(c)Of Load = Spacing of trusses are center-to-center(in inches).Top Chord Dead Load = 10 psf. Bottom Chord DeadLoad = 5 psf. Center Line Chase = 24" max. Trussesmust be designed for any special loading, such asconcentrated loads.

7 Other Floor and roof loadingconditions and a variety of species and other lumbergrades are DepthTruss DepthSpacingLimit12"14"16"18"20"22"12"14 "16"18"20"22"16" '2"24'11" 26'10"28'8"30'4"31'11"19'0"20'9"22'4"23' 10"25'3"26'7"L/48020'2"22'7"24'11"27'2"2 9'4"31'5"18'0"20'2"22"4'23'10"25'3"26'7" " '9"22'8"24'4"26'0"27'6"29'0"17'3"18'9"20 '3"21'7"22'10" 24'1"L/48018'11"21'3"23'6"25'7"27'6"29'0 "16'11"18'9"20'3"21'7"22'10" 24'1"24" '5"20'1"21'7"23'1"24'5"25'9"15'2"16'7"17 '10"19'1"20'2"21'3"L/48017'7"19'9"21'7"2 3'1"24'5"25'9"15'2"16'7"17'10"19'1"20'2" 21'3"12"14"16"18"20"22"12"14"16"18"20"22 "16" '4"21'4"23'0"24'6"26'0"27'4"16'3"17'9"19 '2"20'5"21'8"22'9"L/48017'7"19'9"21'10"2 3'9"25'8"27'4"15'9"17'8"19'2"20'5"21'8"2 2'9" " '9"19'4"20'10"22'3"23'7"24'10"14'9"16'1" 17'4"18'6"19'7"20'7"L/48016'7"18'7"20'6" 22'3"23'7"24'10"14'9"16'1"17'4"18'6"19'7 "20'7"24" '9"17'2"18'6"19'9"20'11"22'0"13'0"14'2"1 5'3"16'4"17'3"18'2"L/48015'4"17'2"18'6"1 9'9"20'11"22'0"13'0"14'2"15'3"16'4"17'3" 18'2"12"14"16"18"20"22"12"14"16"18"20"22 "16" '11"18'6"19'11"21'3"22'6"23'8"14'1"15'5" 16'7"17'8"18'9"19'9"L/48015'8"17'7"19'5" 21'2"22'6"23'8"14'0"15'5"16'7"17'8"18'9" 19'9" " '4"16'9"18'1"19'3"20'5"21'6"12'9"13'11"1 5'0"16'0"16'11" 17'10"L/48014'9"16'6"18'1"19'3"20'5"21'6 "12'9"13'11"15'0"16'0"16'11" 17'10"24" '8"14'10"16'0"17'1"18'1"19'1"11'3"12'3"1 3'3"14'1"14'11"15'9"L/48013'8"14'10"16'0 "17'1"18'1"19'1"11'3"12'3"13'3"14'1"14'1 1"15'9"(1) Vibration Control -- Research by Virginia Tech indicates thatL/480 live load deflection criteria provides a high degree ofresistance to Floor vibration (bounce).

8 The building designerdesiring this benefit may choose to specify an L/480 live loaddeflection criteria to be used for the Floor PSF Live Load55 PSF Total Load85 PSF Live Load100 PSF Total Load60 PSF Live Load75 PSF Total Load40 PSF Live Load55 PSF Total Load85 PSF Live Load100 PSF Total Load60 PSF Live Load75 PSF Total Load4x2 Lumber3x2 Lumber3/"122/"121/"121/"12 Floor TRUSSESSpan Tables forSpan Tables 3 12 6 22 3 Duct Openings For Fan Style Floor Trusses With 4x2 Chords & WebsAll Dimensions In InchesDepthPanelSizeABCDEFG106041/241/41 141/21647116051/451/41251/21558117/86073 /463/41061/41451/283/4126061/461/4146205 9136071/471/4127181/2610146081/481/41772 2611156091/481/2158256121660101/491/2149 276131860121/4101/2141/2101/226715206014 111/2141/21226817226016121/2151330819246 018131/2161432821266019141/2181534823306 022162017321024366025171/222191/2361024 Typical Duct Opening Sizes For 4x2 Fan Style Floor TrussesAll Dimensions In InchesDuct Openings For Warren Style Low JoistsDepthBACDEF10121314151617181920212 2241820202424242424242424242424303030303 0303030303030304x65x95x116x106x126x136x1 47x137x147x158x148x158x1657881/291/21010 1/211111/212121/2131441/253/4661/2771/27 1/2883/481/29991/47910111213141516171819 21 Floor TRUSSESF raming withFraming TRUSSEST ypical Bearing / Heel Conditions forTypical Bearing / Heel Conditions forCommon complaints about noise through ceilings in floortrusses include walking, moving furniture, and droppingobjects, all of which are considered impact sounds.

9 Whenaddressing noise in Floor systems, the Impact InsulationClass (IIC) rating is often the most critical value to general, IIC values for flooring are similar to their SoundTransmission Class (STS) values, so satisfying the coderequirement for one will typically work for the other, if notcome Floor /ceiling's ability to limit sound transmission is not highlydependent on the type of joist or Truss to be used, but ratherthe types of insulation, sheathing, flooring, and basic Floor /ceiling construction materials like gypsumboard and hard surface flooring don't provide much IIC best methods for reducing impact noise, besides substantially increasing the Floor systems mass, is to usespecialized acoustic products such as resilient channels and special acoustic underlayment's, as identified of these measures are effective at reducing only certain types of noise and work in combination with theother measures to create a complete soundproofing system.

10 Batt insulation, for example, is effective forabsorbing airborne sounds, but does little or no good against structural/impact noise. While carpeting with afairly thick layer of padding beneath it is excellent at reducing impact noise, it is not effective against airbornenoise. For additional information regarding Sound Transmission in Wood Floor and Roof Trusses, refer toSBCA report:.SRR No. 1601-03 Bracing is extremely IMPORTANT!!Every Truss system needs adequate bracing. The purpose of most bracingis to ensure that the trusses and Truss members remain straight and do not bow out of their plane. Inadequate,improper or incorrectly installed bracing can lead to collapses, failures and serious accidents. An engineeredbracing system will avoid these pitfalls and ensure the structural integrity of the Truss system. Trusses need to bebraced during installation, which is called temporary bracing and they need permanent bracing which will remaininstalled for the life of the roof Bracing Guidelines:For metal plate connected wood Truss systems, refer to BCSI-B7 for properinstallation bracing provider of this document, nor any of its divisions or companies, does not warrant the recommendations and information contained herein as proper under all conditions andexpressly disclaims any responsibility for damages arising from the use, application, or reliance on the recommendations contained Transmission through Floor Trusses7 Powerful CAD-based design softwarefrom Alpine generates traditional planview layouts, and 3-D graphics that givean accurate picture of a structure fromvirtually any perspective by showing everycomponent in place.