32C-248 truss drawingsRe:
The truss drawing(s) referenced below have been prepared by MiTek USA, Inc. under my direct supervision
based on the parameters provided by Western Mass Truss Co. Inc..
Liu, Xuegang
Pages or sheets covered by this seal: I28687050 thru I28687050
My license renewal date for the state of Massachusetts is June 30, 2018.
IS3434
Truss Engineer’s responsibility is solely for
design of individual trusses based upon design parameters shown
on referenced truss drawings. Parameters have not been verified
as appropriate for any use. Any location identification specified is
for file reference only and has not been used in preparing design.
Suitability of truss designs for any particular building is the
responsibility of the building designer, not the Truss Engineer,
per ANSI/TPI-1, Chapter 2.
IMPORTANT NOTE:
Scissor Truss
16023 Swingley Ridge Rd
Chesterfield, MO 63017
314-434-1200
MiTek USA, Inc.
January 5,2017
Job
IS3434
Truss
T-1
Truss Type
SCISSORS
Qty
4
Ply
1
Scissor Truss
Job Reference (optional)
I28687050
8.030 s Sep 29 2016 MiTek Industries, Inc. Thu Jan 05 11:06:55 2017 Page 1 WMT, WMA
ID:3xYOyQJ9JrH7PVotvDj51szyRdT-XewPjmJisfwmk47NPcrUn0QGyXSuWTw5ePc?r8zyQZE
Scale = 1:36.1
1
2
3
4
5
6
7
12
11
10
9
8
5x7
3x4
3x4
7x8
3x6
4x6
3x6
4x6
4x6 4x6
3-11-2
3-11-2
7-10-8
3-11-6
11-9-14
3-11-6
15-9-0
3-11-2
-1-0-0
1-0-0
3-11-2
3-11-2
7-10-8
3-11-6
11-9-14
3-11-6
15-9-0
3-11-2
16-9-0
1-0-0
1-0-05-7-21-0-03-8-87.00 12
6.00 12
Plate Offsets (X,Y)-- [2:0-2-14,0-2-0], [4:0-4-6,0-2-8], [6:0-2-14,0-2-0]
LOADING (psf)
TCLL
(Roof Snow=50.0)
TCDL
BCLL
BCDL
50.0
10.0
0.0 *
10.0
SPACING-
Plate Grip DOL
Lumber DOL
Rep Stress Incr
Code
2-0-0
1.15
1.15
YES
IRC2009/TPI2007
CSI.
TC
BC
WB
Matrix-R
0.58
0.78
0.66
DEFL.
Vert(LL)
Vert(TL)
Horz(TL)
Wind(LL)
in
-0.25
-0.40
0.46
0.07
(loc)
10
10
8
10
l/defl
>744
>462
n/a
>999
L/d
360
240
n/a
240
PLATES
MT20
Weight: 67 lb FT = 3%
GRIP
197/144
LUMBER-
TOP CHORD 2x4 SPF No.2
BOT CHORD 2x4 SPF No.2
WEBS 2x4 SPF No.2
BRACING-
TOP CHORD
Installation 1 Stabilizer(s) at 9-4-8 (max) oc, Except:
15-0-0 oc: 1-2.
Permanent Sheathed or 2-8-14 oc purlins, except end verticals.
BOT CHORD
Installation 1 Stabilizer(s) at 15-0-0 (max) oc.
Permanent Rigid ceiling directly applied or 10-0-0 oc bracing.
MiTek recommends that Stabilizers and required cross bracing
be installed during truss erection, in accordance with Stabilizer
Installation guide.
REACTIONS.(lb/size)12=1220/0-5-8, 8=1220/0-5-8
Max Uplift 12=-365(LC 4), 8=-365(LC 4)
FORCES.(lb) - Max. Comp./Max. Ten. - All forces 250 (lb) or less except when shown.
TOP CHORD 2-3=-2986/535, 3-4=-3279/331, 4-5=-3278/331, 5-6=-2986/535, 2-12=-1262/376,
6-8=-1262/376
BOT CHORD 11-12=-2/271, 10-11=-318/2775, 9-10=-318/2775, 8-9=-2/271
WEBS 4-10=-122/2674, 5-10=-35/586, 5-9=-511/128, 3-10=-35/586, 3-11=-511/128,
2-11=-286/2294, 6-9=-286/2294
NOTES-
1) Wind: ASCE 7-05; 110mph; TCDL=6.0psf; BCDL=6.0psf; h=25ft; Cat. II; Exp C; enclosed; C-C Exterior(2); cantilever left and right
exposed ; end vertical left and right exposed; Lumber DOL=1.33 plate grip DOL=1.33
2) TCLL: ASCE 7-05; Pf=50.0 psf (flat roof snow); Category II; Exp C; Partially Exp.; Ct=1.1
3) Unbalanced snow loads have been considered for this design.
4) This truss has been designed for greater of min roof live load of 16.0 psf or 1.00 times flat roof load of 50.0 psf on overhangs
non-concurrent with other live loads.
5) * This truss has been designed for a live load of 20.0psf on the bottom chord in all areas where a rectangle 3-6-0 tall by 1-0-0 wide
will fit between the bottom chord and any other members.
6) Bearing at joint(s) 12, 8 considers parallel to grain value using ANSI/TPI 1 angle to grain formula. Building designer should verify
capacity of bearing surface.
7) Provide mechanical connection (by others) of truss to bearing plate capable of withstanding 100 lb uplift at joint(s) except (jt=lb)
12=365, 8=365.
8) Where diaphragm blocking is required at pitch breaks, Stabilizers may be replaced with wood blocking.
9) Warning: Additional permanent and stability bracing for truss system (not part of this component design) is always required.
16023 Swingley Ridge Rd
Chesterfield, MO 63017
Design valid for use only with MiTekfi connectors. This design is based only upon parameters shown, and is for an individual building component, not
a truss system. Before use, the building designer must verify the applicability of design parameters and properly incorporate this design into the overall
building design. Bracing indicated is to prevent buckling of individual truss web and/or chord members only. Additional temporary and permanent bracing
is always required for stability and to prevent collapse with possible personal injury and property damage. For general guidance regarding the
fabrication, storage, delivery, erection and bracing of trusses and truss systems, see ANSI/TPI1 Quality Criteria, DSB-89 and BCSI Building Componentavailable from Truss Plate Institute, 218 N. Lee Street, Suite 312, Alexandria, VA 22314.Safety Information
WARNING - Verify design parameters and READ NOTES ON THIS AND INCLUDED MITEK REFERENCE PAGE MII-7473 rev. 10/03/2015 BEFORE USE.
January 5,2017
edge of truss.from outside"16/1-0PRODUCT CODE APPROVALSJOINTS ARE GENERALLY NUMBERED/LETTERED CLOCKWISEAROUND THE TRUSS STARTING AT THE JOINT FARTHEST TOTHE LEFT.CHORDS AND WEBS ARE IDENTIFIED BY END JOINTNUMBERS/LETTERS.W
4
-
6
W3-6W3-
7
W2-7W1-7C1-8
C5-6C6-7C7-8C4-5 C3-4C2-3C1-2TOP CHORD
TOP CHORD
87654321BOTTOM CHORDSTOP CHORDSBEARINGLATERAL BRACING LOCATIONIndicates location where bearings(supports) occur. Icons vary butreaction section indicates jointnumber where bearings occur.Min size shown is for crushing only.Indicated by symbol shown and/orby text in the bracing section of theoutput. Use T or I bracingif indicated.The first dimension is the plate width measured perpendicular to slots. Second dimension isthe length parallel to slots.4 x 4PLATE SIZEThis symbol indicates the required direction of slots inconnector plates."16/1For 4 x 2 orientation, locateplates 0- Center plate on joint unless x, yoffsets are indicated.Dimensions are in ft-in-sixteenths.Apply plates to both sides of trussand fully embed teeth.1"4/3PLATE LOCATION AND ORIENTATIONSymbolsNumbering System1. Additional stability bracing for truss system, e.g. diagonal or X-bracing, is always required. See BCSI.2. Truss bracing must be designed by an engineer. For wide truss spacing, individual lateral braces themselves may require bracing, or alternative Tor I bracing should be considered.3. Never exceed the design loading shown and never stack materials on inadequately braced trusses.4. Provide copies of this truss design to the building designer, erection supervisor, property owner and all other interested parties.5. Cut members to bear tightly against each other.6. Place plates on each face of truss at each joint and embed fully. Knots and wane at joint locations are regulated by ANSI/TPI 1.7. Design assumes trusses will be suitably protected from the environment in accord with ANSI/TPI 1.8. Unless otherwise noted, moisture content of lumber shall not exceed 19% at time of fabrication.9. Unless expressly noted, this design is not applicable for use with fire retardant, preservative treated, or green lumber.10. Camber is a non-structural consideration and is the responsibility of truss fabricator. General practice is to camber for dead load deflection.11. Plate type, size, orientation and location dimensions indicated are minimum plating requirements.12. Lumber used shall be of the species and size, and in all respects, equal to or better than that specified.13. Top chords must be sheathed or purlins provided at spacing indicated on design.14. Bottom chords require lateral bracing at 10 ft. spacing, or less, if no ceiling is installed, unless otherwise noted.15. Connections not shown are the responsibility of others.16. Do not cut or alter truss member or plate without prior approval of an engineer.17. Install and load vertically unless indicated otherwise.18. Use of green or treated lumber may pose unacceptable environmental, health or performance risks. Consult with project engineer before use.19. Review all portions of this design (front, back, words and pictures) before use. Reviewing pictures alone is not sufficient.20. Design assumes manufacture in accordance with ANSI/TPI 1 Quality Criteria.Failure to Follow Could Cause PropertyDamage or Personal InjuryGeneral Safety Notes*Plate location details available in MiTek 20/20software or upon request.Industry Standards:6-4-8dimensions shown in ft-in-sixteenths (Drawings not to scale)' 2012 MiTekfi All Rights ReservedMiTek Engineering Reference Sheet: MII-7473 rev. 10/03/2015WEBSedge of truss.from outside"16/1-0ICC-ES Reports:ESR-1311, ESR-1352, ESR1988ER-3907, ESR-2362, ESR-1397, ESR-3282JOINTS ARE GENERALLY NUMBERED/LETTERED CLOCKWISEAROUND THE TRUSS STARTING AT THE JOINT FARTHEST TOTHE LEFT.CHORDS AND WEBS ARE IDENTIFIED BY END JOINTNUMBERS/LETTERS.W
4
-
6
W3-6W3-
7
W2-7W1-7C1-8
C5-6C6-7C7-8C4-5 C3-4C2-3C1-2TOP CHORD
TOP CHORD
87654321BOTTOM CHORDSTOP CHORDSBEARINGIndicates location where bearings(supports) occur. Icons vary butreaction section indicates jointnumber where bearings occur.4 x 4PLATE SIZEThis symbol indicates the required direction of slots inconnector plates."16/1For 4 x 2 orientation, locateplates 0- 1"4/3PLATE LOCATION AND ORIENTATIONSymbolsNumbering SystemGeneral Safety Notes*Plate location details available in MiTek 20/20software or upon request.Industry Standards:ANSI/TPI1: National Design Specification for Metal Plate Connected Wood Truss Construction.DSB-89: Design Standard for Bracing.BCSI: Building Component Safety Information, Guide to Good Practice for Handling, Installing & Bracing of Metal Plate Connected Wood Trusses.6-4-8dimensions shown in ft-in-sixteenthsWEBSTrusses are designed for wind loads in the plane of the truss unless otherwise shown.Lumber design values are in accordance with ANSI/TPI 1 section 6.3 These truss designs rely on lumber values established by others.