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, FASTENMASTER TECHNICAL BULLETIN
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CONNECTION DETAILS �
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The minimum fastening requirements for the rafter to top plate connection in the 2006/2009 International Residential
Code (Table R602.3) require 2-1 bd nails toenailed. The 2006/2009 International Building Code (Table 2304.9.1)
requires 3-8d nails toenailed. Both of these codes can be met by installing the FastenMaster TimberLok when the guide- ;
lines on this technical bulletin are followed. In many cases where increased wind uplift or seismic conditions require a
stronger rafter to top plate connection, this fastening method may also be used to replace metal ties and straps. i
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CAN BE USED WHEN RAFTER IS ALIGNED OVER OR BETWEEN WALL STUDS
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SIDE FasfenMasFer.
�'E'" TimberLok
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• Use a 6" FastenMaster Timberlok. • Drive fastener through double top plate at a 22'/z°ongle
• Where the rafter is directly over the wall stud, insert fastener point �+�—5°)and into the center of the rafter.
between the bottom of the top plate and the top of the stud. • Fastener must be driven into the center of the 1'/z"rafter edge
• Where the rafter is located between two studs, insert fastener point �+�—'�4��� With the threads fully embedded into the rofter.
on bottom surface of the top plate no greater than '/z"from the • Bring the fastener head flush with the wood surface.
inside edge of the plate. �
FastenMaster. Effective until January 1, 2010.Updated information must be obtained after this date.
FASTER EASIER STRONGER �53 BOWLES ROAD,AGAWAM,MA 01001 413•789•0252 800•518•3569 WWW.FASTENMASTER.COM
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FASTENMASTER TECHNICAL BULLETIN
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The FastenMaster Timberlok load values in Table 1 can TABLE 1
be used by a design professional to determine suitability
of these fasteners in a rafter to top plate connection. '
• Where the uplift and/or lateral design loads have
been provided on the building plons,the allowable yyood Species SPf/HF Douglas Fir Southern Pine
loads in Table 1 can be compared to the plan values
to make sure they are met or exceeded by use of this Lateral/ Lateral/ Lateral/
fastening method. Load Type Uplift Shear Uplift Shear UpIiR Shear
• If ties or strops have been colled for to resist uplift Aliowable Load 420 320 540 380 620 410
and lateral forces, the allowable loads in Toble 1
should be compared to the manufacturer's published • Timberlok values above are bosed on ICC-ES Report#1078 and independentiy verified
values for the specified connector to ensure that this �hrough testing to ASTM D-1761.
fasiening method meets or exceeds these loods. • A standard wind load duration factor has been applied to these values per NDS Table 2.3.2.
• In cases where the above iwo methods are not Other applicable NDS adjustment factors are at ihe discretion of a design professional.
available and the wind speed from IRC Figure • These values apply only to the top plate to rafter connection and ossume that the fastener is
301.2(4) equals or exceeds 100 mph in hurricane- properly installed per the inshuctions on this bulletin.
prone regions, or 110 mph elsewhere, the design
loads of this connection can be determined by a
design professional from one of the following three sources and compared to Table 1:
l. American Forest and Paper Association (AfBPA) Wood Frame Construction Manual for One-and Two-Family Dwellings (WFCM).
A sample of this chart is shown below.
2. International Code Council (ICq Standard for the Residential Construction in High Wind Regions (ICC-600).
3. Minimum Design loads for Buildings and Other Structures (ASCE-7).
Sample Wind Loads
Table 2 below represents common design wind loads on rafter to top plate connections taken from the AFBPA Wood Frame Construction Manual,
High Wind Zone Exposure B,Wall Connections at Load Bearing Walls.
TABLE 2
12 16 20 24 28 32 36
WIND
ZONE RAFTER LATERAL SHEAR
(MPH) SPACING � (LB.) (LB.)
90 16"o.c. 82 96 110 125 139 154 168 119 52
90 24"o.c. 123 144 165 187 209 230 252 178 78
100 16"o.c. 124 147 170 193 217 240 264 145 64
100 24"o.c. 186 220 255 290 325 360 396 218 96
110 16"o.c. 170 203 236 269 303 336 370 176 77
110 24"o.c. 255 304 354 404 454 504 554 264 116
120 16"o.c. 220 264 308 352 397 441 486 209 93
120 24"o.c. 331 396 462 528 595 bbl 728 314 140
130 16"o.c. 275 331 386 442 499 555 bl l 247 109
130 24"o.c. 413 496 580 664 748 833 917 370 164 g�
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This chart is used as an example only and should not be the sole source to design the connection. P W
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FastenMoster°'and Timberlok"are tmdemarks of OMG,Inc.
Copyright OO 2009 OMG,Int.All rights reserved.