Pryda Connectors GuideFixing Timber Trusses to Steel Framing

Copyright: (c) Pryda AustraliaA Division of ITW Australia

November 2009

November 2009

CONNECTORS GUIDEFixing timber trusses to steel framingCopyright: © Pryda Australia - A Division of ITW Australia – ABN 63 004 235 063 – November 2009

PRYDA CONNECTORS GUIDE – Fixing Timber Trusses to Steel Framing- November 20092

Pryda Connectors GuideFixing Timber Trusses to Steel Framing

INDEX

General NotesGeneral Information and Definitions 3

Triple GripsFraming anchors to tie-down trusses and rafters (light wind)

4

Cyclone StrapsStraps to tie-down trusses and rafters (high wind)

5

Product Information Updatescontained in this product guide is

subject to change.

The latest updates are available fromwww.pryda.com.au.

CONNECTORS GUIDEFixing timber trusses to steel framingCopyright: © Pryda Australia - A Division of ITW Australia – ABN 63 004 235 063 – November 2009

PRYDA CONNECTORS GUIDE – Fixing Timber Trusses to Steel Framing- November 2009 3

GENERAL NOTES

Material ThicknessAll material thicknesses referred to in this guide are the total coated thickness. This includes the zinc coatingthickness, which is typically around 0.04mm for Z275 steel or 0.05mm for AZ150 steel.

Fastener SpecificationsFixing into Steel: The design capacities for fixing into steel in this guide are given for two screw gauges, 10g or12g screws as applicable.

10g screws refers to Buildex 10-16x16 Teks® screws using a nominal screw diameter (df) of 4.9 mm. 12g screws refers to Buildex 12-14x20 Teks® screws using a nominal screw diameter (df) of 5.4 mm.

Metal self drilling screws from other suppliers, having similar or better specifications, may be used in lieu of theabove mentioned screws. The screw head can be either hex-head, wafer-head, flat top head or similar.

For further information on metal self drilling screws, visit ITW Buildex website at www.buildex.com.au

Fixing into Timber: Fasteners used in this guide for fixing into timber are typically 35 x 3.15 dia Pryda Connectornails or No.12x35 Type 17 screws (Pryda product code: WTF12-35)

End Distance, Edge Distance and Spacing requirement for screws

Table 1 – Minimum End Distance Requirements for Pryda Connectors

Design StandardsThe Design Uplift Capacities given in this guide include the appropriate Capacity Factors (). They have beencalculated in accordance with AS/NZS 4600:2005 (steel screws in shear) and AS1720:1997 (lateral capacitiesof nails or screws into timber). The steel capacities of the connectors have been established from test.

DurabilityPryda products having Z275 coating is suitable for most internal applications. Refer BCA for information on theextent of its suitability. A Class 3 screw is normally recommended for fixing into Z275 or AZ150 steel. Visit ITWBuildex website for further information on corrosion requirement on screws.

e1 p1

e2

e2

p2

Min.edge distance (e2) = 1.5df (8mm for 10g & 9mm for 12g screws)Min. end distance (e1) = See Table below

Min. spacing (p1 or p2) = 3.0df (15mm for 10g & 17mm for 12g screws)

The Table below gives the minimum end distance that is required to avoidplate tear-out for a typical 1.00mm G300 connector (eg:Triple Grips,Cyclone straps etc) while maintaining the full capacity of the screw in shear.

Notes:(a) The end distance is the distanceto edge of steel measured in thedirection of the applied force.

(b)The end distances with ‘*’ is theminimum end distance of 1.5df forthe respective screw.

(c) Pryda connectors use G300 Z275steel.

CONNECTORS GUIDEFixing timber trusses to steel framingCopyright: © Pryda Australia - A Division of ITW Australia – ABN 63 004 235 063 – November 2009

PRYDA CONNECTORS GUIDE – Fixing Timber Trusses to Steel Framing- November 20094

TRIPLE GRIPSPryda Triple Grips are typically used to tie-down roof trusses or rafters.

SpecificationSteel 1.0 mm G300- Z275

ProductCodes

TGAR, TGALMPTGAR,MPTGAL

Note: Product codes are: TG + Profile + R = Right handor L = Left Hand, “MP” = Merchant pack – individuallybarcoded product

ProfilesNote:Profilesshown areRight hand

Dimensions

Packing 100 per carton, 50 per carton (merchant packs)

Design Capacities for a Single Triple GripNote: The capacities given in the table below may be multiplied by 2 when two Triple Grips are used.

(i) Using 4 screws on steel wall plate and 3/No.12x35 Type 17 screws (1) on timber truss/rafter

(ii) Using 5 screws on steel wall plate and 3/No.12x35 Type 17 screws (1) on timber truss/rafter

Note:(1) Fixing into timber with 4 nails: When triple grips are fixed with 4 nails in place of 3/No.12x35 Type 17 screws, the abovecapacities should be limited to a maximum 3.2 kN (for JD5 timber), 3.8 kN (JD4) and 5.3 kN (JD3)(2)All screws should be installed with a minimum edge/ end distance and spacing requirement given in page 3 (General Notes)

AR AL

60

73

11540

2 SCREWS

2 SCREWS

3SCREWS

2 SCREWS

4 Screw Connection

5 Screw Connection

3 SCREWS OR4 NAILS

3 SCREWS OR4 NAILS

CONNECTORS GUIDEFixing timber trusses to steel framingCopyright: © Pryda Australia - A Division of ITW Australia – ABN 63 004 235 063 – November 2009

PRYDA CONNECTORS GUIDE – Fixing Timber Trusses to Steel Framing - November 2009 5

CYCLONE STRAPSPryda Cyclone Straps are typically used in cyclonic areas for tying down roof trusses or other roof members to thewall frame. They can also be used to fix purlins to roof trusses.

Specification

Size See Dimensions on the rightSteel G300-Z275 Galvanised steel

Product CodeQHS4

QHS4/2*QHS6

QHS6/2* QHS9

Thickness (mm) 1.0 or 1.2* 1.0 or 1.2* 1.0Packing 80/carton 80/carton 25/bundle

Length 400 mm 588 mm 880 mm

Design Capacities for a Single Cyclone StrapNote: The capacities given in the table below may be multiplied by 2 when a pair of Cyclone Straps are used. Thewall plate is assumed to be adequate in its own right, to resist design loads.

(i) Using 2/12g screws on wall plate per leg

(ii) Using 3/12g screws on wall plate per leg

Note: All screws should be installed with a minimum edge/ end distance and spacing requirement given in page 3 (GeneralNotes) There is no requirement for the screws to be driven through holes (the holes in the cyclone straps are located to satisfyedge distance requirements for 3.15 dia nails)

2 SCREWS ON WALLPLATE PER LEG

3 SCREWS ON WALLPLATE PER LEG

2 NAILS