With nearly 60 years of field and R&D experience, Simpson Strong-Tie ® timber connectors are manufactured to the industry's highest standards. Unmatched Quality from the Truss to the Foundation Submit registration Structural Connections See Fastening Systems for more information on Simpson Strong-Tie fasteners.The adjusted allowable load is then 550 lb. For example: 43 mil (18 ga.) truss member with a yield strength, Fy, of 33 ksi and a tensile strength, Fu, of 45 ksi is connected to 43 mil top track and wall stud. Reduce tabulated load proportionally for lower truss member steel strength. Tabulated loads based on truss members with yield strength, Fy, of 50 ksi and tensile strength, Fu, of 65 ksi.For parts installed on the outside of wall where only three plate fasteners can be accessed, reduce table loads by 0.75 for single part and 0.875 for two-part installations.Installation on the inside of wall is acceptable with detailing for the uplift continuous load path by Designer. H1.81Z shown on the outside of wall assumes a min.When cross-grain tension cannot be avoided in the members, mechanical reinforcement to resist such forces may be considered.Allowable loads in the F 1 direction are not intended to replace diaphragm boundary members or cross-grain bending of the truss or rafter members.Timber species for joint design is seasoned Radiata Pine, which is Australia Joint Group JD4 per AS 1720.1 Table H2.4.Reduce Duration of Load Factor (k 1) where applicable. Duration of Load Factor (k 1) is as shown.For New Zealand, The Capacity Factor ( φ) is 0.8 for nails. Reduce tabulated values where other Category applications govern. For Australia, the Capacity Factor ( φ) is 0.85 for nails and screws for structural joints in a Category 1 application.Design Capacity is the minimum of test data and structural joint calculation. Design Capacity is the lesser of (1) the Characteristic Capacity multiplied by the Australian Capacity Factor, or the NZ Strength Reduction Factor ( φ), and applicable the k modification factors following AS 1720.1 and NZS 3603 and (2) the Serviceability Capacity which is the load at 3.2mm joint slip.Hurricane ties do not replace solid blocking.

Ties can be installed with flanges facing inward or outward.Simpson Strong-Tie Stainless Steel connectors require stainless steel fasteners.Install with Simpson Strong-Tie 8d common nails or Strong-Drive SD screws.H2.5A is available in 316 Stainless Steel for extra corrosion protection.May be used for general tie purposes, strongback attachments, and as all-purpose ties where one member crosses another.Install in pairs on either side of the rafter/truss/joist to provide resistance to uplift and lateral forces.Engineered swages for extra strength and to minimise deflections.H1.81 has a wider seat to fit 45 mm structural timber framing.Provides a secure hold to help weather storms.Please check Corrosion Information if it is suitable for your application. It is available in galvanised and stainless steel for extra corrosion protection. The H2.5A connects the truss/rafter to the top plate and is also suitable for joist to bearer connections. The H1.81Z installs with half the nails that are needed for two single-sided twist straps (like the H2.5A) and offers a higher lateral allowable load, making it a cost effective and higher-performing solution to tie down a rafter roof.

It also suits for bearer to joist connection in flooring and deck framing applications. It's ideal for connections when there are higher-load demands on the structure, like a heavy snow load, and provides lateral resistance in a seismic event. The H1.81Z Hurricane Tie is designed for use with 45mm structural timber framing to provide a stronger connection between the top plate of the wall and rafter. Some hurricane tie models are available with additional corrosion resistance for exterior and treated-timber applications.

These ties connect both solid-sawn and engineered timber across a wide range of applications. Hurricane Ties provide a positive connection between the truss/rafter and the wall of the structure to resist wind and seismic forces.

Roof rafter tie