Download the General Instructions for the Installer for your drawings.
These general instructions for the installer are provided to ensure proper selection and installation of Simpson Strong-Tie Company Inc. products and must be followed carefully. These general instructions are in addition to the specific installation instructions and notes provided for each particular product, all of which should be consulted prior to and during installation of Simpson Strong-Tie Company Inc. products.
Top flange configuration and thickness of top flange need to be considered for flush frame conditions.
If the hanger is over-spread, it can raise the I-joist above the header and may cause uneven surfaces and squeaky floors. The ITS and IUS with up to 1⁄4" overspread (both sides combined) will not result in reduced download. It will reduce allowable uplift load.
A hanger “kicked-out” from the header can cause uneven surfaces and squeaky floors.
Hangers provide some joist rotation resistance; however, additional lateral restraint may be required for deep joists.
Lack of web stiffeners combined with short hanger allows unwanted rotation.
Hanger height should be at least 60% of the joist height.
If hanger height is less than 60% of the joist height, add clips or blocking near the top.
Sides of hanger laterally support the top flange of the I-joist.
No web stiffeners required.
The loading may cause cross-grain bending. As a general rule, the maximum allowable overhang is 1⁄4", depending on nailer thickness.
Nailer should be full width.
Or the wrong hanger for the application.
Toe nailing causes squeaks and improper hanger installations. Do not toe nail I-joists before installing top-flange or face-mount hangers.
For sloped joists up to 1⁄4:12 there is no reduction. For slopes greater than 1⁄4:12 see individual product pages or refer to technical bulletin T-C-SLOPEJST.
Multiple joists should be adequately connected together to act as one unit.
Use the correct nails. Wood may split if the nails are too large. Hanger nails into flanges should not exceed 0.148" x 1 1/2". Nails into web stiffeners should not exceed 0.162" diameter.
Supporting a top flange hanger may require bottom flange restraining straps, blocking or directly-applied ceiling systems to prevent rotation at the hanger location.
Joists may be skewed up to 2 1/2° in a non-skewed hanger without any load reduction. Refer to individual hanger descriptions for information allowing any further skew applications.
Notching of joists/rafters to accommodate sloped conditions in standard (non- sloped) hangers is not recommended and can lead to premature splitting.
When face-mount hangers are attached to I-joist headers, backer blocks must be installed to provide a nailing surface for the hanger nails. The backer blocks should be installed on both sides of the web and attached together with a minimum of (10) 0.148" x 3" nails. The hanger nails should extend through the web. Contact the I-Joist manufacturer for additional design considerations.
When top-flange hangers are attached to I-joist headers, a backer block must be installed to prevent the top flange from rotating under load. The backer blocks should be installed with a minimum of (10) 0.148" x 3" nails clinched. Check with the joist manufacturer for additional design considerations.