DETAL Dual Embedded Truss Anchor
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Girder Tiedowns for Masonry
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The DETAL provides an engineered method to attach single-ply trusses securely to concrete and masonry walls. This high-capacity embedded truss anchor combines dual embedded anchors with a structural moisture-barrier seat that serves to protect the truss and also provide additional lateral and uplift capacity. The embedded anchors of the DETAL are preattached to the moisture barrier through slots that allow some adjustment during installation to avoid rebar.
- Tabs at each end of moisture-barrier seat, for optional attachment to the form board in concrete tie-beam applications
- Moisture-barrier seat is partially embedded in the concrete or grout
- The strap can be installed straight or field-bent around truss or rafter members
- Load rated for wind and seismic forces
- 16 gauge (barrier — 18 gauge)
- Use all specified fasteners; see General Notes.
- Embedded 4 1/2".
- Installed centered and flush on top of an 8" masonry bond beam or concrete tie beam. The moisture-barrier seat bears on masonry face shell or concrete tie beam form boards; the two flanges embed into grout or concrete. The two embedded anchors shall be installed vertically into grout or concrete.
- For mislocated truss anchors which are greater than 1/8" but less than 1 1/2" from the face of the truss, a shim must be provided. Shim design by truss engineer. When gap is greater than 1 1/2", abandon existing embedded truss anchor and install new anchor per designer.
- Minimum spacing between the anchors to achieve full load is twice the embedment.
- In double anchor installations, install anchors with spoons facing outward and straps spaced no more than 1/8" wider than the rafter/truss width. Do not install nails where the straps overlap when wrapped over the rafter/truss.
- For lateral loads listed, the lowest four nail holes must be filled.
- Straps do not need to be wrapped over the rafter/truss to achieve tabulated loads, unless noted otherwise.
Product Information Table
|Model No.||Ga.||H (in.)||Coating/Material||Packaging Qty.|
|DETAL20||16; barrier 18||15 3/4||Zinc Galvanized, G90||1|
- Loads have been increased for wind or earthquake loading, with no further increase allowed. Reduce where other loads govern.
- Concrete shall have a minimum compressive strength of f'c = 2,500 psi.
- Grout-filled CMU (GFCMU) shall have a minimum compressive strength of f'm = 1,500 psi.
- For simultaneous loads in more than one direction, the connector must be evaluated using either the Unity Equation or the 75% Rule, as described in Straps and Ties General Notes.
- The DETAL20 requires six nails installed in the truss seat and six nails in each strap.
- It is acceptable to use a reduced number of fasteners provided that there is a reduction in uplift allowable load. Calculate the connector allowable load for a reduced number of nails as follows: Allowable Load = (No. of Nails Used) / (No. of Nails in Table) x Table Load.
- Fasteners: Nail dimensions in the table are listed diameter by length. For additional information, see Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors.
Code Reports & Compliance