Holdowns

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Holdowns

PHD / DTB

Reference Series: HDU, DTT

PHD predeflected holdowns feature the pre-deflected base, minimizing deflection while providing uplift resistance. Installs with screws eliminating the need for predrilling and potential fastener slip. No thru bolts to countersink.

DTB-TZ is a light capacity holdown for single 2x installations.

Materials: PHDA & DTB models – 14 gauge; PHD8 – 12 gauge

Finish: G90 galvanizing; DTB-TZ – G-185 galvanizing

Code Reports: View Code Report Table

Options

DTB Corrosion Resistant Products Table

Technical Bulletins

High Wind Resistant Construction Guide

Installation

Use all specified fasteners.
Place the PHD over the anchor bolt, no washer is required. Washer is required on DTB installations.
Install with MiTek’s code evaluated WS15-EXT (1/4″ dia. x 1-1/2″ long) and WS3 (1/4″ dia. x 3″ long) structural wood screws, which are provided with the holdown.
Tighten anchor bolt nuts finger tight to base plus 1/3 to 1/2 additional turns with a wrench.
PHD Predeflected Holdowns may be installed off sill plate with no load reduction.
The design engineer may specify any alternate anchorage calculated to resist the tension load for a specific application. Anchorage exposure length should take the bearing plate height of 1-5/8″ into account, anchor bolt thread should visibly extend above nut.
If used to anchor a built-up post, such as a double 2 x 4, the post component shall be designed to act as a single unit. Holdown fasteners specified shall not be considered to attach multiple plies together.
For anchorage options see STB/STBL Anchor Bolt series Click here.