Slide 32 of 45
LOCATING DRILLED-IN ANCHORS
- It is important to install anchors with the correct edge distance and to the appropriate depth
- The following discussion applies to both mechanical/ expansion anchors and to adhesive anchors.
- Provide Proper Edge Distance in the Concrete and Wood
- Drilled-in anchors require a minimum edge distance in concrete.
- If you center the anchor, you will be okay.
- The manufacturer’s recommendations will specify the minimum amount required for each diameter anchor.
- The figure shows an anchor that has failed due to insufficient edge distance in the concrete
- Anchors without sufficient edge distance will fail in earthquakes and sometimes, even during installation
- When obstructions require the hole be drilled at slight angle, make sure that the bottom of the hole still has the minimum edge distance. This is particularly important when using mechanical anchors.