These are the general rules of thumb for locating safety tieback anchors - as per the ANSI / IWCA I-14.1-2001 - and per generally accepted best practices and common sense ... (click title for more)
- Never closer than 6' from unprotected roof edge or insufficient parapet wall or from a leading edge with a drop of 6' or more
- Never more than 50' from the roof edge
- No more than 12' apart
- No closer than 6' apart
- Placed inline with the work, that is, so that the suspension line intersects the roof edge perpendicular, or, no more than 15 degrees off perpendicular
- Ultimate load strength must be 5,000 lbs. (5,400 in CA)
- The building attachment point must be able to handle the ultimate load