Slide 35 of 45
- Provide Proper End Distance in the Sill Plate
- Additional anchors should be installed within 12 inches but not closer than 7 bolt diameters from the end of each sill plate piece.
- Provide Proper Depth of Embedment in the Concrete
- Both adhesive and mechanical anchors need a minimum depth of embedment in the concrete.
- The manufacturer’s recommendations will show the minimum embedment depths required.
- A good rule of thumb is:
4” into concrete for mechanical anchors
6” into concrete for adhesive anchors
- When holes are drilled deeper than required, nuts and plate washers should be installed on the mechanical and adhesive anchors before they pass through the sill plate.
- This will prevent anchor from sinking too deep into hole.
- If the anchor settles too deep in the hole, it should be left in place and another anchor installed nearby.
- When plate washers and nuts are countersunk into the sill plate, the reduced plate thickness weakens the connection
- Discussion of figure
- Shows installation of an epoxy anchor
- When dropped rod into hole, had not put washer on and rod want deeper than expected
- Instead of abandoning it, they dug it out
- The result is a 1”x 2” sill plate instead of a 2”x 2”
- Best: Cut bolt out