Slide 42 of 45
Notes:
- Use All-threaded Rod
- These products chemically bond to concrete
- They will NOT chemically bond to the anchor rod (steel).
- You MUST use a threaded rod for all adhesive-anchoring systems. This allows the product to engage the threads and create a good mechanical bond to the rod.
- Smooth rods will pull out
- Completely Fill Hole in the Sill Plate with Adhesive
- Most adhesive products require holes in the concrete that are oversized 1/8-inch larger than the all-thread diameter rod.
- This creates oversized holes in wood sill plates because the limit is only 1/16-inch.
- To remedy this, enough adhesive should be placed in the hole to overflow the sill plate once the rod is installed, as we saw in the previous picture.
- This will allow the sill plate to immediately engage the anchor rod during an earthquake and allow it to transfer shear forces directly into the rod, thus reducing the chances of the sill plate splitting.
- Generally speaking, the hole should be filled approximately ¾ full of adhesive.
- Install the All-thread Rod with the Plate Washer and Nut Attached
- The washer and nut should be placed on the rod prior to installing the rod
- The adhesive extruding from the top of the sill plate will make it difficult to install the washer and nut at a later time.
- Since you won’t be hammering this in, the nut should be placed down the stem a little so that when it is tightened you have a full diameter of thread past the top.
- Wait Until Fully Cured Before Tightening
- Adhesive anchor installations will need to cure for several hours before they can be tested.
- Always check manufacturer’s requirements for minimum set and cure time. The time will vary depending on the product used and the temperature.
- Follow Safety Requirements
- A final word of caution on the use of adhesive anchors:
- You need to protect workers and the people living in the building from the fumes.
- Some smells terrible, some you can’t tell
- Check with the manufacturer to find out which product is appropriate for the use and what precautions, will be needed.
- You will learn more about this in the section on Safety & Legal.
