Intro: Trick for Attaching Sill Plates to Concrete Footings
Attaching sill plates to continuous footings on the first try can be a challenge.
Traditionally, contractors will lay the sill plate on top of the anchors and bash it with a hammer to mark the location of the anchor bolts. Typically the board will move between hammer blows, and you never end up with a clean mark on the sill plate. Also, the anchor bolts will be slightly out of level, so only the tallest anchors make a mark.
This trick will help you precisely mark the location of anchor bolts in sill plates.
All you need (on top of the anchor bolts, washers and nuts) is two things:
- some small sections of pipe (1/2 copper couplings fit perfectly over a standard 5/8" anchor bolt)
Step 1: Prepare the Tallest Anchors
Ok, so you'll need to balance the sill plate on the tallest anchors to start...
- Measure them all with a tape measure and pick the two or three tallest ones.
- Thread on a nut, and then put a square washer
- Adjust the nut so that the washer makes a nice little platform to balance the sill plate
- Rub some chalk onto the top of the anchor bolt
Step 2: Prepare the Short Anchors
So, the short anchors will need some special treatment to mark the board...
- Thread a nut onto the anchor
- Rub some chalk onto the rim of one of our pipe couplings
- Put the coupling over the anchor so it rests on the nut with the chalk side facing up
- The coupling should sit just below the top of the anchor bolt (for now)
Step 3: Align and Mark the Sill Plate
Now, we'll need to mark the underside of the sill plate...
- Align the sill plate with the footing, balanced on top of the tall anchor platforms.
- Adjust the nut on the short anchors so that the coupling comes into contact with underside of the sill plate
- Hold the board in place and gently tap the board above each anchor with a hammer (becareful not to move the sill plate!)
- With chalk, outline the square washers on the tall anchor bolts (just in case we didn't get a good mark from the tapping.)
You should now have some really nice marks where the anchor bolts need to be!D
Step 4: Drill, Baby, Drill!
Now just drill right on the marks we've made. ..
- Over-drill the holes slightly. 11/16" bit for 5/8" anchors
- You can now flip the sill plate over and with a hammer, bash it onto the anchors. (it should go without too much of a fight)
- Tighten the nuts over the square washers