Secure Pressure Treated Wood to Concrete
1. I first marked the wood where I wanted my bolts to go. I tried to make the bolt pattern uniform, and close to the ends of the boards so the boards would lay flat against the concrete..
2. I drilled 1/2" holes through the pressure treated wood where the marked hole patterns were. I then laid the boards into position (I measured from the side of the house to one side of the boards on both ends, I wanted the area of the walkway to be as square as possible for later when I tile over it).
3. I marked the concrete through the holes in the wood with a black marker.
4. I drilled into the concrete where the hole marks were using a 3/8" masonry bit and a hammer drill. I went in at lease 1 ½ ".
5. I used 3 3/4" long, 3/8" Red Head anchor bolts and tapped them into the holes.
Caution: when knocking the anchor bolts into the concrete, put a wood block on top of the bolts and strike the wood instead of the bolts directly, otherwise you will probably damage the bolts threads.
6. Feed the wood through the bolts and secure the pressure treated wood to the concrete with the 3/8" nuts provided with the anchor bolt kit. Use a large washer or a fender washer, then a lock washer between the wood and the nut. Tighten slowly to make sure that all the anchor bolts are expanded correctly, If they did, you should be able to get it really tight with a socket or a wrench.
Note: If any of your bolts don't line up, make sure you didn't accidentally rotate the wood 180 degrees. If that's right, your drill might have walked a little when you were drilling the holes into the concrete as some of mine did. You can widen the holes on the wood a little if it isn't too far off. It shouldn't matter if you are using fender washers. The ½" hole is oversized and will give you a 1/8" of play, so that will help a little.
