Step-drilling in masonry
When I build decks or additions, I often have to fasten a ledger with lag bolts and lead shields to an existing masonry wall. This process can be maddening because a few of the holes always end up a little off layout. The problem is that a big masonry drill bit has a tendency to wander off its mark. To avoid this problem, I first drill my holes in the ledger, then mark their center points on the masonry. Then I start drilling the holes in the masonry with a 1/8-in. bit, followed by a 5/16-in. bit and finally a 1/2-in. or 5/8-in. bit, depending on the diameter of the lead shield that I’m inserting. This extra effort takes only a few minutes, and it consistently yields accurate results.
John A. Neer, Alexandria, VA
Why don't you use an anchor Bolt? It's super easy just put the ledger where you want then drill through the wood with a wood bit and through the Masonry with a masonry bit and then tap the bolt into the hole and tighten it. That's it, I do it all the time.
Exactly thats what I do. Tony cerrito deptford new jersey
I prefer to use Hilti bolts. Drill then just run it through everything with and impact driver. Have even anchored machinery do n with them. Nothing NGK has moved to date.
Some people pin the ledger in place w/ a couple of PAT nails, then drill the concrete. As far as fasteners, I like Titens from Simpson- they give good clamping and shear and don't exert a lot of expansive force, which can split concrete if you get unlucky.