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Installing Ledger Boards on Masonry

Project Overview

Installing Ledger Boards on Masonry

Like other ledger installations, a ledger mounted on concrete block or a concrete wall requires flashing. You can install the flashing in a kerf cut into the wall or insert it between the ledger and the wall and bend it to cover the top of the ledger. Masonry bolts or lag shields are an option to epoxied threaded studs for attaching the ledger.

3 Steps

  1. Mark the Location
  2. Squeeze in the Epoxy
  3. Install Threaded Stud
Mark the Location
Mark the Location

Step 1

Mark the Location

Outline the position of the ledger on the concrete surface with a permanent marker. Because wall surface material isn't cut and removed, you don't need to allow space for the rim joists. Cut the ledger to length, market the location of the joists, and prop the ledger in place. Make sure it's level and stays that way. Then drill pilot holes for the fasteners in the ledger. Change to a masonry bit of the same diameter as the wood bit and drill a 3-inch deep hole into concrete.

Squeeze in the Epoxy

Step 2

Squeeze in the Epoxy

Insert an epoxy screen into the hole (a round screen that gives the epoxy additional tooth I the hole and is made especially for this purpose). Following the manufacturer's instructions, push the recommended amount of structural epoxy into the hole. (One syringe usually contains enough epoxy for six holes.) Always wear gloves while handling epoxy - and follow the manufacturer’s safety recommendations.

Install Threaded Stud
Install Threaded Stud

Step 3

Install Threaded Stud

Quickly insert a threaded stud into the hole. (You have only a few minutes before the epoxy begins to harden.) Let the epoxy harden completely (usually for 24 hours, depending on weather conditions), following manufacturer's directions. Install a washer and nut on each stud and tighten until the washer compresses the wood underneath. Check the bolts after 24 hours and tighten if necessary. Apply a heavy bead of silicone caulk on the joint between the top edge of the ledger and the wall, and seat the metal flashing into it. Apply another bead of caulk along the joint at the top edge of the flashing.

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Project Details

Skill Level: Intermediate

Time: 3 hours

Before you start, read this »

Due to differing conditions, tools, and individual skills, The Home Depot® assumes no responsibility for any damages, injuries suffered, or losses incurred as a result of attempting to replicate any of the home improvement ideas portrayed in this website Before beginning any home improvement project, review it thoroughly to ensure you or your contractor can finish the project and if any doubts or questions remain, consult local experts or authorities. Because codes and regulations vary greatly, you always should check with authorities to ensure that your project complies with all applicable local codes and regulations. Always read and observe all of the safety precautions provided by any tool or equipment manufacturer, and follow all accepted safety procedures.

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