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Blocking the Joists

Project Overview

Blocking the Joists

Install blocking between joists to prevent twisting, especially on spans longer than 8 feet. Measure each piece of blocking separately to allow for any difference in the thickness of the joists. This will keep the blocking from bowing the joists.

3 Steps

  1. Mark Position for Blocking
  2. Attach Blocking
  3. Attach Joists to the Beam
Mark Position for Blocking

Step 1

Mark Position for Blocking

Snap a chalk line across joists at the center of the joists. This line locates the position for blocking pieces.

Attach Blocking

Step 2

Attach Blocking

Fasten the blocking between the joists with 3-inch galvanized spiral-shank nails or 3-inch screws. Attach blocking between adjacent joists on opposite sides of the chalk line to allow you to face-nail the fasteners.

Attach Joists to the Beam

Step 3

Attach Joists to the Beam

Attach the joists to the beam with rafter/hurricane ties or joist hangers. Install ties on the less-visible side of the beam, if possible, driving the kind of nail specified by the manufacturer through every nail hole in the connector.

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Project Details

Skill Level: Beginner

Time: 2 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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