How to Add Blocking Behind Drywall

🧱 How to Add Blocking Behind Drywall

Install solid backing inside your wall for things like shelves, TVs, or towel bars — even after the drywall is already up.

🧰 Tools & Materials Needed:

• Stud finder

• Drill or impact driver

• 3” wood screws

• Drywall saw or oscillating multi-tool

• Measuring tape & pencil

• 2x4 or plywood blocking piece

• Wood glue or construction adhesive (optional)

• Drywall patch material (piece of drywall or patch kit)

• Joint compound, putty knife, sandpaper

🕒 Estimated Time: 45–90 minutes

🔨 Step-by-Step Instructions:

1. Mark the Area for Blocking

• Use a stud finder to locate the studs near your target area

• Mark your desired mounting height (e.g., where a TV or shelf will go)

• Lightly draw a square or rectangle cutout large enough to fit your hand and blocking

2. Cut Into the Drywall

• Carefully cut the marked opening using a drywall saw or multi-tool

• Save the piece if possible for patching later

• Vacuum the edges to remove any dust

3. Measure and Prepare Your Blocking

• Cut a 2x4 or piece of plywood to fit horizontally between studs

• For heavy loads (like TVs), use a full 2x4

• Add glue to the ends (optional) and secure into the adjacent studs with screws

4. Secure the Blocking in Place

• Insert the blocking into the wall cavity

• Use screws through the existing studs at each end to secure it

• Double-check that it sits flush with the back of the drywall

5. Patch the Wall

• Replace your drywall piece or use a new patch

• Apply joint compound around edges, smooth it out with a putty knife

• Let dry, sand, and apply a second coat if needed

• Prime and paint to match the surrounding wall

✅ Pro Tips:

• Use painter’s tape around your cut area to protect the finish

• Always mount items directly to blocking or studs — drywall alone won’t hold long

• If this seems like a big job, consider pre-installing blocking during your next reno project

📸 Bonus Tip Video:

[🎥 Watch: How We Add Hidden Blocking During Renovations]Follow us on Instagram: @rgwallsottawa

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