Drywall Over Brick: Furring, Adhesive, and Moisture Control

An old interior brick wall can look rustic in one room and simply dark and dusty in another. Hanging drywall over brick turns a rough masonry surface into a smooth, paintable wall, and it gives you a chance to add insulation, run wiring and hang shelves without drilling into mortar every time. The method you choose, furring strips or direct adhesive, depends on how flat the brick is and, more importantly, whether that wall ever gets damp.

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The quick answer: for most brick walls, especially exterior walls or anything below grade, attach wood or metal furring strips to the brick with masonry screws, add rigid foam insulation between them if you want, and screw the drywall to the strips. For a dry, flat interior brick partition, construction adhesive can bond drywall directly to the masonry, but it leaves no room for insulation or wires and fails if moisture gets behind it. Either way, address moisture first.

Some builders call this plasterboard over brick, particularly in older homes that once had plaster applied straight to the masonry. The principles are the same.

Is Drywall Over Brick the Right Choice?

Before you commit, check three things. First, is the wall an exterior wall, a chimney breast, or a basement or partially buried wall? Those walls can transfer moisture and cold, so they need an air gap or insulation and a moisture strategy. Second, is the brick sound? Crumbling mortar, loose bricks or efflorescence (white, powdery salt deposits) point to water moving through the wall. Third, is the brick flat? Old brick can bow or step out by an inch or more, which rules out direct adhesive.

A chimney breast needs extra care. Keep combustible materials, including wood furring and drywall, at the clearances your local code and the chimney construction require. Where clearance is limited, use metal furring and follow code for any fireplace or chimney surround. If the fireplace is still in use, consult a chimney professional before covering nearby masonry.

Moisture Control Comes First

Brick is porous. On an exterior wall it absorbs rain and releases moisture inward; in a basement it wicks ground moisture. Drywall glued or screwed tightly against damp brick will stain, soften and grow mold.

• Look for signs of water: damp patches, efflorescence, peeling paint or a musty smell. Tape a 2 foot square of plastic sheet to the brick for 48 hours; condensation on the inside of the plastic means moisture is coming through the wall.
• Fix exterior causes: repoint failing mortar, clean gutters, extend downspouts and make sure soil slopes away from the foundation.
• Use an air gap or foam: furring strips create a small gap that lets the wall dry. Rigid foam board insulation (extruded or foil-faced polyiso) against the brick acts as a moisture-tolerant thermal break.
• Be careful with vapor barriers: a polyethylene sheet on the warm side can trap moisture between it and damp brick in some climates. Follow local building guidance for your climate zone. Many cold-climate basement details rely on foam board taped at the seams instead of plastic sheeting.
• Choose moisture-resistant board: for basements and damp-prone walls, mold-resistant drywall is a sensible upgrade.

If you already see mold on the brick or old wall finishes, clean small areas with detergent and water while wearing gloves and an N95 respirator, let the wall dry fully, and fix the water source. Call a mold remediation pro for areas larger than about 10 square feet.

Furring Strips vs Direct Adhesive

Furring Strips

Furring is the most forgiving method. You fasten 1×3 or 2×2 wood strips, or metal hat channel, vertically to the brick at 16 inches on center, shimming them to create a flat plane. Drywall screws into the strips. Benefits include a flat wall even over uneven brick, space for insulation and shallow electrical boxes, and an air gap that helps the wall dry. The trade-off is lost floor space, typically 1 to 2 inches.

Direct Adhesive

Gluing drywall straight to brick uses construction adhesive or a gypsum-based bonding compound applied in dabs. It saves space and time. It only works when the brick is dry, clean, flat within about 1/4 inch over 8 feet, and not painted with a loose finish. It leaves no room for insulation or wiring, and if moisture appears later, the bond can fail and the board can stain. Reserve this method for interior partition walls that have never shown dampness.

Framed Stud Wall

For badly bowed brick, a basement, or a wall where you want more insulation, build a 2×4 or 2×3 stud wall a half inch in front of the brick. Pressure-treated bottom plates are standard on concrete floors. This uses the most space but gives the best result on difficult walls.

Tools and Materials

• Hammer drill with carbide masonry bits (a standard drill struggles in brick)
• Masonry screws (concrete screws) sized for your furring thickness
• Furring strips or metal hat channel, plus shims
• Rigid foam insulation board and foam-compatible adhesive (optional)
• Drywall panels (regular or mold-resistant), drywall screws and a screw gun
• Construction adhesive for masonry (for the adhesive method)
• 4 foot level or straightedge, chalk line and tape measure
• Joint tape, joint compound, corner bead and knives
• Safety glasses, hearing protection, gloves and an N95 or P100 respirator
• Shop vacuum with a HEPA filter and a spray bottle for dust control

Step-by-Step: Hanging Drywall on Furring Strips

1. Prep the wall. Brush off loose mortar and dust, repoint any failed joints, and let repairs cure. Remove old nails and fixtures.
2. Find the high spots. Hold a long level against the brick in several places and mark where it bulges out. The furring must be shimmed out to meet the highest point.
3. Lay out the strips. Snap vertical lines at 16 inches on center, plus strips at the corners and around windows and doors. Add horizontal strips at the top and bottom.
4. Drill pilot holes. Use a hammer drill and the bit size the screw maker specifies. Drill into solid brick rather than the mortar joint where possible, about every 16 to 24 inches along each strip.
5. Fasten the furring. Drive masonry screws through the strips, shimming behind them where needed until a straightedge shows a flat plane.
6. Add insulation (optional). Cut rigid foam to fit between the strips, bond it with foam-safe adhesive, and tape the seams if it is serving as your moisture layer.
7. Plan electrical work. Any new outlets or switches on this wall require shallow boxes and should be installed by a licensed electrician. Turn off the breaker and confirm power is off with a non-contact voltage tester before touching existing wiring.
8. Hang the drywall. Run sheets horizontally or vertically so seams land on furring. Screw every 8 to 12 inches, keeping screws 3/8 inch from the edges, and slightly dimple each head without tearing the paper.
9. Finish. Tape seams and corners, apply two or three coats of compound, sand, prime and paint.

Step-by-Step: Direct Adhesive Method

1. Confirm the wall is dry, clean and flat. Scrape off loose paint and wash dusty brick.
2. Apply dabs of adhesive or bonding compound about 2 inches wide, spaced roughly 12 inches apart in rows, plus a continuous bead around the sheet perimeter.
3. Press the drywall onto the dabs and tap it flat with a straightedge. Add a few masonry screws or temporary bracing to hold it while the adhesive sets.
4. Leave a small gap at the floor to keep the board from wicking any moisture.
5. Finish the seams once the adhesive has cured per the label.

Silica Dust Safety When Drilling Brick

Drilling, cutting or grinding brick and mortar releases crystalline silica dust, which damages lungs with repeated exposure. Wear an N95 respirator at minimum, or a P100 for extended drilling, plus safety glasses. Mist the drilling spot lightly or use a drill with a dust-extraction shroud connected to a HEPA vacuum. Clean up with a HEPA vacuum or wet wipes rather than sweeping, and keep other people out of the room while you drill. If you are cutting brick to fit an opening, use a wet saw or a saw with a dust shroud.

Troubleshooting

• Masonry screws spin out: the hole is oversized or you hit soft mortar. Move over and drill a new hole into solid brick, or use a larger screw.
• Wall looks wavy: the furring was not shimmed to a common plane. Check with a straightedge before hanging board.
• Stains or softness after a season: moisture is getting through. Remove a section, find the source, and add an air gap or foam layer.
• Glued board let go: the brick was dusty, painted or damp. Switch to furring.
• Bricks crack when drilling: turn off hammer mode for the first few millimeters and use a sharp bit.

Cost of Covering a Brick Wall With Drywall

For a typical 12 by 8 foot wall, DIY materials usually run about $100 to $300 for furring, masonry screws, drywall and finishing supplies, plus roughly $80 to $200 more if you add rigid foam insulation. A hammer drill can be rented for a day or bought for a modest price and is worth it for the time it saves. A contractor generally charges about $2 to $5 per square foot of wall for furring, hanging and finishing, with higher costs for framed walls, insulation or electrical work.

When to Call a Pro

Hire a mason if mortar is failing or bricks are loose, and a waterproofing contractor if the wall shows active leaks or ongoing dampness. Bring in a licensed electrician for new outlets or switches, and check with your building department about permits for basement finishing or insulation work. A drywall contractor is a good call for tall walls, chimney breasts or when you want a level 5 finish under bright light.