If you need to relocate a garage door or add a new entry door to an existing brick wall, the task of cutting through brick masonry can seem daunting. Whether you are moving a 16-ft. garage door to a different wall in a one-story hip-roof garage or simply adding a side door to your workshop, the process requires careful planning, the right tools, and a methodical approach. Brick is a durable and long-lasting building material, but cutting through it to create a door opening demands precision to maintain structural integrity and achieve a professional finish. This guide walks you through the entire process, from planning and safety considerations to cutting, framing, and finishing the new door opening.
1. Planning and Preparation for Cutting a Brick Wall
Before picking up any tools, spend time planning the new door opening. Proper preparation prevents costly mistakes and ensures the final result is structurally sound and visually appealing.
Understanding the Wall Construction
Most exterior brick walls on garages and homes are not solid brick. They consist of a brick veneer outer layer with conventional wood framing behind it. The brick veneer is a non-load-bearing skin attached to the structural wood frame. The interior typically features 2×4 or 2×6 stud framing with sheathing, insulation, and drywall. Understanding this layered construction is critical because the structural work happens on the wood frame, while the brick cutting is primarily cosmetic and weatherproofing.
Determining the Door Size and Rough Opening
Start by selecting the door you plan to install. Standard garage doors come in widths of 8 ft., 9 ft., 10 ft., 12 ft., 14 ft., and 16 ft. For pedestrian doors, standard sizes are 32 in., 34 in., and 36 in. wide by 80 in. tall. The rough opening (the framed opening in the wall) must be larger than the door itself. For a garage door, the rough opening width equals the door width plus about 1.5 in. for clearance. The height equals the door height plus the header depth and clearance. For a pedestrian door, the rough opening is typically 2 in. wider and 2 in. taller than the door slab.
Obtaining Necessary Permits
Cutting a new door opening in an exterior wall is a structural modification that almost always requires a building permit. Contact your local building department to understand the requirements. You will likely need to submit drawings showing the header size, lintel specifications, and bearing details. Working without a permit can lead to fines and complications when selling the property.
2. Tools and Materials Required
Cutting brick and installing a door requires a combination of masonry tools and carpentry equipment. Having everything ready before you start keeps the workflow smooth.
Masonry Cutting Tools
- Angle grinder with a diamond masonry blade (7 in. or 9 in. blade recommended for deep cuts)
- Masonry saw or cutoff saw for longer straight cuts
- Rotary hammer drill with masonry bits for anchor holes
- Cold chisel and heavy hammer for breaking out bricks
- Safety equipment: respirator (silica dust is hazardous), safety glasses, hearing protection, and heavy work gloves
Structural and Framing Materials
- Steel lintel or reinforced concrete lintel sized for the span
- Pressure-treated lumber for the door frame and header
- Galvanized steel angles or lintel supports at each end
- Mortar mix for patching and repointing
- Expansion anchors or masonry screws for attaching the lintel
Door Installation Materials
- Pre-hung door unit or door slab with frame lumber
- Shims, screws, and nails
- Weatherstripping and door sweep
- Flashing tape and caulk for weatherproofing
- Insulation for filling gaps around the frame
3. Step-by-Step Process for Cutting the Brick Opening
Once planning is complete and tools are ready, the actual work begins. Follow these steps methodically to achieve a clean opening.
Step 1: Mark the Opening on the Interior Wall
Begin work from inside the garage or building. Remove the interior drywall or wall covering to expose the wood stud framing. Mark the rough opening dimensions on the studs and bottom plate. Use a level to ensure all lines are plumb and square. The rough opening width should accommodate the door plus the jambs. For a 16-ft. garage door, the rough opening is typically 16 ft. 1 in. to 16 ft. 2 in. wide.
Step 2: Install Temporary Support
Before cutting any studs, install temporary supports. The wall above the new opening must be held up while you remove framing members. Use adjustable metal jack posts or temporary stud walls placed 2 ft. to 4 ft. from each side of the opening. These supports transfer the roof or upper floor load to the floor while you work on the opening.
Step 3: Frame the Header and King Studs
With temporary supports in place, cut the existing studs at the height of the new header. Install a properly sized header across the top of the opening. The header size depends on the span and the load it carries. For a 16-ft. garage door opening, you may need a built-up header using two 2x12s with plywood sandwiched between them, or an engineered LVL (laminated veneer lumber) beam. Install king studs at each end of the opening and trimmer studs (jack studs) supporting each end of the header. Secure everything with appropriate nails or screws following local building codes.
Step 4: Mark and Cut the Brick Veneer from Outside
Once the interior framing is complete and the header is in place, move to the exterior. Transfer the rough opening dimensions to the brick veneer. Measure from a reference point and mark the cut lines clearly with chalk or a marker. The cut line on the brick should extend about 1 in. beyond the rough opening on each side and above the header height to allow for the lintel bearing. Use a straightedge or chalk line to ensure straight cuts.
Cutting technique:
- Score the cut line with an angle grinder fitted with a diamond blade. Make the first pass shallow (about 1/4 in. deep) to establish the line.
- Deepen the cut with repeated passes, increasing depth each time. Diamond blades cut best when used with a light touch, allowing the blade to do the work.
- Cut completely through the brick veneer. The cut depth should be the thickness of the brick plus the mortar bed, typically about 4 in. to 5 in.
- For horizontal cuts at the top of the opening, cut through the mortar joints between bricks rather than through the bricks themselves when possible. This produces a cleaner result and is easier to patch later.
- For vertical cuts, cut through the bricks themselves. Plan the cut so it falls near the center of a brick rather than at a mortar joint, which gives better bearing for the lintel.
Step 5: Remove the Cut Brick Sections
After completing all cuts, remove the bricks within the opening. Work from the top down. Insert a cold chisel into the cut lines and tap gently with a hammer to break the bricks free. Remove bricks one at a time. Clean up the cut edges with a chisel or grinder to create a smooth bearing surface for the lintel. Clear all debris from the opening before proceeding.
4. Installing the Lintel and Finishing the Opening
The lintel (also called a header in masonry terms) is a critical structural element that supports the brickwork above the new opening. Proper installation prevents windows and doors from binding and stops cracks from forming in the brickwork.
Selecting and Installing the Lintel
For most residential garage door openings, a steel angle lintel is the standard choice. The lintel should bear at least 4 in. on each side of the opening and extend into the solid brickwork beyond the cut. Use a steel angle that is at least 3/16 in. thick with legs sized to support the brick thickness. For a brick veneer wall, a 3 in. by 3 in. or 4 in. by 3 in. steel angle is common. Bed the lintel in a full mortar bed to ensure even load distribution. Secure the lintel to the wood framing behind using expansion anchors or through-bolts installed through pre-drilled holes in the steel.
Patching and Repointing the Brickwork
After the lintel is installed, patch the cut edges of the brickwork. Mix mortar to match the existing color and consistency. Fill any gaps between the lintel and the brick above. Repoint the mortar joints along the cut edges so they match the surrounding brickwork. Allow the mortar to cure for at least 24 to 48 hours before applying any load or further finishing.
Installing the Door
With the brick opening complete and the interior framing ready, install the door:
- Set the pre-hung door unit into the rough opening from the exterior. Center it and check for plumb using a 4-ft. level on both side jambs.
- Insert shims between the frame and the rough opening at the hinge locations and latch side. Adjust the shims until the frame is plumb and the gaps are uniform.
- Secure the frame through the shims with 3-in. screws driven into the trimmer studs. Do not overtighten, as this can bow the frame.
- Install the door slab if it came separately. Check the gap between the door and the frame, which should be about 1/8 in. all around.
- Install weatherstripping around the perimeter of the door frame and a door sweep at the bottom.
Weatherproofing and Flashing
Proper weatherproofing is essential where the new door meets the brick wall. Install flashing tape over the header area, extending it up behind the brick veneer and down over the top of the door frame. Apply a bead of high-quality exterior caulk between the door frame and the brick on all sides. On the interior, insulate the gaps around the door frame with spray foam or fiberglass insulation before reinstalling the drywall and trim.
5. Common Challenges and Troubleshooting
| Challenge | Cause | Solution |
|---|---|---|
| Uneven brick cut edges | Dull blade or excessive feed rate | Replace diamond blade and make multiple light passes |
| Cracks spreading beyond cut area | Insufficient temporary support or cutting too aggressively | Install additional supports; use shallow scoring passes first |
| Door does not fit the opening | Incorrect rough opening dimensions | Re-measure the door unit and adjust framing accordingly |
| Lintel not level | Uneven mortar bed or brick bearing surface | Remove lintel, level the bearing surface with mortar, reinstall |
| Water leaking around door frame | Missing or improperly installed flashing | Remove trim, install proper step flashing and caulk all seams |
| Brick dust staining surrounding wall | Cutting without wetting or dust control | Use water spray while cutting; clean with masonry cleaner |
Safety Considerations
Cutting brick generates significant amounts of silica dust, which is hazardous when inhaled. Always wear a properly fitted N95 or higher respirator. Use a wet-cut technique when possible to control dust. If dry cutting, use a vacuum attachment on the grinder. Wear cut-resistant gloves when handling broken brick and chisels, as sharp edges can cause deep cuts. Never remove temporary supports until the header and lintel are fully installed and the mortar has cured. Always work with a helper when handling heavy steel lintels and door units.
Conclusion
Cutting a brick wall to install a new door opening is a challenging but achievable project for experienced DIYers and professionals alike. The key to success lies in careful planning, the correct sequence of work, and attention to structural details. By using the right brick masonry tools, installing a proper lintel, and following building codes for header sizing and temporary support, you can create a clean, durable door opening that will last for decades. Understanding the types of bricks and their properties also helps in matching the repair work to the existing wall. For more detailed guidance on finishing the door installation, refer to our comprehensive door design and installation guide.