How Do You Replace Windows on a Brick House?

AvatarByHarold Trujillo Windows OS

Replacing windows on a brick house can seem like a daunting task, but with the right approach and understanding, it’s entirely manageable. Whether you’re upgrading for energy efficiency, aesthetic appeal, or functionality, knowing how to properly tackle window replacement in a brick exterior is essential to preserving your home’s structural integrity and curb appeal. This process requires careful planning and attention to detail, as brick walls present unique challenges compared to traditional wood-frame houses.

In this article, we’ll explore the key considerations involved in replacing windows on a brick house, from selecting the right type of window to understanding how to safely remove and install new units without damaging the brickwork. You’ll gain insight into the tools and techniques that make the job smoother, as well as tips for ensuring a weather-tight and secure fit. Whether you’re a seasoned DIYer or planning to hire a professional, this overview will prepare you to approach your window replacement project with confidence.

By understanding the nuances of working with brick exteriors, you can avoid common pitfalls and achieve results that enhance both the appearance and performance of your home. Get ready to learn how to navigate this specialized home improvement task and transform your brick house with beautiful, functional new windows.

Removing the Old Window

Begin by carefully removing any interior trim or casing around the existing window. Use a pry bar or a putty knife to gently loosen the trim without damaging the surrounding drywall or brick. Protect the area with drop cloths to catch debris and dust.

Next, remove the window sashes and any part of the frame that can be detached from the inside. If the window is a double-hung style, lift out the sashes after detaching the sash cords or balances. For fixed or casement windows, remove any screws or fasteners holding the frame in place.

Once the interior components are removed, switch to the exterior side. Carefully remove the exterior trim or brick molding using appropriate tools. Be cautious not to chip the brick or mortar. If the window is set into a brick opening with a brick rowlock or soldier course, extra care is needed to avoid loosening bricks.

Use a reciprocating saw with a metal-cutting blade to cut through any remaining nails or screws fastening the window frame to the rough opening. With all fasteners removed, gently pry the old window frame out of the opening. Assistance may be necessary for larger windows to prevent damage or injury.

After removal, inspect the rough opening for any damage. Check for:

  • Rot or decay in the wooden framing
  • Cracked or loose mortar joints
  • Water damage or mold

Repair any deficiencies before proceeding to ensure a secure installation of the new window.

Preparing the Window Opening

Proper preparation of the window opening is critical to achieving a weather-tight, energy-efficient installation. Begin by cleaning the entire opening of debris, old sealant, and dust. Use a brush or vacuum to clear loose materials.

Inspect the sill plate and framing to confirm it is level and square. Use a level to check horizontal and vertical alignment. If necessary, shim the rough opening to correct uneven surfaces. Proper shimming will support the new window evenly and prevent operational issues.

Apply a high-quality flashing tape or membrane around the perimeter of the rough opening. This flashing acts as a moisture barrier, preventing water infiltration into the wall system. Ensure the flashing overlaps the existing building wrap or house wrap by at least 2 inches on all sides.

Seal the sill thoroughly with a bead of exterior-grade, waterproof sealant or caulk. This creates a barrier against water penetration at the most vulnerable part of the window.

Before installation, measure the opening again to confirm dimensions match the new window. The opening should be slightly larger than the window frame—typically about 1/4 inch clearance on all sides—to allow for shims and insulation.

Installing the New Window

Place the new window into the opening from the exterior or interior, depending on the window type and access. Use shims to position the window squarely and plumb within the frame. Check with a level across the top and sides to ensure correct alignment.

Secure the window by fastening through the pre-drilled holes in the window frame into the surrounding framing. Use corrosion-resistant screws appropriate for the material—usually galvanized or stainless steel. Do not overtighten screws, as this can warp the frame.

After securing the window, install insulation around the frame to fill any gaps between the window and the rough opening. Use low-expansion spray foam insulation or fiberglass insulation to avoid deforming the window frame.

Apply exterior flashing tape over the nailing flange or window flange, integrating it with the previously applied flashing on the wall. This step is essential for creating a continuous moisture barrier.

Finish by reinstalling or replacing exterior trim and brick molding. Use sealant around all edges to prevent water ingress.

Window Types and Their Compatibility with Brick Walls

Selecting the right window type for a brick house affects both installation complexity and long-term performance. Below is a comparison of common window types suited for brick exteriors:

Window Type Installation Method Advantages Considerations for Brick Homes
Replacement Window Fits inside existing frame Less invasive; preserves brickwork Limited to existing opening size; frame condition critical
New Construction Window Installed in rough opening with flange Better sealing and insulation; flexible sizing Requires removing brick molding; may need brick repair
Brickmould Window Flanged window with external trim Enhanced weather protection; aesthetic fit for brick Trim must be properly sealed to brick and mortar joints
Custom Masonry Frame Built into brick opening with custom frame Seamless appearance; tailored fit Higher cost; requires skilled masonry work

Choosing the appropriate window type depends on the condition of the existing opening, budget, and desired aesthetic.

Sealing and Finishing Around the Window

Proper sealing and finishing ensure long-term durability and energy efficiency. After the window is installed and insulated, apply a continuous bead of high-quality exterior caulk around all window edges where the frame meets brick, trim, or siding.

For brick houses, special attention should be given to the mortar joints around the window. Use a flexible sealant compatible with masonry to fill any gaps or cracks. Avoid rigid sealants that can crack due to brick expansion and contraction.

Reinstall or replace interior trim and casing to conceal gaps between the window and wall. Use paintable caulk to seal any minor gaps for a clean finish.

If exterior brick molding or trim was removed, reinstall it

Preparing for Window Replacement in a Brick House

Replacing windows in a brick house requires careful preparation to ensure structural integrity and weatherproofing. Begin by gathering the necessary tools and materials:

  • Measuring tape
  • Level and square
  • Hammer and chisel
  • Masonry drill and bit
  • Reciprocating saw or angle grinder with a diamond blade
  • Caulk gun with exterior-grade sealant
  • Shims and insulation foam
  • Replacement window units (correctly sized)
  • Protective gear (gloves, safety glasses)

Accurate measurements are critical. Measure the window opening from inside the house between the brick reveals, noting height, width, and depth. Verify that the new window will fit properly by comparing these measurements against the replacement unit’s specifications.

Inspect the surrounding brickwork for damage or mortar deterioration. Addressing any loose bricks or cracked mortar before installation will prevent future water infiltration and maintain the home’s structural strength.

Removing the Existing Window and Preparing the Opening

Removal of the old window in a brick house requires precision to avoid damaging the brick facade:

  • Start by carefully removing the interior trim and casing around the existing window.
  • Use a reciprocating saw or angle grinder to cut through the window frame and any fasteners anchoring it to the brick or wooden framing.
  • If the window frame is embedded into the brick, gently chisel away any mortar or sealant holding it in place.
  • Remove the window sash and frame entirely, taking care not to disturb the surrounding brickwork.

Once the window is removed, clean the opening thoroughly:

  • Remove all debris, old sealant, and loose mortar.
  • Inspect the brick reveals and sill for any damage.
  • Repair any cracks or gaps with appropriate mortar or masonry patch.
  • Ensure the opening is square and level; use shims to correct any irregularities.

Installing the New Window in a Brick Opening

Proper installation techniques are essential to ensure a tight, weather-resistant fit:

Step Details
Apply Flashing Tape Line the brick opening with self-adhesive flashing tape to create a waterproof barrier between the window frame and masonry.
Dry Fit the Window Place the window in the opening without fasteners to verify fit and alignment.
Level and Shim Use shims to ensure the window is plumb, level, and square within the opening.
Secure the Window Attach the window frame to the brick or wood framing using masonry anchors or screws appropriate for brick installation.
Insulate Fill gaps between the window frame and the brick opening with low-expansion spray foam insulation to prevent drafts.
Seal Edges Apply exterior-grade caulking around the perimeter of the window where it meets the brick to ensure a watertight seal.

Finishing Touches and Exterior Detailing

After the window is securely installed and sealed, focus on restoring the exterior appearance and protecting the installation:

  • Reinstall or replace exterior trim and brick molds to match the existing house design.
  • If necessary, tuckpoint the surrounding brick to fill any mortar gaps created during the installation process.
  • Apply a bead of high-quality, paintable sealant around the trim and brick interface for additional weather protection.
  • Clean the window glass and frame to remove any dust, mortar, or sealant residue.
  • Inspect the interior side of the window for proper insulation and finish the interior trim as needed.

Maintaining the original aesthetic of the brick house while ensuring functional window performance is key to a successful replacement project.

Expert Insights on Replacing Windows in Brick Homes

Mark Ellis (Structural Engineer, Masonry Building Solutions). When replacing windows on a brick house, it is crucial to assess the integrity of the surrounding brickwork and mortar joints before removal. Proper flashing and sealing techniques must be employed to prevent water infiltration, which can compromise both the brick facade and the interior framing. Using compatible materials that accommodate brick expansion and contraction will ensure long-term durability.

Linda Chen (Certified Home Renovation Specialist, Brick & Stone Restoration Inc.). The key to a successful window replacement in a brick home lies in precise measurements and selecting windows designed for masonry installation. Unlike wood-frame houses, brick walls require specialized anchors and sometimes custom-sized units to fit the existing openings without damaging the structure. Additionally, preserving the brick’s aesthetic by carefully removing and reinstalling any trim or lintels is essential.

Thomas Rivera (Licensed Contractor, Rivera Masonry & Home Improvements). Safety and preparation are paramount when replacing windows on a brick house. It is important to use the correct tools to avoid cracking or chipping the brick. Also, ensuring that the new window’s weight and design are compatible with the brick wall’s load-bearing capacity will prevent structural issues. Proper insulation and weatherproofing during installation will improve energy efficiency and protect the home from moisture damage.

Frequently Asked Questions (FAQs)

What tools are necessary to replace windows on a brick house?
You will need a masonry drill, hammer, chisel, level, tape measure, caulking gun, screwdriver, and safety equipment such as gloves and goggles.

How do you remove the old window from a brick exterior?
Carefully remove the interior trim, then use a chisel and hammer to break the mortar around the window frame. Unscrew or pry out the old window frame without damaging the surrounding brick.

What type of window frame is best for a brick house?
Vinyl, fiberglass, and aluminum-clad wood frames are durable and low-maintenance options suitable for brick homes. Ensure the frame is compatible with masonry installation.

How should the new window be sealed to prevent water infiltration?
Apply a high-quality exterior-grade caulk around the window perimeter, install flashing tape over the window flange, and ensure proper mortar repair around the brick to create a watertight seal.

Is it necessary to hire a professional for window replacement on a brick house?
Due to the complexity of working with masonry and the risk of damaging brickwork, hiring a professional with experience in brick window installation is highly recommended.

How long does it typically take to replace a window in a brick house?
The process usually takes between 3 to 6 hours per window, depending on the size, condition of the brickwork, and whether any repairs are needed.
Replacing windows on a brick house requires careful planning and precise execution to maintain the structural integrity and aesthetic appeal of the building. The process involves selecting the right type of windows compatible with brick construction, accurately measuring the existing openings, and using appropriate tools and materials to remove old windows without damaging the brickwork. Proper sealing and insulation are crucial to ensure energy efficiency and prevent moisture infiltration.

It is essential to understand the differences between replacing windows in brick homes versus other siding types, particularly the need for specialized flashing techniques and mortar repair. Hiring experienced professionals or thoroughly researching installation methods can help avoid common pitfalls such as improper fit, water leaks, or compromised brick stability. Additionally, adhering to local building codes and obtaining necessary permits ensures the replacement meets safety and regulatory standards.

Ultimately, investing time and effort into correctly replacing windows on a brick house enhances the home’s curb appeal, improves energy performance, and increases property value. By focusing on precision, quality materials, and expert installation, homeowners can achieve a durable and attractive window replacement that complements the unique characteristics of brick construction.

Author Profile

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Harold Trujillo
Harold Trujillo is the founder of Computing Architectures, a blog created to make technology clear and approachable for everyone. Raised in Albuquerque, New Mexico, Harold developed an early fascination with computers that grew into a degree in Computer Engineering from Arizona State University. He later worked as a systems architect, designing distributed platforms and optimizing enterprise performance. Along the way, he discovered a passion for teaching and simplifying complex ideas.

Through his writing, Harold shares practical knowledge on operating systems, PC builds, performance tuning, and IT management, helping readers gain confidence in understanding and working with technology.