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How to Seal Gap Between Window and Brick Wall: A Step-by-Step Guide


Are you tired of dealing with air drafts, water leakage, or even unwelcome pests entering your home through the gaps between your windows and brick walls? If so, it’s time to take action and seal those gaps effectively. In this comprehensive guide, we will walk you through the process of sealing the gap between your window and brick wall, ensuring a more energy-efficient, comfortable, and secure living environment.

Visible gap between window frame and brick wall.
Visible gap between window frame and brick wall.

Understanding the Gap between Window and Brick Wall

Before we dive into the step-by-step guide, let’s understand why gaps form between windows and brick walls and the potential issues they can cause. Gaps can occur due to building settling, poor installation, or natural wear and tear over time. Regardless of the cause, these gaps can lead to problems such as air drafts, moisture penetration, heat loss, and even pest infestation. By sealing these gaps, you can mitigate these issues and improve the overall performance of your windows.

Applying caulk along the gap between window and brick wall.
Applying caulk along the gap between window and brick wall.

Step-by-Step Guide: How to Seal the Gap between Window and Brick Wall

Gather the Necessary Tools and Materials

Before you begin sealing the gap, make sure you have all the required tools and materials at hand. These may include:

  • Caulk gun
  • Weatherstripping
  • Putty knife
  • Silicone caulk
  • Foam backer rod (if needed)
  • Cleaner and rag for surface preparation
  • Paintbrush or sealant finishing tool

Prepare the Area

To ensure a proper seal, it’s crucial to prepare the area before applying any sealant. Start by cleaning the gap and removing any old sealant or debris using a putty knife or appropriate cleaning solution. This will provide a clean surface for the new sealant to adhere to.

Choose the Right Sealing Option

There are various sealing options available, depending on the size and type of gap you are dealing with. The most common options are using caulk or weatherstripping. Caulk is suitable for smaller gaps and can be applied using a caulk gun, while weatherstripping is ideal for larger gaps and provides a more substantial barrier against air and moisture infiltration.

Apply the Sealant

Once you have chosen the appropriate sealing option, it’s time to apply the sealant. If using caulk, load the caulk gun and apply a continuous bead of caulk along the gap between the window and brick wall. Smooth the caulk using a paintbrush or a sealant finishing tool for a neat and professional finish.

If using weatherstripping, measure and cut the weatherstripping material to fit the length of the gap. Press the weatherstripping firmly into place, ensuring a tight seal between the window and brick wall.

Tips and Precautions

To ensure the longevity and effectiveness of the seal, consider the following tips and precautions:

  • Check the weather conditions before applying the sealant. Extreme temperatures or humidity can affect its performance.
  • Use a foam backer rod for larger gaps before applying caulk. This will provide additional support and prevent the sealant from sinking too deeply into the gap.
  • Double-check the compatibility of the sealant with your window and brick materials to avoid any unwanted reactions.
  • Allow the sealant to dry and cure completely before exposing it to water or extreme weather conditions.

FAQ: Common Questions about Sealing Gaps between Window and Brick Wall

  1. How often should the sealing be done? The frequency of sealing depends on various factors such as the quality of the previous seal, weather conditions, and the age of the building. It is recommended to inspect and reseal any noticeable gaps every 2-3 years.
  2. Can I seal the gap by myself or should I hire a professional? Sealing gaps between windows and brick walls can be a DIY project for those with basic handyman skills. However, if you are unsure or dealing with more complex issues, it’s advisable to seek professional assistance.
  3. What type of sealant is recommended for this purpose? Silicone-based caulk or weatherstripping made of durable materials such as EPDM rubber are commonly recommended for sealing gaps between windows and brick walls.
  4. How much does it cost to seal the gaps? The cost can vary depending on the size of the gaps, the type of sealant used, and whether you choose to hire a professional. On average, sealing gaps can cost anywhere from $50 to $200 per window.
  5. Is it necessary to seal all the gaps around windows or just the noticeable ones? While it’s essential to seal noticeable gaps, it’s recommended to inspect and seal all gaps around windows, as even small gaps can contribute to energy loss and other issues.


Sealing the gap between your window and brick wall is a straightforward yet vital task that can significantly improve the energy efficiency, comfort, and overall condition of your home. By following the step-by-step guide provided in this article, you can seal those gaps effectively and prevent air drafts, moisture penetration, and unwanted pests from entering your living space. Don’t wait any longer – take action and enjoy a more secure and comfortable home environment today.

Remember, expert guidance is just a click away. Visit How-To for more informative articles and helpful tips on various home improvement projects.


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