Challenges Associated with Installing External Corner Beads to Rendered Walls

Installing corner beads to rendered walls can be a tricky and time-consuming task, especially if one doesn’t know the proper techniques. Corner beads are an essential part of most exterior wall systems, as they create a neat finish around corners and edges.

Rendered walls provide an extra layer of protection for buildings against water damage and other environmental elements, but installing external corner beads on top of them can bring up some unique challenges that must be adapted to.

corner bead for external render corners

Understanding The Basics of Installing External Corner Beads

Before attempting to install external corner beads on rendered walls, it is important to understand the basics. First, determine what type of corner bead you need—for instance, there are specific types for inside and outside corners.

Corner beads come in either metal or plastic, each with their own set of benefits and drawbacks. Metal corner beads are generally more durable than plastic ones, but they require specialized tools to install correctly. Plastic corner beads are cheaper but can also be harder to fit properly due to their softness.

Next, consider the best type of wall render for this project. Wall renders typically come in two varieties: mineral and organic-based. Mineral renders are usually made from a combination of sand, cement, and other materials, while organic-based renders are composed primarily of synthetic resins such as acrylics and polymers.

Determining which type is right for your project will depend on the specifics at hand—for instance, mineral renders may be more suitable for high-humidity areas while organic-based renders may be better suited to hotter climates.


Preparing Surface and Applying Adhesive

Before installing external corner beads on rendered walls, it is important to prepare the surface properly. This includes cleaning the area with a mild detergent and water solution to remove any dirt and debris that could interfere with the installation process.

Once the wall has been adequately cleaned, apply an appropriate adhesive according to the manufacturer’s instructions. Make sure the adhesive is spread evenly so that each corner bead will adhere securely when installed.


Cutting Corner Beads to Size

Once you have prepared the surface and applied the adhesive, you can begin cutting the corner beads to size. This is a crucial step in the installation process, as corner beads that are cut too small or too large will not fit properly and could compromise the integrity of the wall system. When measuring and cutting your corner beads, be sure to add an extra 1/4-inch (0.6 cm) to each side for any trim that may need to be done later on.


Installing Corner Beads

Once your corner beads have been cut to size, you can begin installing them on your rendered wall. Start by pressing the first bead into place with steady pressure from both hands. Work slowly and carefully along each edge until all of the corner beads have been secured. Once the installation is complete, it is important to inspect the entire area for any gaps, cracks or other imperfections that could lead to water damage over time.


Finishing Touches and Maintenance

The last step in installing external corner beads on rendered walls is to finish the edges with a putty knife or similar tool. This helps create an invisible seal around each corner bead and prevents water from seeping into wall systems. Additionally, be sure to check your corner beads regularly and apply fresh coats of paint as needed in order to maintain their longevity.

Installing external corner beads on rendered walls can certainly present some challenges but following these instructions will ensure a neat, secure finish for years to come. Whether you’re a DIYer or a professional contractor, taking the time to understand the basics and preparing your surface properly will go a long way towards cultivating strong, stable walls that can stand up to the elements.



Installing external corner beads on rendered walls requires careful preparation and attention to detail in order to achieve quality results. From selecting the right materials and tools to measuring and cutting accurately, every step of this process is essential for ensuring that your walls remain secure and watertight over time.

With some patience and practice, however, you can successfully install corner beads on rendered walls with confidence—allowing you to enjoy the peace of mind that comes with having secure corners around your home.


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