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K Rendering: the Ultimate Guide to K Rendering

Updated August 15, 2022
K Rendering: the Ultimate Guide to K Rendering

What is K rendering, and why are people interested in it? These questions today are some of the reasons why rendering has become a popular choice in the UK today.

Below, we explain all that is to know about what is K rendering, and its application.

Understanding K Rendering

What is K Rendering?

K-rendering is a type of render produced by Kilwaughter Corporation under the brand name K-rend. It offers various options in terms of color and texture, allowing for versatile and customizable finishes. K-rend can be applied manually or by machine.

K-Render Varieties

K-rend offers traditional mineral-based renders with a limestone treatment and organic resin renders known as "bucket mix." The latter is water-repellent, breathable, and low-maintenance due to the inclusion of silicone.

More read about What is K Rendering?

The Kilwaughter corporation is the owner of the brand name known as K-rend. Like other well-known brands such as Walkman and Hoover, its name is frequently used to refer to various renderings. However, K-rend has its very own distinct sorts as well as advantages.

So then, what is K rendering all about? K-rend is known for producing a rend with a substantial coat traditionally mineral-based and treated using limestone. You have access to over 500 distinct color and texture combinations when purchasing this product, allowing you to create virtually any appearance you desire. K-rend is delivered to the location in pre-bagged form. The K-rend pattern can be applied either by hand or by machine.

K-rend has also begun making organic resin renders, known as "bucket mix." These renders do not contain cement and come as a ready-to-mix paste. K-"bucket rend's mix" renders are also known as "bucket mix." This particular variety of K-rend contains silicone, which imparts the material with water-repellent, breathable, and exceptionally low-maintenance properties.

If you are rendering over anything other than bare brickwork, you will almost always need to apply a base coat before applying the K-rend. This is especially the case if you are rendering over a concrete surface. If you want to avoid the paint coming off or the house not having a suitable seal once it is rendered, you will need to remove the paint if your home is currently painted.

Even though K-rend does not fulfill the requirements for exterior wall insulation (EWI), it is possible to add this insulation to it if lowering your carbon footprint or the cost of your energy bills is a top priority.

Benefits of K Rendering

Here are some of the benefits of K rendering as they are essential in understanding what is K rendering about.

The benefits include:

  • Durability
  • Simple to Clean
  • Algae Resistant
  • Weather Proof


K-rend is designed to last for thirty years, which means that you won't have to repaint your house every three to five years. After the K-rend has been applied to the exterior of your home, you won't feel the need to do any additional decorating because you have such a wide variety of possibilities available to you in terms of colors and styles.

Simple to Clean

Additionally, K-rend is simple to clean up after use. It should be treated with algaecide once every year, and then the mixture should be washed away with your garden hose. The K-rend does not require a power washing at this time.

Algae Resistant

K-rend was explicitly developed to be resistant to the growth of algae. If you live in a coastal/rural region, it will be crucial to choose a finish that is algae-repellent because, contrary to common opinion, the likelihood of algae growth increases in environments with cleaner air.

Weather Proof

Although K-rend is impervious to the elements, it does allow water vapor to pass through it. In simple terms, this translates to excess moisture being able to escape from your home, allowing it to "breathe." It means you're less likely to struggle with condensation, which may make your house unpleasant and cause health problems if mold isn't treated correctly and allowed to develop unchecked.

Takeaway: The silicone technology allows water vapor to move freely through the render while significantly decreasing the quantity of water absorbed by the render's surface. This provides your property with the maximum level of breathability possible.

The water-repellent surface ensures that the surface will continue to have a recently rendered and visually pleasant appearance for an extended period. In addition, the finish is drier, making it more resistant to the formation of algae and easier for you to keep clean.

With you knowing what is K rendering and the benefits of apoplying K rend, you can proceed with learning about its applications

How to Apply K Rend

Applying K Rendering

How to Apply K Rend

Applying K-rend depends on various factors such as mix, what you are applying, and more.

You can read all instructions here, but we have provided three instructions below. This would bring you closer to understanding what is k rendering.

Application to Brickwork

Applying K-rend to brick walls involves preparing the surface, using beading for stops and corners, and applying base coats, followed by the K1 silicone K-rend. Proper mesh placement and scratching are essential for a successful application.

Application to Dense Blockwork

The process of applying K1 silicone K-rend to dense blockwork is similar to brickwork, with attention to surface preparation, base coats, and mesh placement.

Application to Lightweight Blockwork

Applying K-rend to lightweight blockwork may require the use of the K-Rend HPX basecoat, with a process similar to brickwork.

How to Apply K1 Silicone K-rend to Brickwork

The most frequent masonry building in the UK is a brick wall, and it is normal for brick wall owners to learn what is K rendering about so they can also apply this type of render. Using ornate brickwork to complete an outside wall is still prevalent. Some UK brick walls are over 100 years old, and some masonry weakens and lets in water. Water flowing through the wall might damage the property's plasterwork.

The K-Rend K1 silicone scraped finish is improved with silicone to prevent further brick damage from precipitation.

  • First, assess the wall to be repaired with K1 silicone K-Rend. Install 14mm-16mm beading for stops, corners, and drips on to-be-rendered walls. Spray foam may cause product performance concerns later on; therefore, apply a tiny amount of cementitious substance to hold the beads in place.
  • The substrate may need a fungicidal wash and primer. Substrate primers promote adhesion between the substrate (brick) and the render. They also manage brickwork moisture absorption, giving render/base coat time to cure. K-Rend R7 Acrylic Primer is recommended when applying K1 silicone K-rend to brick. This can be sprayed or rolled/brushed on.
  • We'll apply the K-Rend HP12 Base Coat when the R7 Acrylic Primer dries. K-most Rend's polymer-modified basecoat is HP12; we can use it for prep or undercoat.
  • Mix HP12 Base Coat with water according to the bag's instructions, and then we can render it. Use the spray machine's suggested water pressure settings. Applying HP12 6-8mm thick in one pass in this installation. The fibreglass mesh is cut and placed over the basecoat.
  • Make sure the HP12 Base Coat is dry before applying the scraped coat. Fiberglass mesh must be near the base coat surface. When embedding mesh, overlap each strip by 100mm. Use fiberglass mesh to reinforce windows, doors, and surface boxes. These should be applied in every corner at 45 degrees to the aperture and on top of the overlapping mesh strips.
  • What's the mesh's purpose now? It supports the render's structural integrity and provides a firm surface for the final K1 silicone scratch coat
  • When the mesh is in place, use a scarifier to scratch the HP12 base coat to create a key.
  • After 24-48 hours, apply the final K1 silicone scratch render.
  • Mix K-Rend K1 silicone scratch powder with water in a bucket for hand application. Follow the instructions on the bag and set the machine correctly—ready-to-use product.
  • Apply K1 silicone scratch render generously to obtain 10-12mm wall thickness. Using an I-bar or speed skim, flatten the surface's lines. The K1 silicone scratch render must be solid but not dry before we can go to the next following stage. Thus we recommend returning the next day to finish.
  • Using a scratch pad or scraped trowel, scrape 2mm from the K1 silicone render surface. Brush off dust.
  • In winter, the product may take longer to dry before scraping.

How to Apply K1 Silicone K-rend to Dense Blockwork

Silicone protects the K-Rend K1 silicone scraped finish from rain.

  • First, inspect the K1 silicone K-Rend repair wall. Stops, corners, and drips on to-be-rendered walls need 14mm-16mm beading.
  • Apply a modest cementitious substance to hold the beads in place if spray foam affects product performance.
  • A fungicidal wash and priming may be needed. Substrate primers increase render-to-brick adhesion. They control brickwork moisture absorption, allowing render/base coat to cure. K1 silicone K-rend on brick requires K-Rend R7 Acrylic Primer. Spray or roll/brush on.
  • Then we'll apply the K-Rend HP12 Base Coat. HP12 is K-most Rend's polymer-modified basecoat, used for prep or undercoat.
  • Mix HP12 Base Coat with water, then render it. Set the sprayer's water pressure. This installation uses 6-8mm HP12 in one pass. The base coat is covered with fiberglass mesh.
  • Before scraping, make sure the HP12 Base Coat is dry. The base coat must have fiberglass mesh. 100mm overlap mesh strips when embedding. Reinforce windows, doors, and boxes with fiberglass mesh. These should be applied 45 degrees to the aperture and over overlapping mesh strips.
  • Why use mesh now? It gives a hard surface for the final K1 silicone scratch coat.
  • Scarify the HP12 base coat to produce a key after installing the mesh.
  • Apply K1 silicone scratch render 24-48 hours later.
  • K-Rend K1 silicone scratch powder is hand-applied. Ready-to-use product; follow bag directions and set machine.
  • Apply 10-12mm of K1 silicone scratch render. Flatten lines with an I-bar or speed skim. Before proceeding, the K1 silicone scratch render must be solid but not dried. So, finish the next day.
  • Scratch or scrape 2mm from the K1 silicone render surface and dust.
  • In winter, scraping may take longer.
How to Apply K1 Silicone K-rend to Dense Blockwork

How to Apply K1 Silicone K-rend to Lightweight Blockwork

You can render lightweight blockwork or clay blocks, but you may need a different basecoat. We recommend the K-Rend HPX basecoat, but it's not always in stock. Check with us in-store or by phone for alternatives. Installation on typical brickwork is comparable.

Longevity of K Rendering

How Long Does K Render Last?

Just like we already explained above, K-rend, with its fascinating technology, is designed to last for thirty (30) years, and you do not need to repaint your house every five years if you use K-rend. All this is important to note when trying to understand what K rendering is all about.

How Long Does K Render Last


Understanding the Popularity of K Rendering

In recent years, K-rendering has seen a meteoric rise in popularity, and there is sound logic behind this trend and we offer this as a professional service. You should understand why, as we have explained what is k rendering in this post. The finish on K-rendered homes and buildings is sleek and sophisticated, and it features a dizzying array of color palettes and surface patterns. This finish also lasts for decades rather than just a few years because the color goes all the way through the render. It also makes your home more breathable and weather-resistant, both of which are obviously vital for the comfort you will experience in the long run.

Frequently Asked Questions (FAQs) about K Rendering

Yes, K-rend can be applied to various surfaces, including brickwork, dense blockwork, and lightweight blockwork. The specific basecoat and application method may vary depending on the surface type.

While K-rend doesn't fulfill the requirements for exterior wall insulation (EWI), it's possible to add insulation to it, helping improve energy efficiency and reduce energy bills.

The choice of K-rend variety depends on your specific project and design preferences. Traditional mineral-based K-rend or organic resin renders known as "bucket mix" are available, each with its unique advantages.

The cost of K Rend can vary depending on factors such as the type of K-render variety, the project's size, and location. Traditional mineral-based K-rend may be more cost-effective compared to organic resin renders.

K-rendering is designed to last for up to 30 years.

The coverage of a 25kg bag of K Rend can vary based on the thickness of the application and the surface type. Generally, it can cover an area of approximately 1 to 1.5 square meters at a thickness of 10-15mm.

Yes, you can K Rend over brickwork. Proper surface preparation, including the use of beading for stops, corners, and drips, is essential. The process involves applying base coats and the specific K-render variety, such as K1 silicone K-rend.


Richard Renderman, your trusted rendering expert at MidRender, is passionate about the art of rendering. With years of experience,he crafts…

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