In its most basic form, an external render is a protective covering put to the exterior walls to prevent rain penetration. It also serves as a decorative finish to improve a building’s appearance.
So, if you want to spruce up the outside of your house with a coat of paint or a coating of render? There are many alternatives to pick from, including classic and monocouche renderings, acrylic, siloxane, and Polite paint. To choose the appropriate render or paint for your outside walls, follow our advice.
What exactly is render?
The three kinds of renders
- Cement render (sand + cement) is a type of render made from cement and sand.
- Render made of lime (sand, lime, and sometimes cement);
- The plaster finish.
Non-hydraulic lime sets slowly when exposed to air, but hydraulic lime sets quickly when exposed to water and then air.
- Because of their delayed drying time, lime-based renders are particularly easy to work with. They’re also great pesticides.
- Cement renders, on the other hand, have a longer life span.
Traditional or monocouche render
Render is typically made of cement or lime (or combining the two) and applied in three layers with a trowel.
- The initial bonding coat is thinly trowelled on and has a watery consistency.
- The second layer is a straightening coat, which gives the render depth and helps you to smooth out imperfections; it’s applied with afloat.
- A finishing coat is applied to the third layer for cosmetic considerations.
Your render’s appearance will, of course, be determined by the color you use and the texture provided by the components (such as sand). Traditional render is made on-site using a cement mixer and has a 50-100-year lifespan.
Monocouche renders lime and cement-based industrial render. It usually comes in a bag and is ready to use in the color of your choice. The Monocouche cause is popular because of its increased efficiency: it can cover an entire facade in less than three days. However, it cannot be applied over plaster or earth-based substrates like cob. It has a 50-year to 100-year lifespan.
Selecting the Proper Render for Your Surface
It’s critical to select the appropriate render for the surface you’ll be applying it to. In general, it should be softer and less waterproof than the surface it’ll be used to. In most cases, walls will be made of concrete blocks, concrete, or bricks. These materials are ideal for a very water-repellent industrial render with a thickness of 0.394-0.591 inches.
It’s best to use a professional render if applied over aerated concrete, insulating materials, or other low-strength substrates.
Which rendering finish should you go with?
Choosing a render also entails selecting a finish. Sprayed, crushed, scraped, and trowelled are the four primary varieties.
Finish with a spray can
This is a traditional render finish. Using a compressor hose or a Tyrolean gun, render is projected onto the substrate. A few hours after the initial application, a second coat is applied. Due to the roughness created by the rough surface, the facade will appear darker.
Finished with a crushed look
Render is sprayed on and then crushed with a trowel to get a crushed finish.
Finished with a scrape
The render is sprayed on and then scraped with a float or a scratch tool while it settles to provide a scraped effect.
Finish with a trowel
The render is smoothed with a plastic trowel or sponge for a trowel finish, giving it a smooth but grainy appearance.
‘Ready-made’ renderings are typically offered in 33.069 pounds tubs and require only dilution before use. These will typically cover 53.82 square feet in area and can be trowelled on or rolled on.
What exactly is an interior render?
A roller can be used to apply a variety of renders indoors. Interior render is typically made of acrylic resin and is used to decorate or refresh old surfaces. A unique honeycomb roller is recommended for application. Choose your grain size based on the desired result (the size of the small spikes or protrusions in your render finish will be determined by this).
What is the difference between the many types of exterior wall paint?
Waterproof exterior wall paint must allow the wall to breathe and let out water vapor. You can pick from the following types of color depending on the condition of the wall and its material:
Acrylic paints are simple to use, odorless, cost-effective, and rapid to apply (4-20 hours). They give excellent wall protection for 7-10 years, which is more than enough if your facade is in good shape. Water can be used to clean paint rollers and brushes.
A silicone-based resin is mixed with an acrylic resin in siloxane paints. They may be used on almost any surface. Siloxane paints are popular among painters because of their ease of application, durability, and matt appearance, resembling mineral paints. Water can be used to clean painting tools.
Pliolite and hydropliolite
Pliolite and hydropliolite paints are made of a rubber-based resin that is microporous and adheres nicely to most surfaces. Pliolites and hydropliolite colors are suitable for damaged, porous, or damp walls and have a 7-10 year lifespan. Polite paints can be removed with white spirit-type solvents. Similar to hydropliolite colors. However, they may be cleaned with water.
Paints made of minerals
Mineral paint, created from a base of either lime or silicate, is a somewhat old-fashioned alternative. These paints, which are bacteria-resistant and breathable, have recently regained favor.
Exterior wall paint by a professional
Your substrate and the location of your property are essential considerations when picking paint. You’ll need to choose a color that blends in with the surroundings.
Environments in the mountains
Because of the UV rays and cold temperatures, you’ll need to choose a paint that’s both robust and weather-resistant. Some siloxane paints are intended primarily for “adverse climatic circumstances” and even “difficult situations.”
Sand, salt, UV, and moisture exposure necessitate a unique type of protection, which is frequently provided by specialized “marine” siloxane paints.
Environments that are wet and forested
For facades exposed to high amounts of dampness, moss, and lichens, siloxane paints come in even more specialized types.
Other paints may be suitable, but the essential thing is to choose one well-suited to your environment (industrial settings, high-traffic locations, and so on!).
Final take on choosing your exterior wall render and paint
Municipal governments may govern exterior wall colors, more general restrictions, or, of course, housing developers and associations (if you live in a block of flats). Significant changes to the exterior of your home may necessitate obtaining planning permission. Here you can find the most up-to-date information on UK regulations.
Choosing a color or finish from a small color chart might be difficult. Instead, gather some photos of current facades with the colors or finishes you want to see to get a better concept of the final product. Even better, take a peek around your neighborhood for ideas!