What are Rainscreen Systems?
The cladding of a building can offer more than just aesthetic benefits. Rainscreen systems are a form of external cladding that protect the building from the full brunt of the weather and water damage. Rainscreen cladding works by creating a ventilation space or air gap between the exterior cladding panel and the moisture-resistant surface, moisture, and air barrier installed to the sheathing to protect the building envelope.
A Little Bit of History
Although rainscreen systems were first developed in Norway, Canada was quick to acknowledge their usefulness. One of the earliest mentions of rainscreens and their benefits can be found in a pamphlet entitled, ‘Rain Penetration and its Control’ published by the Canadian National Research Council in 1963. It states that the excess of water, primarily caused by rain, is one of the main factors behind the deterioration of walls or wall materials.
The rainscreen system has since been adopted worldwide and is now a standard practice in modern construction.
How do Rainscreen Systems Work?
A rainscreen system is an exterior wall detail that is designed to protect the building from moisture intrusion. Rainscreen systems are typically made of three main components which are the cladding, the air gap, and the moisture barrier. The cladding is the outermost layer of the rainscreen system. It blocks the rain and snow from penetrating toward your walls by deflecting it to the ground. The air gap allows for the drainage of any water that has entered. It also provides ventilation by creating an air flow, allowing cool dry air to enter from below pushing out warm, moist air from the top. This prevents water from settling into the walls along with other issues like mold growth. Finally, the moisture barrier, or the innermost layer, is a protective layer that prevents water from entering your building envelope.
Types of Rainscreen Systems
There are two main types of rainscreen systems, namely vented and pressure equalized systems.
- Vented Rainscreen Systems
These are the most common type of rainscreen systems. They use the natural convection of air and gravity to provide ventilation to prevent moisture build up and water drainage.
- Pressure Equalized Rainscreen Systems
These types of rainscreen systems are more complex. They include components like pressure-equalizing chambers that are designed to balance the air pressure along with vents and fans to equalize the pressure between the air gap and the outside environment to keep the building dry.
Benefits of Rainscreen Systems
Rainscreen systems offer plenty of benefits beyond screening a building from rain and snow. Some benefits include:
- Weather Protection:
The biggest benefit rainscreen systems provide is the protection from inclement weather. It stops damaging UV rays from harming your building and, of course, protects it from weather conditions like snow and hail.
- Improves Energy Efficiency
Apart from blocking water, the air pocket created by installing rainscreen systems helps improve the energy efficiency of your property. It acts as an insulating layer, reducing the amount of heat lost in the colder months. Simply, think of it as an additional layer (or sweater) for your building. This means that you can save money on your energy bills.
- Sound Absorption
If your property is located in a busy area, you’re sure to love this benefit. Rainscreen systems can block up to 10db of sound.
- Create Healthier Indoor Environments
Moisture can create several problems including inducing the growth of mold. Mold can create several health issues as the spores travel through the air. Rainscreen systems prevent the build up of moisture, thus preventing the growth of mold, improving air quality.
- Enhances Structural Durability
Although rainscreen systems do not add structural support, they protect your building against structural damage and corrosion, extending your building’s lifespan.
- Aesthetics
Rainscreen systems come in a variety of materials that can be used to create the aesthetic you want for your building’s façade.
Materials Used in Rainscreen Systems
Rainscreen systems come in diverse materials including:
- Wood
Wood finishes like cedar, redwood, and cypress are popular choices for cladding because of their natural beauty, durability and resistance to pests.
- Metal
Aluminum and copper sidings are popular as they are low maintenance and durable.
- Fiber Cement
Fiber cement is a composite material popularly used for it’s fire-resistant properties.
- High-Pressure Laminates
Lightweight, and durable, high-pressure laminates are made from layers of paper or fabric that are impregnated with resin and bonded together.
Rainscreen systems are complex systems and are best installed by experts. Maison Exteriors can provide the expertise you need. Call today for a free appraisal.