Thanks to this structure, an air cavity is created between the load bearing wall and the cladding material, allowing continuous ventilation. There usually is an insulation layer between the load bearing wall and the cladding, but it depends on the project. Sometimes the load bearing wall itself can be insulating or the insulating material can be placed inside the house. The load bearing wall must ensure the stability of the building.
This wall must be stable enough to support the weight of the cladding and the wind loads transmitted through the structure. This load bearing wall can be made of brick, concrete or wood, among other materials. The most important thing is making sure the wall supports the weight of the cladding material per m 2.
These openings must be correctly protected to prevent water filtrations, since water can diminish the efficiency of the insulating material. On the upper opening or top flashing, a metal profile is installed to prevent water to enter, leaving the necessary space to allow continuous ventilation.
This convection process makes the warm air lift during summer time, renewing the air inside the cavity with a cooler one. While during winter the air inside the cavity is not warm enough to lift, which helps the insulation layer contain the heat inside the building. This chimney effect avoids overheating during summer and helps maintaining a warm and steady interior temperature during winter. Therefore, constant air circulation from the outside to the inside of the cavity is essential to guarantee an optimal performance of the rainscreen cladding.
Since, as we can see, it is responsible of most of its advantages. Rainscreen systems mainly focus on insulation and moisture resistance properties. When the water ascertains a way to infiltrate the system, many problems may occur. Damp walls often lose thermal energy and lower the efficiency of the facility. Thus, every building requires a plan for installing a Rainscreen.
The most remarkable thing about these materials is that they are practical for refurbishments and new-build projects while being cost-effective and require lower maintenance. Installing a Rainscreen requires preliminary steps to ensure if the system is suitable for the particular projects.
It is essential to check with architects and local building codes before the procedure starting point. Following all construction codes that apply to the building zone is necessary.
Manufacturers always provide instruction for their products for different types of projects which is viral to follow. When the installation instruction differs from the standard codes, it is better to contact the contractor and check if it is still suitable to use Rainscreens for the purpose.
Here is the list of before-installation steps that can help individuals in their project management. The substrate must be plumb and square. The installer may use hard plastic shims between the vertical sub-framing and the wall surface if necessary.
The installer must properly layout sub-framing based on panel sizes, hole locations, and coordinate with hard reference points such as windows, doors, and corners. The installer will need to field measure and verify actual project conditions, and make any necessary changes prior to fabrication. Sub-framing anchors must engage in the intended support system, typically at 24 inches on center.
With a framed substructure, there are three design options: The vertical supports coincide with vertical framing members. There is horizontal blocking between the framing members. The sheathing has sufficient pull-out to support the installation of the vertical supports irrespective of the framing members e.
Exterior plywood. Start by installing the bottom vent strip and top closures. Note that the panels should not be used as roofing or in any position where they are in direct contact with ground moisture.
Also, vent space is required under window sill flashing and under coping. Lay out and fasten the vertical supports to coincide with the location where the panels are face-fixed to the vertical channels Fig. The vertical joints will appear totally open and water can readily penetrate between the panels much of which will be deflected by the channels before reaching the WPM.
The purpose of this closure is to minimize insect nesting and deflect water. The closure should be installed at all horizontal panel joints. Caution should be used at areas of discontinuity e. Expansion joints, anchor penetration points. Dissimilar load bearing wall assemblies will require a break in the sub-framing. Sub-framing components should be installed vertically and the installer must allow for independent thermal expansion and contraction. If cleaning the rainscreen inside and out is required:.
When a rainscreen design calls for a more specialized material, i. U-shaped channel glass , a competent glazier should be employed.
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