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The problem
Published in V. Charles Ward, Fire Safety Law, 2023
The term ‘cladding’ in this context refers to the components attached to the primary structure of a building to form non-structural external services, as opposed to buildings in which the external services are formed by structural elements, such as masonry walls. Aluminium composite material (ACM) parts had been used as a form of rainscreen cladding as part of a double-wall construction. Rainscreen prevents water ingress into the wall construction. Thermal insulation, air tightness and structural stability are provided by the second inner part of the wall construction. With ACM, two screens of aluminium are bonded to either side of a lightweight core of materials, such as polyethylene or a mineral core. During a fire, the parts can delaminate and expose the core material.
Ceramic materials
Published in Arthur Lyons, Materials for Architects and Builders, 2019
Rainscreen systems are appropriate for masonry, concrete, timber frame and concrete frame construction. A grid of vertical or horizontal aluminium extrusions is fixed to the façade, creating a minimum air gap of 25 mm. The rainscreen units are then clipped to the support system. The rainscreen cladding units may be manufactured in terracotta or from a wide range of other materials, including stone laminate, stainless steel, copper, aluminium or zinc. Rainscreen units are shaped to shed water out of the open-drained joints, and individual units may be removed for maintenance or repair. A range of colours and dimensions is available in terracotta units to create the required aesthetic effect. Terracotta rainscreen cladding (Fig. 8.11) is fire-resistant and durable, requiring virtually no maintenance except occasional cleaning.
Cladding
Published in Paul W. McMullin, Jonathan S. Price, Sarah Simchuk, Special Structural Topics, 2018
Justin W. Jacobs, Paul W. McMullin
Rainscreen cladding is becoming more popular, as new installation methods and materials are being developed. A rainscreen essentially opens up the exterior surface material to allow for pressure equalization between the backup air space and the external environment. Cladding is installed with open joints (see Figure 8.16) that are designed to shed the vast majority of rainwater, but allow air movement behind the cladding to promote ventilation. In contrast to traditional installation methods, where joints in the cladding between different tiles, panels, or bricks need to be filled to prevent the passage of moisture, there is no need for sealants in a rainscreen installation.
Paths of innovation and knowledge management in timber construction in North America: a focus on water control design strategies in CLT building enclosures
Published in Architectural Engineering and Design Management, 2020
Mariapaola Riggio, Noura Alhariri, Eric Hansen
The façade features a rainscreen with corrugated metal panel siding. High-density timber faced panels, manufactured with a core of paper fibers treated with thermosetting resins and protected by a weather-resistant exterior coating, are used as a secondary cladding between windows. Stained cedar wood fins and steel canopies deflect rainwater on the lower stories. The building was designed to include green walls within the recesses of the form, mimicking a wooden log that supports moss. To ensure the durability of this part of the façade, the plants used were selected to avoid intrusive rooting and are completely separated from the cladding using a stainless steel lattice system attached locally to the façade.
Seismic Testing of Glazing Systems and Proposed Design Tool
Published in Journal of Earthquake Engineering, 2022
David J. Edkins, Richard S. Henry, Rolando P. Orense
As far as demands imposed due to earthquake movement are concerned, the curtain wall systems are far superior to the rainscreens in that earthquake-induced deformations can be catered for in the split transoms, mullions, and stack joints, whereas this is not possible in the rainscreen system or full-height glazing systems. Based on experience in testing rainscreens to the AS/NZS 4284 seismic protocol, it is extremely difficult to get similar horizontal deformation movement than that achieved with the more flexible curtain wall systems, as the rainscreens fixing method locks up large areas of the wall, resulting in a rigid in-plane system.