Technology: Adhesive Bonding in Ventilated-cavity Facade Elements

© Fernando Río Durán
© Hufton + Crow/view/arturimages
For decades adhesive bonds have played a major role in the tooling and automotive industries, as well as in aeronautics. But does it make sense to use adhesives in facades? Large, high-profile projects employing adhesives are rare. For the Disney Concert Hall in Los Angeles, the structural calculations foresaw employing acrylic-foam tape to mount the 6100 stainless-steel panels (1.20 x 3.0 m), but, in the end, the weight of the facade was borne by clips. In the meantime, adhesives have been developed further, and when structural calculations and codes are met, they constitute a viable option. There are three types of adhesive systems: a. chemically curing; b. self-adhering; c. physical bond. The first two types are more prevalent in the construction industry. Chemically curing adhesives are viscous and react when the second component is introduced (e.g. the ambient humidity), to an elastic or solid material. Single- and multiple-component silicones and polyurethanes, as well as epoxy resins, belong to this group.