Casa Patio is the proposal for a single family residence home located in a suburban development in the western region of the island: Aguadilla, Puerto Rico. The typology of the patio house is reintroduced as a means of responding to a dense and cluttered environment in order to establish a direct relationship between architecture and nature. The new proposal further explores the use of the patio as a mechanism for the introduction of zenithal light and to ventilate interior spaces as well as an expansion device in order to resolve closed and dark existing spaces. The spatial sequence is defined by the continuous presence of the interior patios throughout, characterized by the discovery and encounter of different patio sizes, proportions and uses along the sequence. The main architectural element of the house features a steel plate skin that wraps around the front patio of the residence. Perceived as an orthogonal steel screen, it is composed of thin vertical plates varying only subtly in width and arrangement. Three basic dimensions of steel plates are spread through two layered planes of different arrangement. Even though the outermost layer spans the entire width of the skin, the interior layer is fragmented and spans only in a segmental fashion in order to densify the skin and allow for different levels of transparency. These are synchronized with the interior spaces so as to reveal or hide information, increasing or decreasing visibility to the exterior. Conceived as a shading device, the skin not only filters tropical light but it is thought of as an in between and habitable space, gaining the characteristics of an interior patio. This three dimensional quality of the space allows for various scenarios. On the one hand, this frontal patio allows for an extension of the living room and, on the other, it can serve as a buffer zone between the interior and exterior spaces with the function of a patio. The skin also functions as a protection device from local climate and foreign intrusion. The steel screen allows for protection of flying projectiles during a hurricane that would put in danger the glass surfaces of the glass wall behind. This new added skin allows for a major integration between inside and outside in a Caribbean climate without sacrificing practical considerations.