Engawa
An or is an edging strip of non-tatami-matted flooring in Japanese architecture, usually wood or bamboo. The may run around the rooms, on the outside of the building, in which case they resemble a porch or sunroom. A similar structure in Korean architecture is the . Usually, the is outside the translucent paper , but inside the storm shutters (when they are not packed away). However, some run outside the . that cannot be enclosed by , or sufficiently sheltered by eaves, must be finished to withstand the Japanese climate. Modern architecture often encloses an with sheet glass. An allows  the building to remain open in the rain or sun, without getting too wet or hot, and allows flexible ventilation and sightlines. The area under an is sloped away from the building, and often paved, to carry the water away. The area directly outside the paving is usually a collector drain that takes water still further away. The is thus a way to bridge the obstacles good drainage puts between the indoors and the outdoors. Structure. The is supported on posts, identical to the other uprights of the house. A row of uprights runs long the inside of the , and  the sliding screens run between these; a second row of uprights runs along the outside of the . The posts traditionally stand on half-buried stones, pounded into the earth with a specialized maul, and the wood posts shaped to fit the upper surface. More recent houses may use concrete footings. The floor may not be finished, or it may be polished or lacquered. Terminology. means an edge; a side. The terms and were historically used interchangeably, but now generally refers to the veranda directly outside the shutters. Types of include: Positional terms. If there are fewer than three , an may  be described by more than one of the positional terms. Relation to other house components. The core of a traditional Shinden-style building was the innermost room or (see diagram). This was surrounded by the , which was on the same level, and was usually inside the windows and storm shutters. The was often a ring of tatami-floored rooms, but could be an unmatted ; see also . In a large building, there could be further layers of tatami-floored rooms, courtyards, and further floorplan complications. In Shoin-style buildings, the positioning of the varied more, and the storm shutters slid rather  than being hinged (usually horizontally). The modern Sukiya-style of building uses , storm shutters that not only slide but pack away in a cupboard called a by day; unlike the Shoin-style shutter, these generally run on the outside of the . The width of an varies with the building; is common, while large temples may have over of . The is supported on posts, identical to the other uprights of the house. The posts stand on half-buried stones or concrete footings. Cultural role. are often proportioned so that one can sit on the edge and observe the garden. They provide  a space for playing children and casual visitors. An is part of the house, and shoes are therefore not worn on it. Guests' shoes are lined up pointing outwards. While declined with the Westernization of Japanese architecture, they are making a comeback in modern architecture.