![]() A flat roof is prone to water damage due to its slope, and the underlayment plays an essential role in protecting it. UnderlaymentĪn underlayment is a protective roof covering installed on top of the insulation on the sheathing to prevent water from penetrating the roof interior. The one between the ceiling and roof sheathing can be any insulating material stuffed into the space and air conditioning vents. The insulation is made of materials with insulation properties such as iso-board. There are often two layers of insulation Insulation is meant to reduce the amount of heat gained or lost by a flat roof due to the close contact between the atmosphere and house interior. It makes roof installation easier by acting as the first complete cover. Roof decks are typically made using plywood, and it creates a surface on which one can walk. This is the interior covering part of the roof that seals the roof interior at the roof frames to be both protective and act as a complete surface for attachment of other roof covering material. The roof truss is a collection of beams connected and installed on the house frame to which the roof covering is attached. Rafters are lengths of wood placed on the truss from the eaves to the ridge of the roof or end to provide attachment points for the roof deck. Rafters can be connected at underpurlins and reinforced at the joints in case rafters are shorter than the roof slope. Underpurlins are lengths of wood installed under the roof rafters to hold them in place and increase their load support. Purlins are lengths of wood installed on the roof sheathing to provide attachment points for roofing tiles. The roof frame varies depending on the function and design of the roof This is the part of the roof responsible for maintaining its structure and shape. If any leaks, a brown circular or irregular patch will appear through the plasterboard ceiling, alerting the leaked owner. The ceiling also prevents any leakages from dripping into the house. It is held by cornice at the edges, which acts as a protective and aesthetic design. It is installed on the ceiling joists that run across the roof to provide attachment points. This is the visible part of the roof from the house’s interior. To understand the anatomy of a flat roof, we will look at parts of the common house roof, starting from the visible interior part to the visible exterior part of the roof. ![]() Anatomy of a Flat RoofĪ flat roof comprises many different parts assembled to perform its designed functions. Flat roofs are also used in buildings with rooftops or roof decks, but this article will discuss more. ![]() It is mainly used on sheds, porches, smaller houses, extension buildings, or houses with an intricate architectural design that incorporates multiple roof types. Most roofs have a degree of slope less than 10°-15° to allow runoff water to fall off the roof. This is an almost flat roof consisting of a roof frame and covering attached to the house frame. It is designed to perform different roles, which are looked at in this article. It can be constructed in various ways for functional and aesthetic reasons. A roof is the protective covering of a house.
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