Lecture 5-The Roof & Windows

Lecture 5-The Roof & Windows - Lecture Five Basic...

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Lecture Five The Roof Basic Terminology: 1) Roof: the entire covering assembly 2) Roofing: that part of the roof which is exposed to the elements. 3) Pitch: rise over run 4) Substrate: the decking that carries the roofing material. 5) Eaves: roof overhangs 6) Ridge: the peak of t wo or more roof slopes 7) Valley: an inverse ridge 8) Ceiling: the finish material attached to the underside of the roof.
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Basic types of roof designs: 1) Flat: must have a slight slope for drainage 2) Shed: a single slope 3) Gable: two slopes meeting at a ridge. Two walls extend up to the ridge. 4) Hip: two gables, a pyramid could be considered a hip roof. 5) Gambrel: four slopes in one direction, the typical barn roof. 6) Mansard: two gambrels. Basically is to the gambrel what the hip is to to gable. Roof structure: Depending on the different type of structural system, roof structure can include the following: a. Purlins b. Rafters (roof joists) c. Trusses d. Beams e. Girders
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Pitched roof design: 1) Determination of slope is based on the following factors: a. Type of roofing b. Presence of attic, or cathedral ceiling c. Cost d. Expected snow load 2) The basic design principle in the pitched roof is that by overlapping materials in the downslope direction, and by providing a waterproof surface, water will not sit, but will be forced to rub off the roofing surface.
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Flat roof design: 1) A roof is designated as flat id its slope is less than ten degrees. 2) Flat roofs have traditionally been used in hot climates where water accumulation is not a problem. 3) They were generally unkown in northern climated before the end of the last century. Advantages of flat roof design: 1) No space lost below roof, i.e. no dead space 2) Less material is used than in a sloped roof 3) The rooftop is potentially useful as a terrace, or sleeping porch 4) Potentially pleasing appearance 5) Easier to build than a sloped roof
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Lecture 5-The Roof & Windows - Lecture Five Basic...

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