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23 Cards in this Set
- Front
- Back
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What is the first line of defense against weather? / like what weather?
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ROOF/ precipitation sun an thermal transmission
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What are some advantages of a low slope roof?
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can cover large area/simpler geometry/roof can serve as other functions
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What are some disadvantages of a low slope roof?
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water drains slowly/slight movements tear membrane/water vapor pressure can blister membrane
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What are some requirements for the roof deck?
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support roof/resist uplift/sloped for drainage/smooth/
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below the deck/between the deck and membrane/above the membrane
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Thermal insilation
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____ is generally below the insulation, made from mopped felts
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Vapor retarder
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Adv of thermal insulation above membrane
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membrane protected from extreme temps/ membrane on warm side of insulation
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_____ is required to protect the Thermal insulation from sunlight
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Ballast
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What are the three types of roof membranes?
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built up roof/single ply/ fluid applied
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Multiple piles of asphalt-impregnated felt imbedded in bitumen. 1 felts laid in hot asphalt 2. overlapping layers 3.forms a laminated membrane
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Buiilt Up Roof Membrane
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Sheet materials that are applied to the roof in a single layer. Attached to roof: 1.adhesives 2. ballast weight 3.concealed fasteners
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single-ply roof membrane
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The Roof System
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uses rigid insulation over metal decking with a
thermalplastic membrane where the sheets are mechanically fastened to the structure and the seems welded |
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Membranes applied with a roller or spray gun and cure to form a rubbery membrane, uses: complex shapes that are difficult to roof by conventional means. (EX domes and shells)
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Fluid applied membranes
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What is Ballast material?
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stone aggregate and precast concrete blocks or pavers
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Ballast material purpose?
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hold down membrane/protect membrane from UV and phyisical wear
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These are installed over membranes for walks terraces drives etc.
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Traffic Decks
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Adv of steep roofs?
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can be inexpensive/ accomodate thermal expansion/ vents water vapor easily/ visible aesthetics
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What slopes are considered steep roofs?
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3:12 or greater
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What are the three general categories of steep roofs?
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thatch shingles and architectural sheet metal
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What is an ancient method of waterproofing usuing bundles of reeds and overlapping layers? and advgs?
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Thatch...shed water and provide some insulation value
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These are applied to the roof in small units iin overlapping layers with staggered vertical joints
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Shingles
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_____ can be made with wood asphalt slates clay tiles or conrete tiles
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Shingles
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What is used in Architectural sheet metal roofing?
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Sheets of steel, coatings, seams and fasteners
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