![]() ![]() There is so much to consider about the materials that are ultimately selected for the roof or cladding of a project. Explore how metal panels can be used to create distinct architectural elements, such as curved roofs, perforated walls, mosaics, and continuous lines from the roof to the wall. ![]() List the specific credits in LEED v4 that a metal roof can contribute toward earning.Explain how a metal roof enhances solar panel performance and supports rainwater harvesting.Define what a cool roof is and how it impacts the efficiency of a building by managing solar radiation and minimizing the amount of heat that transfers through the roof and into the interior.Ice Dam Formed on Roof Edge: Photopro20 BY CC 3.Use the following learning objectives to focus your study while reading this month’s Continuing Education article.Īfter reading this article, you will be able to: How Snow Guards on Metal Roofs Prevent Snow Dumping The Science of Attic Ventilation in Residential Homes Valiant Exteriors recommends you find an experienced contractor because fitting rain and ice shields is a specialist task requiring extensive experience. Flashing eaves beneath tiles and sheets in this way can help prevent ice dams forming on lower roofs of heated buildings, and causing melt to find a way inside. This normally extends from the lowest point on the roof to two feet inside the outer barrier wall. These replace normal underlayment and comprise either (a) at least two layers of underlayment cemented together or (b) a self-adhering polymer modified bitumen sheet. The building codes provide for rain and ice shields in areas with a history of ice dams forming over eaves and causing water backup. How a Rain and Ice Shield Barrier Helps Prevent This The result is the same: high humidity in the roof with the possibility of moisture dripping onto the ceiling. It can then find its way through the overlapping tiles or sheets in much the same way as a driving rain might exploit them. When this happens, the melt flowing down the roof re-freezes over the colder eave surface.Īs a result, the water flowing down above dams up against the ice barrier. The roof above the eaves may remain frozen in daytime, while the sun causes ice melt higher up the roof. However, this can prove ineffective during extremely cold weather such as the recent polar vortex shifting south and causing air temperatures as low as -30C. This helps balance the outside roof temperature from the rooftop all the way down to the eaves troughs. The area under the roof is also largely shielded from icy blasts when wind gusts strongly.įitting vents to soffits under eaves encourages warm attic air to find its way through to outside. This is due to a combination of some warmth finding its way past attic insulation from the living space below. The air inside the roof space of a heated building is generally warmer than the atmosphere outside in winter. That’s because moisture can travel up the inside of the lower edge of the upper tile or sheet, and drip down into the roof space. However the system does not work as well if a gust of wind drives the water upwards. Hence the lower edge of an upper tile or sheet overlaps the top of the next tile or sheet to a necessary extent. Roofs are generally-speaking intended to control the flow of water traveling down the slope. ![]()
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