| viachifonforn | Date: Суббота, 20-04-2013, 09:51:23 | Message # 1 |
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Group: Пасажыр
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Some modern roofing materials look like one of the traditional materials from the ground but are not the same. Examples are the large steel, aluminum, http://crawlers.hostzi.com or plastic panels that are colored and formed to the shape of wood shingles, tiles, or slates. http://rentaltech.comeze.com These panels interlock and are attached to the roof sheathing.
The type of roofing material, type of roof sheathing, and type of roof supports (rafters or trusses), are important notes for our preincident plan for any structure. If you do not have a preincident plan for the structure, assume that the roof is manufactured wood supported by http://buildtech.comeze.com trusses or I-joists and that the roof covering will be difficult to cut or break. In any case, vertical ventilation of most pitched roofs today is most safely done from an aerial ladder or platform, rather than from the roof or a roof ladder. Horizontal ventilation of attics and truss lofts by opening both gable ends is also an option.
Since we were in elementary school, public fire education programs informed us that closed doors are better than open doors in protecting firefighters from fire and from the products of combustion. http://granitt.site90.net Since we were in Firefighter I class, we have known that some doors are listed as fire-rated and need to be kept closed (or held open by a smoke-operated door holder) and that other doors are not fire-rated. http://stroika.comuf.com
The standard to which fire-rated door and frame assemblies are tested is National Fire Protection Association (NFPA) Station 252, Standard Methods of Fire Tests of Door Assemblies, 2012 edition (also referenced as UL 10B and formerly http://stroitel.comuv.com as ASTM E152 or ASTM E2074). The door and frame assemblies are rated according to the length of time they can withstand the furnace test within the test parameters. The fire door ratings under NFPA 252 (2012 edition) are 20 minutes, 30 minutes, ? hour, 1 hour, 1? hours, and 3 hours.
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