ch8 vertical ventilation Flashcards
chains saws used for forcible entry or ventilation are usually equipped with blank chains to allow cutting through nails and light-gauge metal components
carbide tipped
if on scene resources permit, a burning building should be laddered?
on all sides
to observe certain constructions features and other signs that can warn firefighters of potentially unsafe conditions
read a roof
in general the strongest points of any roofs are?
directly over roof supports, at ridges or valleys, and where the roof meets the outside walls
whenever there is any doubt about the structural integrity of a roof, vertical ventilation operations must be limited to?
those that can be done from an aerial device or other position of safety
blank are normally square or rectangular metal-covered hatches that provide an exit from an attic or cockloft onto the roof and are often accessed from the top floor or the attic by a ladder
scuttle hatches
These structures often enclose the tops of stairways that terminate on the roof and they usually have a metal-clad door of standard size
penthouses(bulkheads)
some blank are thermoplastic units that are designed to melt out from the heat of a fire and thereby ventilate the building
skylights
blank vents are square or rectangular structures that penetrate the roofs of single-story or multistory buildings to provide additional natural light and/or ventilation
monitors
narrow, plastic attic vents that run the entire length of the ridge
ridge vents
the most common pitch in pitched roofs
5 in 12
in blank construction, the ceiling is often omitted and the rafters become part of the interior decor
post-and-beam
it’s A-frame configuration consists of rafters that run perpendicular to the ridge beam and down to and usually beyond the outside walls
Gable Roof
blank roof construction consists of a ridge beam with conventional rafters running perpendicular to the ridge and hipr rafters running from the ends of the ridge beam, at a compound angle of 45 degrees laterally, and some lesser vertical angle down to and beyond the outside walls at the corners
hip
this roof slopes down to meet every outside wall
hip roof
The blank roof consists of a high gabled roof with a vertical wall above a downward pitched shed roof section on either side
lantern roof
the blank roof can be seen as half of a standard gable roof or as a slightly pitched flat roof sloped from only one side-usually from the front of the building down to the back
shed
Shed style roofs may be constructed with blank which are more prone to early collapse
mono-pitch trusses
blank are heavy-duty trusses with sloping ends
bridge trusses
the blank roof has a double slope on each of its four sides
mansard roof
