Chap 7 Sloping Peaked Roofs Collapse Flashcards
Gable roof
Has sides sloping up from 2 walls
The collapse hazards of sloping peaked roofs are
The roof structural framing
The roof deck
The slate or told roof shingles
Hip roof
Has sides sloping up from 4 walls
The gambrel roof
Has 2 slopes on each of two sides with a lower slope steeper than the upper slope
Mansard roof
Has 2 slopes on all four sides with a lower slope steeper than the upper slope
Collar beams are
Used to tie opposing sloping roof rafters together and help resist the outward thrust of the roof rafters at the eaves
Primary structural member
Primary structural member is a structure that supports another structural member whose collapse may lead to the failure part of the building
Wood floors the primary structural members are
Header and trimmer beams
In sloping roof s the primary structural members are
Ridge rafters
Hip rafters
Bearing walls
Flat roofs have two primary structural members
The two bearing walls
Gable roofs have 3 primary structural members
The 2 bearing walls and 1 ridge rafter
Hip roofs have 9 primary structural members
4 bearing walls
One ridge rafter
4 hip rafters
If structural supports on roofs. Are close together
A spongy feeling of the roof deck will indicate char or fire weakening
Roof or floor has structural members spaced several feet apart this will create a springboard effect
Which roof has the largest unsupported roof deck
Truss roof
The stability of a sloping truss roof depends upon
The number of purlins running perpendicular to the truss
Spacing of the trusses
