Flashcards in Chapter 8 Roofs Deck (30):
The weight of the bldg itself and anything permanently attached
45 degree angle
1 X 6
Used in hips or valleys to span between ridge board or wall plates
2 x4 or smaller
Any load other than a dead load
Transient and moving
People, snow, furniture
Open sheathing or skip sheathing
1 x4 or 1x6 are spaced out
4 to6" gaps
1 X 6" boards
8 Roof types
Common size for gusset plates
At what temps will the glue on mitered finger joints of LW trusses separate?
350 to 400 F
Where to look for clues on the rafter size?
Rear of building since it may not have soffits
Best indicator of LW truss?
2x4 exposed rafter tails
How much less is burn time of LW trusses?
Spacing for trussed rafters
On a hip roof, where two roof lines join
Gambrel roof design
The lower slope is steeper than the upper slope
Hazards of a Gambrel roof
What differentiates a Sawtooth roof construction?
Use of 2x8 rafters, with wood or metal for bracing
Flat roof with a pitch that exceeds 10 degrees
7 types of flat roofs
Wooden I joist
Metal gusset or glue
Open web bar
Nonstructural LW concrete
Most common flat roof?
Metal Gusset plate
What type of blade do you use to get through a flat non structural concrete roof?
Rotary saw with a carbide tipped wood blade or multi use blade
Or chainsaw with a carbide blade, but it will fuck it up
Note: book says multi use in summary
Main era for Bridge truss style roof?
Historical and Industrial
Identify an Arched truss/rigid truss/Rib Arch
Bottom chord sits on wall
On a bowstring, the top chord sits on the wall
Identify a Bowstring Truss
Top chord sits on wall
Vertical members are in compression
Diagonal members are in tension
Wauldbaum's center roof collapse was caused by:
Double rain roof
Concealed spaces in ceiling
Failure to recognize signs of weakening
How long can Timber Truss Roofs last in a fire?
30 minutes or more
4 factors that affect timber truss roof failure