Chapter 8 Roofs Flashcards
Dead load
The weight of the bldg itself and anything permanently attached
Diagonal sheathing
45 degree angle
1 X 6
After 1930
Jack rafter
Used in hips or valleys to span between ridge board or wall plates
LW truss
2 x4 or smaller
ELW
Live Load
Any load other than a dead load
Transient and moving
People, snow, furniture
Roof slope/pitch
Rise/run
Open sheathing or skip sheathing
1 x4 or 1x6 are spaced out
4 to6” gaps
Straight sheathing
90 degrees
1 X 6” boards
8 Roof types
Gable Gambrel Arch Bridge Truss Flat Hip Monitor Sawtooth
Common size for gusset plates
18 gauge
3/8” bite
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?
1/4th
Spacing for trussed rafters
24”