Building Con Ch.7 Flashcards
Heavy timber _ inches or more in smallest dimension
8
Chamfer
Cut corners off to retard combustion
Floor beams are
Joists
Osb size
Fairly constant width to length ratio
Lumber vs rough lumber
Lumber-wood sawn & planed
Rough- lumber left sawn 4 sides
Stud sizes
2x4
2x6
5 types wood frame buildings
Post and Frame Balloon Platform Plank and beam Truss
Post and frame key points
Identifiable frame/skeleton
Mortise and tendon joints
Walls not structural/load bearing
Balloon frame keynotes
Wall of ordinary studs nailed together
Universal method multi story to mid 20th century
Quick fire spread thru joist channels
platform frame keynotes
first floor a platform
subfloor on joists
no continuity from top to bottom limits fire spread
soffits
false spaces above cabinets connection between wall and joist spaces
sill
rot and insect decay resistant layer laid on foundation
spacing of floor joists
16 or 24 oc
bridging
cross bracing between joists keep upright and share the load
platform stud spaced
16 oc
vary the slope of the roof
hips and valleys
stairways framed using
stringers
stringers support
risers and treads
plank and beam keynotes
built with heavier beams
thick tongue/groove used flooring
reduced concealed space
plank and beam concern
fire in high open spaces can spread rapid and develop huge volume
lightweight trusses used since
1960s
two things used to create a longer piece of dimensional lumber (trusses)
finger joints and adhesives
dangers wood truss floors
high surface to weight ratio
gusset plate heating
no outward indication of presence
dangers truss roofs
lack ridge pole
can fall when exposed
