carpentry 1 - estimate residential floor systems
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with a 4 layer beam design the joint pattern in the first and second layers can be repeated for which layers?
3rd and 4th
how much extra sill material should be ordered?
one extra piece of the longest material
how many joists for 20'8" floor system?
- 20'8"= 20×12= 240+8=248"
- 248"÷16"0.C.= 15.5 SPACES
- 16 SPACES = 17 JOISTS
explain what to do when calculating joists with an offset?
for long section normal... spaces +1 =amount of joists. for short section it is spaces=joists amount. do not add 1
how do you calculate joists for floors with jogs?
- number of spaces minus 1 for joist total
- ex. 11 spaces =10 joists
when are extra joists required?
end walls parallel to joists, either side of large openings eg, stairwell, and may be required for internal walls parallel with floor joists.
how many pieces are in a bundle of cross bridging?
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