Construct floor joist and deck framing Flashcards
How is the clear span calculated?
By subtracting the sill plate, width and half the beam width from the total joist span
Determine the length of floor joists
Determine the joist span, which is half the length subtract the thickness of the joist header subtract three
Determine the number of joists required
Length of building divided by joist spacing plus one to start times two for the other side of the beam +2/4 stairwell plus partitions if joist embedded add 4
Cross bridge formula
Length of building times three times number of rows
Cross bridge. Bundle formula.
Number of pieces in a bundle divided by two
What is the difference between total span and clear span of a joist?
Clear spans to sell edge to beam edge. Total span is from outside header to centre beam
List three advantages of truss joints over the wood floor, Joist
More rigid floor system
Describe the nailing of floor joists to plate
Using 2 82 mm toenails
Explain two ways joists can be framed at the beam when they rest on top
Butted and lapped
Why are Joyce sometimes framed into the sides of the beam?
To gain more headroom
What are two acceptable methods of framing joists into the side of the beam?
Joist hangers and a ledger board
What is the minimum end bearing of floor joists?
38 mm to 1/2
When does a trimmer joist on the side of an opening have to be doubled
When the length of the header joist exceeds 80 mm
When does a header joist on the end of an opening have to be doubled
When length exceeds 1200 mm
How does a nonload bearing partition running parallel to the floor joist have to be supported
Joists under the wall
Loadbearing interior partitions at right angles to the floor joist Shelby located no more than___millimeters from joist support beam when the wall does not support the floor
900
The tail joist are spiked to the single header joist before the doubleheader joists are nailed on
True
What determines the size of a floor joist?
Loading span of joist spacing of the joist species of wood grade material, and type of bridging
Does the spacing of the floor joist affect the size of the joist?
Yes, it does
Holes drilled in floor joists she’ll not be larger than
 A quarter depth of member located, not less than 50 mm from edge
Floor joist maybe notched provided the notch is located at the top of the joist and then the proper location
True
The notch must not be deeper than___unless the depth of the joist is increased by the size of the notch
1/3
Where should the joints on multiple length of joist headers occur?
On the centre
What is the maximum amount of 2 x 8 floor Joyce that can be cantilevered if they support the roof load
Cantilevered floor, Joyce, that run it right angles to the main joist and support part of the roof load must extend into the floor system, at least__the cantilevered amount
Seven
Doubleheader joists are nail together by nails, not less than__inches long, and not more than__inches apart
76 mm or 3 inches and 300 mm or 12 inches
The clearance between a masonry, fireplace chimney and floor. Framing shall not be less than_inches for interior chimneys and_inches for exterior chimneys.
2 inches and half an inch
What are two primary reasons for using bridging?
Keep Joyce from twisting and reduce spring and bounce in the floor
Why should solid bridging be installed before floor sheathing is applied
To help space joists properly
Why is solid bridging sometimes used instead of cross bridging
 fill odd size spaces.
Why are the bottom ends of the cross bridging not nailed until the subfloor in partitions have been installed?
To allow joist to shrink
Joyce restraint must be provided at intervals between supports exceeding.__
2.1 m.
Blocking tightly fitted between joists, insecurely nailed, is acceptable for restraining joist twisting
Gypsum board attached directly to the joist can be considered equivalent to strapping
If the ceiling is furred or cloud with plywood, no additional restraint is required between supports
Stairwell rough opening length formula
Headroom plus floor construction divided by unit rise times unit run +5%
Straight run with a landing formula
Headroom plus floor construction divided by unit of rise times unit of Ron plus landing minus one unit of run +5%
Stairwell length for upper stairs, formula
Unit of runtimes number of treads of upper flight +3 inches for finishing plus width of the landing
