H-6 Build Roof Systems Flashcards
What are the functions of a ceiling joist?
To tie rafter to support load and ceiling finishes to tie supporting walls together
Which type of roof creates the most tension in ceiling, joist low slope, roof or high slope roof
Low slope
What is the main difference between overhang and projection
Projection is horizontal, measurement, and overhang is length of rafter
What is a fly rafter
Very outermost, rafter, supported by outriggers
What is the unit run when using imperial system?
12 inches
What is the unit run when using the Fredericks Square?
250 mils
What is a working point
Measurement on rafter where cuts are laid out
What is the difference between the line length and run of a rafter
Line length is along rafters length run is equal to , is the horizontal distance
What is the difference between a ridge board and a ridge beam?
Ridgeboard to align commons, beams to be supported by roof joists
How wide must’ve working deck bee for a single pull scaffold built along the wall
Double 2 x 10
Why are rafters installed opposite each other in pairs
To keep bridgeboard true
What does the accuracy of waste factors depend?
Depends on the builder and his practises
Why is the ceiling Joyce cut 3/8 of an inch lower than the height of the rafters
So the ceiling joist don’t interfere with roof sheeting
Why must’ve registered engineer design ceiling openings that require more than one ceiling choice to be cut?
Due to complicated tension loads
How are the ceiling joist attached when supporting by a flush beam
Joist hangers and metal connecters across the top of the beam
Wire insulation requirements of concern for when designing the size of rafter
Not enough depth for insulation
What figures on the frame square used to lay out an angle cut on a gable stud
Rise and run “rise”
What figures on the framing Square are used to lay out the plum cut on a common raft
Rise
What figures on the framing square are used to lay out the seat, cut at the birds mouth for a common rafter
Run
What is the minimum size of seat cut allowed by the BC building code?
1 inch seat cut
What figures on the framing Square you used to layout slope cut on a collar tie
Run
What are two ways of framing in the gable end of a building
Supported by Gabel are notched into common
What is a sway brace
Brace to plum gable end
How was the ridge laid out?
Ceiling joist layout
What are age clips used for?
1/8 spacing
What types of roofing requires strapping?
Metal tile or slate
