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What are the types of rafters?
There are basically seven different types of roof rafter designs used to create a roof: common, hip, hip jack, valley, valley jack, cripple jack and flying hip.
What are trusses vs rafters?
Trusses are prefabricated roof structures, whereas rafters are assembled on-site. Rafters cost more than trusses as their installation process is labor-intensive. Trusses are composed of multiple beams for added support. Rafters, on the other hand, contain two main beams to support the roof.
What are the roof rafters called?
A rafter is one of a series of sloped structural members such as wooden beams that extend from the ridge or hip to the wall plate, downslope perimeter or eave, and that are designed to support the roof shingles, roof deck and its associated loads. A pair of rafters is called a couple.
How far can a 2X6 Rafter span without support?
How Far Can a 2×6 Rafter Span? A 2×6 rafter can span 14 feet 8 inches when spaced 16 inches apart with No. 1-grade southern pine lumber on a roof with a 3/12 slope or less with a maximum live load of 20 pounds per square foot and a dead load of 15 psf.
Can you span 12 feet with a 2X6?
The maximum distance a 2×6 can span, according to the 2018 IRC, for a floor joist, is 12′-6”, ceiling joist 20′-8”, rafter 18′-0”, deck board 24”, deck joist 9′-11”, deck beam 8′-3”, and 6′-1” as for header. Always check the codes for determining factors or consult a Structural Engineer.
Which type of truss is the strongest?
I think the warren-truss design will be the strongest because it is the simplest design and spreads the weight of the load evenly over the bridge. Popsicle sticks and glue were used to build 3 different bridge designs: Pratt truss, Warren truss, and K truss. 5 identical models of each design were built.
What does a fly rafter do on a roof?
A fly rafter is attached to the overhang, blocking, and the sheathing of your roof. It’s used beyond the end rafter if needed. The fly rafter also helps keep the sheathing straight.
How big do roof rafters need to be?
Measure the size of your roof rafters and determine how big the fly rafters need to be. If the roof rafters are 2-by-10 inches, then the fly rafters will be 2-by-8; if the roof rafters are 2-by-8 then the fly rafters will be 2-by-6.
How big can a fly rafter board be?
The fly rafter can be a 1 by 8 board, a 2 by 6 board, a 2 by 8 board or a 2 by 10 board. They have all been done before and are not dependent on the other boards.
Which is the correct definition of a rafter?
A rafter in the projecting portion of a gabled roof. McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.