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https://www.wisegeek.com/what-is-a-roof-joist.htm
Sep 24, 2019 · Roof supports which are angled are known as rafters. The network of joists connects to the rafters, distributing the weight of the roof to the beams the roof joists are attached to, and thus to the walls of the structure, which eventually connect with the foundation.
https://www.hunker.com/13417886/ways-to-add-extra-support-to-roof-trusses
The other is just used to support the trusses. A great deal depends on the pitch of the roof. A higher-pitched roof would be better for extra living space than a lower-pitched roof. Once again, a 2-by-4-inch piece of lumber is placed between the trusses and parallel to the ceiling joists. This is where a high-pitched roof is necessary.
https://www.roofingsuperstore.co.uk/blog/whats-the-difference-between-a-beam-and-a-joist/
Roof joists generally join opposing walls and support the ceiling below and/or the floor above. Joists are typically made of timber, and come in a variety of thicknesses and lengths depending on the specifications of the building. Steel, concrete and manufactured wood are also commonly used to create roof joists.
http://www.starktruss.com/wp-content/uploads/2014/02/APA-D710.pdf
I-Joist Construction Details Performance Rated I-Joists in Floor and Roof Framing ... Support back of I-joist web during nailing to prevent damage to web/flange connection. 2. Leave a 1/8-inch gap between top of filler block and bottom of top I-joist flange. 3. Filler block is required between joists …
https://www.hunker.com/13401776/how-far-apart-can-you-span-a-ceiling-joist
Ceiling joists are a critical element of a house's structure. They not only support the weight of the ceiling material, but also bear the outward pressure that is placed on exterior walls from the weight of the roof.
https://www.finehomebuilding.com/2011/02/09/how-to-reinforce-2x6-ceiling-joists-to-handle-heavy-loads
This scheme is predicated on achieving serious load carrying connections (well thought out and installed A-35 or L clips should to it) at all joints: tie to roof rafters at peak, tie to ceiling joists, roof rafters to ceiling joists at the eaves. The ceiling joists create a truss to begin with, I'm suggesting adding another member to the truss.
http://www.homeownersnetwork.com/booktopic/ceiling-joist-rafter-framing-details/
5. Design and support ridge, hip and valley rafters as beams, when the roof pitch is less than (<) 3/12. 6. Design and support the ridge as a beam and design the walls supporting the ridge board to bear the ridge board load, when framing cathedral and vaulted ceilings without ceiling joists and rafter ties. Purlins . 1.
https://www.mycarpentry.com/span-tables.html
The lengths and sizes of joists vary depending on the species and quality of the lumber used. For example, you can span a #1 grade (no knots) southern yellow pine a greater distance than a #2 grade (with knots) southern yellow pine.
https://www.shopyourway.com/questions/1005697
Roof joists are found on low-slope roofs (slope of 2 in 12 or less). Their functions are similar to rafters. Roof joists may span continuously from one side of the house to another or may be supported on an interior bearing wall. They may carry ceiling loads. Ceiling joists are horizontal members used with rafters and roof joists.
http://www.jwkhomeinspections.com/blog/collar-ties-rafter-ties-purlins-san-antonio-home-inspector.html
The braces (struts or kickers) should be within every 4' and should not be at a greater than a 45 degree angle towards the roof slope (lower side). In this image you can see the collar ties as required. Ceiling Joists serving as rafter ties are shown in both images. Purlins are present for rafter support.
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