![]() ![]() ![]() TABLE R802.4(1) CEILING JOIST SPANS FOR COMMON LUMBER SPECIES (Uninhabitable attics without storage, live load = 10 psf, L/Δ = 240) CEILING JOIST SPACING (inches)Ĭheck sources for availability of lumber in lengths greater than 20 feet. For other grades and species and for other loading conditions, refer to the AWC STJR. Spans for ceiling joists shall be in accordance with Tables R802.4(1) and R802.4(2). Collar ties shall be not less than 1 inch by 4 inches (25 mm by 102 mm) (nominal), spaced not more than 4 feet (1219 mm) on center. Collar ties or ridge straps to resist wind uplift shall be connected in the upper third of the atticspace in accordance with Table R602.3(1). Rafter ties shall be spaced not more than 4 feet (1219 mm) on center. Where ceiling joists or rafter ties are not provided, the ridge formed by these rafters shall be supported by a wall or girder designed in accordance with accepted engineering practice. Rafter ties shall be not less than 2 inches by 4 inches (51 mm by 102 mm) (nominal), installed in accordance with the connection requirements in Table R802.5.1(9), or connections of equivalent capacities shall be provided. Where ceiling joists are not parallel to rafters, subflooring or metal straps attached to the ends of the rafters shall be installed in a manner to provide a continuous tie across the building or rafter ties shall be installed. Where ceiling joists are not connected to the rafters at the top wall plate, joists connected higher in the atticshall be installed as rafter ties, or rafter ties shall be installed to provide a continuous tie. Ceiling joists shall be continuous or securely joined in accordance with Table R802.5.1(9) where they meet over interior partitions and are nailed to adjacent rafters to provide a continuous tie across the building where such joists are parallel to the rafters. Rafters are 2圆.Ceiling joists and rafters shall be nailed to each other in accordance with Table R802.5.1(9), and the rafter shall be nailed to the top wall plate in accordance with Table R602.3(1). The space below is the garage and master bedroom. Are these braces required? If they are, is there something else that can be done to provide the same bracing yet not take up near as much space? These braces basically destroy the ability to use the room because they run right down the middle of the usable space. There are some support braces in the room, but I do not know if they were temporary when building the house or required for support. I have attached some pictures so you can see. My main questions around this space have to do with some bracing that is in the middle of the room. There is also a 9'x9' 7' tall entry way that connects the attic to the rest of the house. Total measurements of the space from knee wall to knee wall are ~16' wide x 34' long. The ceiling heights in the attic measure right at 5' at the knee wall and a little over 9' in the center of the room. It has a full interior door into the space. The attic of my house has a tremendous amount of space and I think the original builder meant it as an unfinished addon room. I hope this is the right forum for this question. Hello, I'm a new member to this forum but I have browsed here periodically when looking at information regarding projects. How to build a shed roof, Shed roof construction, Shed roof design. I have attached a pic of what I am talking about. So what keeps the roof from collapsing or pushing out the walls? They all have an open design to provide more head room. From what I have seen none of these designs incorporate rafter or collar ties. I also found similar designs on the internet. I went to a few places around town and they all seem to use the same design. ![]() My confusion came up when I started looking at shed designs. Another option would be to use Trusses, which from all the ones I have found seem to have some sort of horizontal support that forms a triangle. ![]() Rafters connected to each other with collar ties and rafter ties. All rafters would then be running off the ridge board. A ridge board supported by posts going either to the floor or the supporting walls. I have a decent knowledge base when it comes to construction, framing, etc but I have never done a roof before.Īfter some research I have found that a typical roof should consist of one of these two designs. €‹I am currently planning to build a shed this summer and have run into a bit of confusion when it comes to the roof. ![]()
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