![]() ![]() Is this allowable and why or why not? Again this is prescriptive. Chapter 8 also provides requirements for the application of ceiling finishes, the proper ventilation of concealed spaces in roofs (for example, enclosed attics and rafter spaces), unvented attic. ![]() They will not be placing the ceiling joists at the top of the support walls, instead they will be raising the ceiling by placing the ceiling joists 24" up from the supporting walls tying into the rafters. Allowable span tables are provided to simplify the selection of rafter and ceiling joist size for wood roof framing and cold-formed steel framing. Below are helpful links to state and city building standards. Minimum footing size tables are revised to more accurately reflect current practice. As of January 1, 2023, the City of Sacramento is requiring all new plan review and permit applications to comply with the 2022 California Building Standards Codes and applicable City Code Amendments. USG offers construction professionals a range documents for use on ceiling and roof assemblies. For other grades and species and for other loading conditions, refer to the AWC ST JR. Component and cladding wind pressures in Table R301.2(2) are updated for new design wind speeds and hip or gable roof profiles. For ground snow loads other than those cited in Tables 802.5.1(3) through 802.5.1(8), spans for rafters may be determined using linear interpolation. They will use asphalt shingles and the total dead load will be 10psf. Ceiling joists shall be sized based on the joist spans in Tables R802.5.1(1) and R802.5.1(2). You are given plans for a home with a simple gable roof. I really hope this becomes a good topic of discussion and we all learn something from it.ĭisclaimer: This is not an actual situation that I or anyone I know currently has, this is hypothetical for discussion/education. If you are certified under the IRC with the ICC, you certainly should be able to.Ħ) If you say yes, please explain how you arrived at your answer. TABLE R802.5. This way everyone is in the same situation.ģ) We are looking at this from a structural standpoint for the size of a rafter only, energy, and other items not applicable.Ĥ) If you say no, please explain why and cite not only the code reference but how you determined it is not.ĥ) This is a prescriptive question, referring to an engineer/RDP is not an option. Sorry to be a bit rigid on this:ġ) Either you would approve it on the plans or you would not.Ģ) The question is as is, your local variations, if applicable are not relevant. There are some rules for this so that we ensure it is educational and don't get of topic. This is something at any code official would have to do when plans are submitted. I am proposing the anyone who is interested post whether or not you would approve this installation. I have, what I believe is the correct answer, but you never know. I want to try this out for fun and educational purposes. When using this method, the rafter spans must be adjusted downward, according to the formula at the bottom of Tables 802.5.1(1) to 802.5.1(8). ![]()
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