Rafter ties shall not be spaced more than 4 feet o.c. Ridge boards shall be at least 1 inch nominal thickness with a depth not less than the cut end of the rafter. Rafters shall be framed to the ridge board or to each other with a gusset plate as a tie. Is this allowable and why or why not? Again this is prescriptive. Rafter spans shall comply with IRC Tables 802.5.11 through 802.5.58. Provide roof plan show rafter size and spacing, the type of valleys (true or over-framing), what is supporting upper ends of true valleys and what is supporting lower rafters supporting over-framing. ![]() Table R802.5.1 (2) Rafter Spans for Common Lumber Species. See footnote (a) on rafter span tables R 802.5.1(3)&(5). ![]() Table R802.5.1 (1) Rafter Spans for Common Lumber Species. 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. In table 802.5.1 of the 2010 CRC, Douglas Fir-larch is listed as SS, 1, 2, 3 and then right below that, (same table), Douglas fir-larch SS, 1, 2, etc. Spans for rafters shall be in accordance with Tables R802.5.1(1) through R802.5.1(8). 2020 Florida Building Code, Residential, 7th Edition - CHAPTER 8 ROOF-CEILING CONSTRUCTION - R802.5 Allowable rafter spans. They will use asphalt shingles and the total dead load will be 10psf. 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. Each manu-facturer shall publish the allowable maximum loads and spans for service as floor and roof sheathing for their treatment. 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. and spans, or both for untreated plywood design val-2010 FLORIDA BUILDING CODE RESIDENTIAL 8.1. ![]() 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. Permissible Clear Spans for Rafters (to BS 5268-7. 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.
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