Step 2 is to select the section and table that applies to your specific problem and carefully ensure the design assumptions and results tabulated align precisely with your situation. Step 1 is to be aware of the scope and limitations of the manual, and the applicability of the manual for your jurisdiction. The objective of this article is to introduce the reader to the scope of WFCM and provide guidance for starting to use the manual on a limited basis (such as the design of a single girder or header). Covering an intense two days (which some participants suggested should have been at least three days), the 91-page workbook for the course can still be downloaded and printed. Using the manual, the instructors led the participants through the design process assuming all of the load conditions contained within the IRC. A range of structural elements are covered, including sawn lumber, structural glued laminated timber, wood structural sheathing, I-joists, and trusses.ĭemonstrating its functionality as a design resource, in 2014, Virginia Tech offered a two-day program on how to use the WFCM to design the framing system of the two-story home depicted in Figure 1. The WFCM includes design and construction provisions for connections, wall systems, floor systems, and roof systems. Building code officials will also find the document valuable for plan review. The WFCM offers a pathway to accomplishing a code-conforming framing design for everyone from a layman to the most experienced residential designer, engineer, or architect. Is this allowable and why or why not? Again this is prescriptive.While the International Residential Code (IRC) gives the structural requirements and prescriptive design data for residential framing, additional help for the non-engineer is available through the Wood Frame Construction Manual for One- and Two-Family Dwellings ( WFCM) published by the American Wood Council (AWC). 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. 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. 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.
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