If it's not in The Code, It can't be allowed (prescriptively).Ĥ common rafters at 19' 9-9/16 (no ridge needed, drop 3/4" from 2 side commons to sandwich the first 2 mains) Please provide the code section that allows what you refer to as joist/cripples that will typically have a drywall ceiling attached to them to resist the rafters thrust (not sure if drywall can provide resistance), the size, type,quanity, spacing and connection details for your "stiff-back", and what table was used to determine that an approximately 14' Post/brace is an adequate brace.Ĭlick to expand.Let me first admit, I'm playing both sides of the net.Īs a Code Official, I completely agree with your statements above. Roof is symmetrical, add look-outs and a stiff-back, and you're all tied in. "Ceiling joist perpendicular to a center bearing wall if there is one, otherwise doesn't matter. ![]() As far as not being an engineer, you sort of just became one (not legally) because your explanation above cannot be found in any prescriptive building code. So per prescriptive requirements of a building code, the rafters must be tied at the plate connection (or close to it) with the ceiling joists and the perpendicular rafters must be tied with rafter ties located above the ceiling joists to form an effective and code compliant connection to resist the rafter thrust. This in turn "defies the gravity loads" that are on the roof system, that are increased when subject to snow loads. ![]() Most building codes require ceiling joist and/or rafter ties to provide resistance to the thrust reaction at the plate connection. The comment regarding the brace size and the ceiling joist location is a non-prescriptive response.
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