marknohr Posted March 8, 2017 Share Posted March 8, 2017 1st order is that I'm looking for a structural engineer licensed in CA. There is an unbelievable amount of building going on in the SF bay area so getting on anyone local's calendar has proven a challenge. 2nd order is to get some upfront guidance on expanding a room out onto an existing 4' cantilevered balcony. The plan is to double up the existing 2X10 16OC joists. I've heard 3:1 and 2:1 floor joist ratios as rules of thumb and want to be sure as this may impact the direction we take on the plans. Again, looking for a CA engineer to advise. Can anyone help me locate a resource for this? Link to comment Share on other sites More sharing options...
dssharp Posted March 8, 2017 Share Posted March 8, 2017 Rule is whatever is out, 2/3rds in. Referance ca 2013 codes. Ibc code and residential code. Check seismic zone . Check bearing points. Check load on platform. Link to comment Share on other sites More sharing options...
AndyGump Posted March 8, 2017 Share Posted March 8, 2017 If it is anywhere near the SF area then the seismic zone is D-sub-whatever, and if it is a balcony that means the second floor at least. If so then engineering is required and prescriptive is out. The engineer needs to design, calculate and stamp his/her structural plans. The balcony was probably designed for 50 lbs live load and if the room is a bedroom then the live load only needs to be 40 lbs. if I remember correctly (maybe 30 for bedroom and 40 for other rooms). Andy. Link to comment Share on other sites More sharing options...
Gawdzira Posted March 9, 2017 Share Posted March 9, 2017 The past code version had the cantilever at 2/3. The current is 1/4 without uplift justification. Link to comment Share on other sites More sharing options...
Francois Posted March 9, 2017 Share Posted March 9, 2017 I sent you a pm for engineer in SF Bay Area Link to comment Share on other sites More sharing options...
marknohr Posted March 13, 2017 Author Share Posted March 13, 2017 Thanks everyone for your comments Link to comment Share on other sites More sharing options...
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