ssappington Posted October 1, 2017 Share Posted October 1, 2017 The new house has Silent Floor joists (TJI Pro 150) https://www.techsupport.weyerhaeuser.com/hc/en-us/article_attachments/200535130/TJI_Pro_150__250._350__550_-_February_1999.pdf I remember the old commercial had an elephant walking on them, and they appear to be rated high, but they look VERY flimsy! any engineers out there that can tell me how much the will hold? my 300 is a 2x8 footprint would run perpendicular with 4 joists under it my 120 is a 2x4 footprint on an exterior wall 1 Quote Link to comment Share on other sites More sharing options...
TheClark Posted October 1, 2017 Share Posted October 1, 2017 Interesting! Following... 1 Quote Link to comment Share on other sites More sharing options...
xmas_one Posted October 1, 2017 Share Posted October 1, 2017 I wouldn't trust it without at least scabbing it and pier or jack supports. Those joists are not engineered for the type of loading you are planning on putting on it. Code calls for 40 psf, with the 300g, you are getting close to 200psf. Quote Link to comment Share on other sites More sharing options...
Flash21 Posted October 1, 2017 Share Posted October 1, 2017 (edited) Pmd you Edited October 1, 2017 by Flash21 Quote Link to comment Share on other sites More sharing options...
badguitarist Posted October 1, 2017 Share Posted October 1, 2017 I agree with xmas one. Not an engineer but worked construction for a decade. It would be simple and cheap to add supports under the joists (assuming this is on the ground floor). Simplest way would be in the form of concrete piers and 4x posts. Or as he said jacks. shouldn't take more than an afternoon and would give peace of mind at the very least. 2 Quote Link to comment Share on other sites More sharing options...
ssappington Posted October 2, 2017 Author Share Posted October 2, 2017 Thanks for all the answers! will be reinforcing! Quote Link to comment Share on other sites More sharing options...
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