Blog
Blocking or x bracing to tighten up TJI floor? – GreenBuildingAdvisor
Join the leading community of building science experts
Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.
Replies
-
-
Expert Member At 25′ unfortunately l/360 will be bouncy no matter what you do. Blocking won’t do much and the x bracing needs to go in before the subfloor.
If there are interior walls, you can solidly connect those to the roof and the floor essentially building a giant truss. That will significantly reduce the bounce.
Other option is to laminate (glue and nail) a full length 2×6 to the bottom flange. This will effectively increase the I joist one size up which will make a big difference.
-
-
-
-
No offense, but you are really running out of options. I can think of no solution that is cheaper than a dozen more TJI’s would have been during construction
You need absolute clear span for every foot of space? No shelving lockers benches along the walls?
You need absolute clear span downstairs and upstairs?Sometimes one must give something to get something
-
If you must span 25 feet with the limited depth of 16 inches and can’t tolerate much deflection my guess is steel or concrete are your only options.
Were the plans reviewed by a structural engineer? Was deflection discussed with the engineer?
My guess is this is being built without any engineers input or maybe just enough to get the plans approved.
If by chance an engineer did put his stamp on your plan at least get his advice before adding stuff to his plan.
Walta