Need Ceiling Joist help - Long Span
Pooh Bear
12 years ago
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Jon_dear
12 years agoPooh Bear
12 years agoRelated Discussions
Deflection in TJI joists over long span
Comments (6)The deflection or bounce of the I-Joists you describe is dependent not only on the joist depth and spacing but the size and strength of the top and bottom chords. To make it simple, you only have to ask the designer what "deflection limit" was used when the joists were sized (L/360, L/600, L/750, etc.) The manufacturers actually have different charts for each of these deflection limits so it is essentially the first decision the designer had to make. For this span, L/750 would give you a max. deflection of about 3/8" which would feel pretty stiff in my opinion. A limit of L/360 (the minimum required by code) would give you a max. deflection limit of about 7/8" which would feel pretty bouncy in my opinion. Not everyone agrees what deflection limit is acceptable for a given span but no one will ever say it's too stiff....See MoreHelp with double ceiling joist light install
Comments (12)Slip a 1/8" x 1" wide peice of metal long enough to span the joists. Dig out the back side of the wallboard to allow you to place the metal up tight to the joists without bumping the wallboard out. Drill a hole at an angle to screw into the joist that barely shows, then drill and screw into the opposite joist. Line up your pancake box, drill and nut and bolt the box to the 1" metal plate....See MoreFraming question: ceiling/floor joists
Comments (13)one more thought--if the concern is that the new supporting beam will sit too low in your remodeled area, you can do a 'hidden' beam. This involves building a temp wall on either side of where the beam will run, and then cutting each of the joists the width of what you are installing. You then push the new beam up into the slot you have created, post the ends, and then reattach each side of the cut joists to the new beam with joist hangers. It is more work, but it reduces (and sometimes eliminates) the drop down of the new beam. We did this last year in a high-end kitchen reno, and as if worked out, the sized beam(lvl) fit completely up into the ceiling plane, the new posts (to ground) disappeared into the dining room wall, and the owners had a fully open kitchen, with nothing to show that a wall was removed when we were done....See MoreNeed help w recessed lights - remodel lights vs putting in the joist?
Comments (5)That electrician was blowing smoke. Remodel cans don't cause the drywall to sag. It would be pointless to rip down the drywall to install "new contruction" cans. The only time to use those is in new construction or if you are removing the drywall for some other reason. Otherwise, it's just needless damage and work. Maybe he just doesn't like to be careful about damaging drywall or putting excessive holes in the walls/ceiling when running the wiring, so he uses this 'excuse' to justify his "bull in a china shop" technique....See Morelive_wire_oak
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