Part 1
I have a floor made up of 2x10s 16″ O.C. Every other one is doubled up. The span of the floor is 17-18′. I do not know what species of wood it is. I have about a 3/4″ to 1″ sag in the floor. I am noticing this in the hardwood flooring. I have access to the floor from the basement. My first thought is to bolt 2 or more LVLs together to make a big beam and run it perpendicular to the floor. What size beams should I use and do I need footings?
Part 2
I just had a garage built and the attic floor was built using 14″ I-Joists. The span is 26′ with no support columns. The I-Joists are 16″ O.C. What would be the best way to remove some of the bounce from the floor? Thanks in advance for your comments.
JimS
Replies
Greetings Jim,
This post, in response to your question, will bump the thread through the 'recent discussion' listing again.
Perhaps it will catch someones attention that can help you with advice.
Cheers
Part 1 ... looks like your joists are spanning about 2 ft too much. A double 2x12 would work for the beam. Footings ... depends on how you plan to support the beam. Can you tie it into the foundation on each end? And put a coluimn at mid-span.
Part 2 ... Some bounce is normal, as is some deflection. The key is to keep it within acceptable limits. Is there a ceiling in the garage, or do you have full access to the underside of the joists? If you have the room, a column and beam under the joists would take out a lot of the bounce. The beam does not have to be centered, so you could place it so it doesn't impact your parking space.
What to use for a beam in the house depends on how much head room you can afford to lose and how often you can place the posts under it. Fast eddie hasn't adressed the span of the beam itself at all. If you are going with LVLs or a paralam, best choice IMO, the yard that sells can size things for you.
In the garage, running strapping on the bottom of the I-joists perpendicular to the joists at 16" OC can drastically reduce vibrations. Effectivness can be increased by making sure that you stagger the joints and jack a little crown into the joists first, to be elt out after nailing off all the strapping.
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