OpieRadio Logo
Compound Media Logo
Jim Norton Logo

Bounce In My Floor

Discussion in 'Wackbag Home Improvement & Car Repair' started by Special Eddie, Mar 6, 2012.

  1. Special Eddie

    Special Eddie I'M A VIOLENT EXTREMIST!

    Joined:
    Feb 28, 2005
    Messages:
    1,364
    Likes Received:
    4
    I have a bounce issue with my living room floor.
    My floor is a 20' x 12' Oak strip floor held up by 2" x 8" x 12' joists at 16" OC and I have full access underneath.

    What minimum size beam do I need to install down the middle with only 3 supports along the entire 20' run to get rid of the bounce? I would like the middle support to be 12' from one end.

    I'm thinking three or four - 2" x 8" with 1/2" plywood sandwiched, glued and nailed together should be good.

    Anybody know for sure?
     
  2. stevethrower

    stevethrower Got Sig?

    Joined:
    Dec 8, 2004
    Messages:
    47,961
    Likes Received:
    20,569
    Go down to your local building supply... tell them your conditions and they can size a beam/posts accordingly.

    I would think you should be able to get away with some LVL or similar....
     
  3. Special Eddie

    Special Eddie I'M A VIOLENT EXTREMIST!

    Joined:
    Feb 28, 2005
    Messages:
    1,364
    Likes Received:
    4
    Thanks, the LVL's start at 9.25" but I'm looking at no more than 7.25" deep.
    That's why I would Lam it myself, but I will check with the Lumber yard for options.

    edit - I found they do make 7.25" beams, I will look into cost now. - edit
     
  4. stevethrower

    stevethrower Got Sig?

    Joined:
    Dec 8, 2004
    Messages:
    47,961
    Likes Received:
    20,569
    If you are worried about height... you might be able to get away with sistering joists to your existing... if you are worried about height... a lot more work obviously.

    Also the LVL's you can get up 48'... so a 20' should not be an issue.

    And building supply like a lumber place not a home center... as they have computer programs that work with whatever companies LVL product they carry.
     
  5. Special Eddie

    Special Eddie I'M A VIOLENT EXTREMIST!

    Joined:
    Feb 28, 2005
    Messages:
    1,364
    Likes Received:
    4
    I did do the sistering but it had little effect on the bounce. Pissed me off.
    I'm thinking I should have glued a piece of 1/2" plywood between them before I nailed them together.
     
  6. stevethrower

    stevethrower Got Sig?

    Joined:
    Dec 8, 2004
    Messages:
    47,961
    Likes Received:
    20,569
    Is the plywood tight to the joists? If not go get some trim head screws... predrill and screw down from the top.
     
  7. MetalBender

    MetalBender I like fistables.

    Joined:
    Dec 20, 2009
    Messages:
    1,308
    Likes Received:
    111
    Sister 10's next to the eights. 8" is not floor joists. Simply cut a notch in the ends to set on foundation. Only lose 2" ceiling height and have floor properly supported. If you're putting posts under floor they need a footing under them and not just set on the floor.
     
  8. stevethrower

    stevethrower Got Sig?

    Joined:
    Dec 8, 2004
    Messages:
    47,961
    Likes Received:
    20,569
    If you are really concerned about height... I would prob put a steel beam in with a post in the middle with the appropriate footing under the post.
     
  9. CougarHunter

    CougarHunter Lying causes cat piss smell.

    Joined:
    Mar 2, 2006
    Messages:
    10,500
    Likes Received:
    2,527
    You need a triple 2x10 beam to carry a 12 foot span with 20 feet of width according to the beam span table.
     
  10. stevethrower

    stevethrower Got Sig?

    Joined:
    Dec 8, 2004
    Messages:
    47,961
    Likes Received:
    20,569
    He is worried about ceiling height in the basement... that is why I was suggesting some engineered product or steel.
     

Share This Page