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Maximum Joist span for garage

  • 22-10-2010 10:16pm
    #1
    rustynutz
    Registered Users, Registered Users 2 Posts: 790 ✭✭✭


    Hi all, I'm thinking of building a garage, roughly 20'x40' with an upstairs in the attic space. My question is would 9x2 span the 20' across for the upstairs be ok or would I have to go heavier? also roughly any idea how much it would cost, cavity wall and sheet metal cladded roof.


Comments

  • #2
    gsxr1
    Closed Accounts Posts: 3,167 ✭✭✭gsxr1


    rustynutz wrote: »
    Hi all, I'm thinking of building a garage, roughly 20'x40' with an upstairs in the attic space. My question is would 9x2 span the 20' across for the upstairs be ok or would I have to go heavier? also roughly any idea how much it would cost, cavity wall and sheet metal cladded roof.

    I would suggest you get a professional to have a look at your plans, such as an engineer or architect as a 20' span may require more than 400 centers with 9x2s.
    Construction and planning forum lads would be better placed for such a question.


  • #3
    stapeler
    Registered Users, Registered Users 2 Posts: 1,086 ✭✭✭stapeler


    That's what I did 10yrs ago. 9" by 2" on 400mm centres. Still feels very solid.
    My garage is around 30 by 20 feet. Any cut-offs I used to make the stairs and work bench.
    No idea on costs.


  • #4
    gsxr1
    Closed Accounts Posts: 3,167 ✭✭✭gsxr1


    if it was mine . I would be aiming at 300 centers with one RSJ spanning across the center at 90 degrees to the joists..

    But I still would seek professional advise before proceeding .


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