Timber floor thickness

Discussion in 'Builders' Talk' started by Golvannon, Jul 3, 2015.

  1. Golvannon

    Golvannon New Member

    I have successfully cut out my stairwell and sistered my joists etc, now I am thinking about the subfloor in my gite loft conversion...

    I have a length of 4.6m by about 7.5m and the joists are at 500mm centres and are 210 x 80mm and 4.6m long.

    There is very limited head room and would welcome suggestions about the thinnest safe thickness of flooring to use in this soon to be eaves bedroom please.

    I was hoping that 12mm ply or chip would be sufficient but my nagging doubts are telling me 18mm...

    Thanks!
     
  2. chippie244

    chippie244 Super Member

    18mm is the minimum for structural.
     
    Golvannon likes this.
  3. seen it all before

    seen it all before Active Member

    As above, nothing less than 18 mm for structural floors.
     
  4. malkie129

    malkie129 Screwfix Select

    I've never thought about it, but I boarded the centre section of my loft with shuttering ply from packing crates from work. It's only for storage & probably was about 16mm. :oops:
     
  5. chippie244

    chippie244 Super Member

    Ply pretty much always comes as 6mm, 9mm, 15mm, 18mm, 22mm and 25mm. You can get it thicker and thinner and in intermediate sizes for specialist uses. Even 18mm shuttering ply isn't rated as structural.
     
  6. malkie129

    malkie129 Screwfix Select

    No,but it's only for storage & it didn't cost. :D
     
  7. chippie244

    chippie244 Super Member

    Just don't go pogoing up there :)
     
  8. malkie129

    malkie129 Screwfix Select

    No danger of that Mate....In the loft, or anywhere else !!! LOL
     
  9. chippie244

    chippie244 Super Member

    I worked on a show once where an actor had to bang his stick, made from 2" dowel, onto a deck made of 18mm shuttering, four weeks in and he had punched a hole through the deck.
    He was a strong chap tho, he could do handstands off a vertical scaff bar.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice