end joint on MDF?

  1. steveo3002 Member

    Messages:
    5,003
    cambridge uk
    i want to join a bit of mdf in a T shape ....an upright /support leg for a long wardrobe shelf

    guessing nails or screws wouldnt be ideal into the end ?

    doesnt need to be massively strong once in place
     
  2. mtt.tr

    mtt.tr Member

    Messages:
    705
    Essex England
    Dowel joint
     
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  3. eLuSiVeMiTe

    eLuSiVeMiTe Forum Supporter

    Messages:
    8,239
    Location:
    Bedfordshire England
    Pilot hole is important in the board end to prevent splits. I've glued and screwed in the past. I've also drilled out afterwards and glued in dowels too.
     
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  4. Migmac

    Migmac Member

    Messages:
    3,137
    Location:
    Kintyre. Scotland
    I made a book shelf out of MDF, I used coarse threaded screws. Think I got them from screwfix
     
  5. Parm

    Parm I have fun doing stuff

    Messages:
    9,034
    Location:
    Towcester
    Biscuit joint if you have the technology

    Or counter sink and pilot drill for a screw. Smear of wood glue along the join.

    Surprisingly strong if you don’t manage to split the mdf

    Edit: to slow, Robin beat me to it
     
    Olderisbetter likes this.
  6. eLuSiVeMiTe

    eLuSiVeMiTe Forum Supporter

    Messages:
    8,239
    Location:
    Bedfordshire England
    If it's just supporting the shelf pilot screw and glue. No drama.

    Recommend buying some 18*6mm stripwood from wickes or similar to glue and pin over the edges before painting.
     
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  7. colnerov

    colnerov Member

    Messages:
    3,171
    Location:
    Nr Gatwick UK
    Biscuits are for alignment not strength, use dowels if you want more strength than glue and screw.
     
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  8. Parm

    Parm I have fun doing stuff

    Messages:
    9,034
    Location:
    Towcester
    I don’t know that
     
  9. steveo3002 Member

    Messages:
    5,003
    cambridge uk
    no biscuit machine /tools ...just drill /saws /screws and usual diy stuff

    think it needs the leg as its in a childs bedroom and im guessing it will get climbed on /sat on at some stage , will do some no nails or glue and a couple of carefully used screws i think
     
    eLuSiVeMiTe likes this.
  10. Parm

    Parm I have fun doing stuff

    Messages:
    9,034
    Location:
    Towcester

    Wood glue much better than no nails for the type of joint you want
     
    DAPPH likes this.
  11. DAPPH

    DAPPH Member

    Messages:
    1,811
    Location:
    Near to Cross Hands Llanelli SouthWales GB
    I have used 2.4 mtr lengths of planed 44 x 55 CLS as two bearers one back & front then placed the MDF shelf on top . The bearers sit on a cross CLS bearer screwed into the walls at each end .. the back bearer is also screwed into the back wall as these shelves are designed to take several hundred jars & bottles of preserved vegs , fruits & wine etcc. When she was 12 yrs old my daughter laid on the shelf when playing hide & seek

    That led me to construct all our built in wardrobes in a similar strong manner .
    In our bedroom the shelf runs a full 12 feet across the built in wardrobe there is a full MDF seperation wall the shelf barely rest onit . There is no need for a tee support in each side , which means I was also able to run a pair of stainless steel clothes rail across each six feet cavity, the top rail with a simple mid way single inverted pipe stand off screwed to the underside of the shelf to stop her ladyships clothes bending the rails . the lower rail for blouses & jumpers unsupported . My side of this big built in wardrobe only has a top rail under the shelf for my two suits ,a few shirts & trousers , we share it with my wife's two posh long frocks & several ladies out door jackets . On each end wall of the wardrobe there are also three 10 inch wide MDF fancy shelves screwed down on to batons screwed to the walls for things like hand bags & belts on her side and the steam iron & teeshirts & jumpers on mine .

    In the spare bed room one wardrobe is only 8 foot across shelf 600 wide ..no centre support . It has three such heavy /strong reinforced shelves . The main middle shelf has well over 150 kg on it.
     
  12. colnerov

    colnerov Member

    Messages:
    3,171
    Location:
    Nr Gatwick UK
     
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  13. eLuSiVeMiTe

    eLuSiVeMiTe Forum Supporter

    Messages:
    8,239
    Location:
    Bedfordshire England
    Now he needs to redo the test with pilot holes. Bet there's a difference.
     
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  14. mtt.tr

    mtt.tr Member

    Messages:
    705
    Essex England

    zinser 123 deals with the ends with just one coat
     
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  15. eLuSiVeMiTe

    eLuSiVeMiTe Forum Supporter

    Messages:
    8,239
    Location:
    Bedfordshire England
    Yes probably but I don't entertain decorating and have no faith in decorators to do a proper job and there job reflects badly on my job. For small bits I just run a smear of 2 part filler down the edge and a quick sand.
     
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  16. colnerov

    colnerov Member

    Messages:
    3,171
    Location:
    Nr Gatwick UK
    Hi, Here you go. It is pine and not MDF though.

     
  17. eLuSiVeMiTe

    eLuSiVeMiTe Forum Supporter

    Messages:
    8,239
    Location:
    Bedfordshire England
    Recon this blokes a bit simple tbh.

    You pilot or clearance on timber that's liable to split when a screw is driven in. Like a 1x1 pine.
    It's got naff all to do with strength.

    Pointless test in the center of a big flat board like that.
     
    Climber likes this.
  18. TechnicAl

    TechnicAl Member

    Messages:
    6,353
    Location:
    Rotherham
    I hate MDF, amost as much as Sterling Board.......awful stuff.......maybe with the exception of MDF skirting boards....you can bend them on dodgy walls......I know its more expensive but ply is so much better...
     
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  19. eLuSiVeMiTe

    eLuSiVeMiTe Forum Supporter

    Messages:
    8,239
    Location:
    Bedfordshire England
    I work with it regularly. Bet I hate it more.
    Serves a purpose though
     
  20. mike os

    mike os just a little insane.....

    Messages:
    5,761
    Location:
    North Wales
    Biscuits are for forming joints, not just alignment
     
    eLuSiVeMiTe likes this.
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