Fixing shelf to solid wall

Discussion in 'Carpenters' Talk' started by Apophany, May 13, 2023.

  1. Apophany

    Apophany New Member

    Hi,

    I bought a shelf which I would like to fit to a solid wall in a Victorian property. The wall is the dividing wall between us and the neighbour, so I assume it's brick. From what I've read they tend to be about 225mm thick, so I should be safe to drill in to at least 100mm?

    The shelf is floating, and I've attached a picture of it. From what I understand it needs to be fixed on to a screw, or something similar and then will slide on to it? The opening is just under 10mm, so any screw head would need to be less than that.

    Can anyone recommend a fixing which would support the appropriate weight (we're thinking about 15kg-20kg) and would be small enough to fit in to the slot?

    I bought these: https://timco.co.uk/50050HF-nylon-hammer-fixing-pz-zinc

    But I need the screw to be fairly flush with the wall so the shelf doesnt protrude. I cant find any information about hammer fixings to see if its fine to screw it in past the thread so that only a small portion of the screw is actually protruding?

    Thanks!
     

    Attached Files:

  2. Rosso

    Rosso Screwfix Select

    Those will do just fine. Usually hammer fixings are fixed through the batten or whatever it is you want to attach, and bashed flush with the surface. Leaving a few mm hanging out won't be a problem, but you might have to countersink a bit to get all tge plastic part into the wall.
     
  3. Apophany

    Apophany New Member

    Will they be okay in this case where there's no batten and they're just being hammered directly in to the wall? Also any idea on how much weight it would be expected to support?
     
  4. Rosso

    Rosso Screwfix Select

    It depends in the integrity of your substrate, thickness of plaster, and hence penetration into substrate.
    In a decent substrate, these fixings will easily hold 10kg in shear, and withstand a pull of far more than 10kg.
    Whether or not they will work for you is entirely dependent on what you are fixing into.
     
  5. Jord86

    Jord86 Screwfix Select

    If the property is Victorian, then be very careful as the wall may only be 5-6 inches thick.
     
    Abrickie likes this.
  6. Jord86

    Jord86 Screwfix Select

    Plus, if your wall has original lime ash mortar then I wouldn’t use those hammer in fixings, look at frame fixings or normal brown plugs and regular woodscrews instead.
     
    arrow likes this.
  7. arrow

    arrow Screwfix Select

    As with jord, would use brown plugs and screws. They can also be adjusted better to get a nice tight fit on the keyhole brackets.
     
  8. big all

    big all Screwfix Select

    2 -3inch screws will be more than enough as all you have is what looks like 2x3mm/no4 screws so not much resistance there
     
  9. FlyByNight

    FlyByNight Screwfix Select


    Agree, the OP @Apophany needs to find out exactly how thick the wall is and the composition.
     
  10. Apophany

    Apophany New Member

    How would I go about doing that?
     
  11. Apophany

    Apophany New Member

    Yea happy to go with brown plugs instead. I wasn't really planning on drilling to 100mm, I just meant that I assumed that would be safe as an upper bound if it was necessary. However sounds like around 60mm would be fine. If that's the case can you suggest some screws/plugs that would be appropriate?

    It seems to me that generally the longer the plug/screw the larger the diameter it needs, and from what I understand normally the screw head is about twice the diameter of the screw thread. So I'm struggling to find fixings and screws that would be the appropriate depth but still have a round head that would be less than 8/9mm to fit the keyhole.
     
  12. big all

    big all Screwfix Select

    you need to know the keyhole slot size
    if its say 4.2mm its a 4mm or no8 imperial
    iff your using brown plugs then a 6mm/6.5mm/1/4" masonary drill bit
    drill a 50-55mm hole for the brown plugs 40mm+5-10mm below the surface then a4mmx45-50mm or a 1 3/4 -2" no8wire gauge screw
     
    Last edited: May 17, 2023
  13. Apophany

    Apophany New Member

    Not sure if you could see the picture I attached, but the keyhole slot is approx 9mm. So by my reckoning that means I need a screw of diameter roughly 4/4.5mm. Seems quite hard to find a 4mm diameter screw thats still 50/60mm long though with a round head. The only thing that I can see which is close on screwfix is these: https://www.screwfix.com/p/quicksilver-pz-double-countersunk-woodscrews-8ga-x-2-200-pack/15718, but theyre countersunk which wouldnt work well with the keyhole slot. Similarly difficult to find a plug that is that long that doesnt want a larger diameter screw to be used. For example the fischer duoplugs that are only 40mm long want an 8mm diameter screw
     
  14. big all

    big all Screwfix Select

    its the slot you go by
    a 4mm screw head will be double the shank so about 8mm
     
  15. Rosso

    Rosso Screwfix Select

    Fischer duoplugs require an 8mm hole. They will take 4/4.5/5mm screws.
    as for screws https://www.screwfix.com/p/quicksilver-pz-rounded-woodscrews-10ga-x-1-1-2-200-pack/19231
     
  16. big all

    big all Screwfix Select

    the heads off no 10s wont go in a 9mm hole
    as i say the two screws holding the keyhole plate look like perhaps no4 screws probably very short so long screws probably fairly pointless in the wall so 2"/50mm x4 or number 8 more than enough??


    no3 -- 4.77 --2.38
    no4 -- 5.48-- 2.74
    no5 -- 6.19-- 3.09
    no6 -- 6.60 --3.30
    no7 -- 7.62 --3.81
    no8 -- 8.33 --4.16
    no9 -- 9.04 --4.52
    no10 -9.75-- 4.87
    no11- 10.46- 5.23
     
    Last edited: May 18, 2023
  17. FlyByNight

    FlyByNight Screwfix Select

  18. Abbadon2001

    Abbadon2001 Screwfix Select

    id find a 2-3 inch screw, with a shaft that fits the slotted part with a tiny bit of clearance. sometimes using countersunk screws on these, instead of a pan head with a smaller shank, can give you some wiggle room to adjust how tight to the wall it is, and if you get a fraction off aligned get you out of jail for free....
     

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