How much can a 2x4 stud would hold lengthwise?

Discussion in 'Grow Room Design & Setup' started by MountainManGanjaGrower, Aug 4, 2011.

  1.  
    MountainManGanjaGrower

    MountainManGanjaGrower Active Member

    Hey I was wondering how many pounds a 2x4 stud would hold if it was positioned lenthwise on top of a grow setup.
  2.  
    Xcon

    Xcon Active Member

    Depends on how long it is. Problem with supporting weight with wood is that it needs to be reinforced. No matter what you're working with, be it plywood or otherwise, it will warp over time.

    You can support a lot of weight with 2x4s, but you've got to do it right.
  3.  
    MountainManGanjaGrower

    MountainManGanjaGrower Active Member

    Alright, It would just be one 600watt light system with a light mover and didn't know if I needed to add some more structure, but I think it's light enough that a 2''x4''x8' stud could hold it right?
  4.  
    BendBrewer

    BendBrewer Well-Known Member

    Can you mount in on edge instead of flat? That should give you some added strength.
  5.  
    Xcon

    Xcon Active Member

    I'd make an I-beam out of 3 2x4's and 2½" deck screws. Solid as fuck.
  6.  
    MountainManGanjaGrower

    MountainManGanjaGrower Active Member

    Yeah I was thinking about just putting it on it's edge but I don't know If I have enough room since it will be snug against the ceiling with my plans currently but there's always time for improvements.

    Hmm I know what an I beam is but I've only seen metal ones. With 2x4's would I attach the boards lengthwise with the two 4in side connecting to the middle boards 2'' sides?
  7.  
    Xcon

    Xcon Active Member

    2 boards horizontal on top and bottom, with a vertical board in between. 2½" screws along the length on both sides.

    [​IMG]
  8.  
    cruzer101

    cruzer101 Well-Known Member

    That is way overkill.
    You can span a 2x4 eight foot and the weight of the light/rail and mover will not effect it at all.
    We are only talking about 20-30lbs man.
  9.  
    MountainManGanjaGrower

    MountainManGanjaGrower Active Member

    alright it's good to have somone shine some light on this. I didn't think it would be a problem since I saw someone else doing it my way with only one 2x4, but they have a slightly different set up so i didn't know.

    OK, well I think I'm gonna go start building this thing with the original plan so there will be no hassle in having to wait another day or two for support issues that aren't really going to be that big of a deal, and I can FINALLY start to grow after a year and a half of planning and waiting.
  10.  
    sk'mo

    sk'mo Active Member

    The 2x4 should have a natural bend to it. You can see it by looking down the length of it. Place the wood so that that bend makes a natural arch. It'll give you a bit more strength and prevent sagging.

    That's not to say you need to keep a big 'wow' in the board. You can straighten it out. It's just a matter of deciding which side of the board to have facing down for the most support.

    If the light and rail are 20-30 lbs and the rail doesn't add any structural support, you'll want to anchor the 2x4 to the ceiling or provide some other extra support.
  11.  
    MountainManGanjaGrower

    MountainManGanjaGrower Active Member

    Well I highly doubt that it will weight more that 10-20 MAX i mean the Light mover maybe weighs a pound or two and the reflector weights about 2lbs and the lightbulb is maybe a quarter pound?

    Haha now that I look back after finding out the weight of my lighting fixture I wonder why i even asked this question haha
  12.  
    Xcon

    Xcon Active Member

    You can also span a 2x4 eight foot with zero weight and have it warp on it's own. I take it you have little experience with carpentry?
  13.  
    sk'mo

    sk'mo Active Member

    Which is why the way you place the board can have an impact.
  14.  
    Xcon

    Xcon Active Member

    I just like solid builds, no big deal. I've seen 2x4's warp in storage with no weight on them. Matter of fact, as soon as you pick boards from the pallets they begin to warp.
  15.  
    MountainManGanjaGrower

    MountainManGanjaGrower Active Member

    Yeah any wood i look at tends to be warped and its alright becauwe I plan to upgrade to a different room in a while so the wood only has to last a year or two on it.
  16.  
    woodsusa

    woodsusa Active Member

    Screw a strip of 3/8 plywood on each side, that will really stiffen it without adding a ton of weight.
  17.  
    WeeGogs

    WeeGogs Active Member

    wake up to the real world, timber is wet when cut down, it gets wetter when transported up and down river as floating logs, once it gets to the mill, it is machine cut to size and very heavy.
    it MUST be dried naturally to avoid warpage, this can take longer than the materials are needed.

    and a 10 foot long 4" x 2 " thick piece of dried timber placed between two solid columns dried out will easily support the average car engine on a chain.

    it will bend, it wont snap, it wont warp, warp is a natural process, bending is not.
    if it is allowed to warp through negligence the length of timber will twist like a corkscrew at the same time as it starts to bend with drying out too fast.

    if it is fixed between two sheets of timber, or plaster, or drywall, in a building it will not twist and bend in a million years, it will dry out and creak and that is all, although when damp or wet will blunt any decent sharp saw whether electric or hand.

    the heat in the building will dry it out totally with age too and its strength increases.
    take a damp twig and bend it, now take a dried twig, it is stronger and harder to bend but will snap if bent too far, it is also lighter.

    so there you have it.

    a piece of 4 x 2 will support huge weights if used alongside other 4 x 2, but...... if it gets too long and used alone it will bend like a banana if the weight exceeds the mass.
    but it will take a lot of punishment.
  18.  
    cruzer101

    cruzer101 Well-Known Member

    Yes as a matter of fact I have. I built my greenhouse for example. The other thing I have is common sense. Hes not building a house, its a temporary structure just to hold up a light. I agree a 2x4 can warp on its own, if it does, turn it over and mount it again, no big deal. I would recommend he put it on edge though don't mount to the flat side.

Share This Page