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How can I join two 2'x4' pieces of treated wood like in the picture so that the screws are not visible? Or maybe it's possible not to use screws?

enter image description here

  • When screws are properly installed they are not visible. Do you mean you want to conceal the screw head? counter sink and plug hole. – Alaska Man Dec 8 '18 at 1:08
  • Not visible anywhere or just not on the outside? – HazardousGlitch Dec 8 '18 at 1:25
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    2x4s are not fine wood. Why would you want to conceal screw heads? But if you did, there are pocket screw joints that might work (ref Kreg Jigs). Alternatively you could screw from the outside into a recessed hole and cover the screw heads with dowels. – Jim Stewart Dec 8 '18 at 1:56
  • is that painted white, or just over-exposed? – Jasen Dec 8 '18 at 4:31
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There are a lot of ways you could go here.

Conceal The Screws

If you just make a simple butt joint like you have in your picture, you can do as @AlaskaMan says in the comments - countersink the screws and put a plug or putty over the screw head. That will hide the screw; the plug / putty will be visible but less noticeable than the screw.

Countersinking

Improved Screws

Pocket screws mentioned by @JimStewart in the comments are usually stronger than straight screws. The pilot holes are drilled at an angle and the screw is countersunk; you cut an oval shaped plug if you want to conceal the screws. You could insert the screws from the inside of the frame, depending on what you're making here, they may not be visible on that side, even without the plugs.

Pocket Screw Inside Corner

You could use corner brackets, which are very easy to use, and in some configurations pretty strong. If you can put them on one side of the assembly that's out of sight, they may not be visible.

Join without Screws

One sure way to make sure you don't see the fasteners is to not use fasteners. These methods are important enough that there's a name for it - the craft of joinery. You could write a book about it, in fact many books have been written about it - here's one:

Woodwork Joints: How They Are Set Out, How Made and Where Used. by William Fairham

There are far more joints in that book than I have ever seen in actual use. One of the simplest is a simple half lap corner joint. This one just about anyone could make with just a hand saw, and with good glue used correctly, it will be stronger than a screwed joint.

Halved Corner Joint

But the half lap as shown will be stronger on a joint where the pieces are flat, you get more glue surface that way. With the pieces standing, in the configuration in your photo, a slightly more difficult joint would be better, a bridle joint:

Fig. 78.—Bridle Joint at Corner of Frame

A mortise and tenon joint is similar, a little harder to make, but with less visible seam:

Fig. 134.—Joint for Inside Framing

There are many other variations and possibilities - box joints, doweling, biscuits, etc. etc. but hopefully this gives you some ideas.

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Simple, pre-drill with a drill bit slightly smaller than the screw into the top of the overlapping 2x4 so that the drill bit goes through the 1st 2x4, then into the 2nd 2x4. For screws, use 3 in. or 4 in. and screw them in until the heads recess into the wood. Had to do this plenty of times to re-stud my interior wall, and build a frame for a small addition.

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