Walls – use bolts to attach a bed to the walls of the room


I plan on mounting my bed to the walls of my room. You can say that it will look like a loft bed without the legs. To make it look like it really is floating, I won't be using angle brackets. Instead, I plan on mounting the frame using multiple relatively long and thick bolts.

The bolts will go through the frames instead of under it like with brackets. The house is made of concrete so I'm pretty sure the walls can take the load of the bed, me, and lots more. The wood that will be used will be wood that is normally used for making beds so I'm pretty sure it can handle my weight too.

First Problem

My problem is if the bolts can withstand all the weight and transfer them to the wall. I will use thick enough and long enough bolts for these. How thick and how long exactly, I'm still not sure. Please look at the diagram below to see what I'm trying to say.

bed assembly

If you are wondering why I'm only bolting the bed on the short sides of the frame, that's because the back wall (which one of the long frames is touching) has a window in it (at best, I might be able to put a few more bolts near the corners). The bed frame is made using 1" x 4" pieces of wood. I also plan on making the frame capable of being disassembled.

Do you think this is feasible? If so, how long and thick should the bolts be? Is 3/8" thick enough? Is 4 inches long enough (I can get longer bolts if necessary)? What material should the bolt be made of? How many should I use?

Second problem

My next problem would be is that the walls of my room are not parallel with each other so a rectangular bed won't be touching the walls on both the short sides. See the diagram below to see what I'm saying:

bed diagram 2

As you can see, the left side of the bed isn't fully touching the wall. While I can still attach the frame to the wall, I don't like seeing any space in between. I think the space in between would be an inch or so at its widest.

First thing I've thought of doing is to just make the frame adapt to the shape of the room. Can anyone suggest a better solution to this as I would rather have a rectangular bed just so that I won't have an irregularly shaped bed when I move it or convert it to a regular one.

Another solution I've thought of is to make a wedge that will fit the space. I'm not sure though if that's an easy task (by the way, I will hire professionals to make the bed). Another is I can just make a small piece of wood to cover the front side of the space. This is easier than making a wedge but I don't think it's pretty to look at from below or over the bed.

What do you guys think?

Best Answer

As long as the wood that you use to construct your bed frame is strong enough in its own right to be used as a bed frame you should have no problems supporting the frame from both ends by bolting into the concrete wall.

Bolts that are 1/2" in diameter should be plenty strong in shear to support a bed frame mounted in this manner. Three or four equally spaced bolts per end would give you an even distribution of support for the frame at each of the concrete walls. If you can penetrate the walls by two to three inches and install good quality anchors there should be no problems with the bolts staying tight and in place. Using a drop-in internally threaded anchor type should provide you the ability to use standard threaded bolts that can then be removed easily with the anchor staying in place in the wall. If you look at the RM-12 type you'll need 5/8 inch holes in the wall that are a minimum of 2" deep. This type of anchor also includes the need of a setting tool to expand the anchor into the concrete before installing the threaded bolts. The RM-12 offers a 3/4" thread depth.

For best application of the bed frame it would be recommended to build it to fit to the shape of the walls so that the end pieces can be solidly bolted up to the wall. If you elect to stay with the rectangular frame and then I would recommend that backer be placed behind the end piece where each bolt is located. Obviously a wedge piece, as you surmised, would be the best as a full length backer. If you do go with just backer blocks or the wedge one way to get a nice look would be to add an additional facer trim board as shown below. If the gap out of square across the width of the bed is only 1" you will never notice it once you get a matress and bedding up on the deck.

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