After I built the sunroom on my house in 1997, watching the sun come up in the window one afternoon I figured under that window would be a perfect spot to take a nap. So in 1998 I set out to build a suitable piece of napping furniture for that spot.
A couch would have worked just as well, but I really did not know how to make a couch, or at least not the cushions part of it. So I decided to build a daybed. I wanted this day to be suitable as a couch as well. To make it usable as a couch, I wanted the mattress to be narrower than a regular twin size bed, but where to find a narrow mattress? Asking at mattress stores proved fruitless.
Boyd Sleep Montana Upholstered Platform Bed Frame with Headboard: Linen, Grey, King
But eventually I found 'Waterloo bedding', which is sort of a factory outlet. They make mattresses for other companies. When I asked them what sizes did they have, they responded with 'what size do you want to make'. Puzzled, I asked further. The surcharge for nonstandard sizes was only 10%. Even with the surcharge, the price was still much less than from a mattress store! So I ordered a custom mattress for my daybed project. Lesson learned: Avoid mattress stores if you can!
Another alternative, that I had not thought of at the time would have been to buy a foam mattress, and cut it to size.
The design I came up with was one that allowed me to maximize the use of the Mortising machine which I had earlier that year.
So I decided that the ends and sides would consist of lots of vertical slats, each of which would be mortified into the rails above and below. The edges of the 1/2 "thick slats I rounded with a 1/4" router bit, so that the profile of the slat would fit into the elongated holes my mortising machine would cut with a 1/2 "router bit.
While I'm really happy with the result, I would not build it this way again. The problem with this approach is that when gluing the pieces together, especially for the back rail, all the slats have to be put into the holes with glue, and the frame pressed together at once. There's only so much time before the glue starts to set, and with 26 slats in the back rail, it was very difficult getting them all to line up and into their respective holes. I did work up to the sweat and pounding it pretty hard to get it together with the glue already starting to set.
A much better approach to doing slats like this is to just cut a dice in the edge of the wood, notch the slats are the ends of the slats are square, and put them in the slot, with blocks of wood in between to fill the spaces - see illustrations below. My daybed plans also use this approach.
The frame consists of two end pieces, with bed rail clips screwed into them, that the back rail and front rail simply hook into. This makes the whole thing really easy to disassemble. I used mortise to have joints to join the end pieces together. But strength is really that critical for this part, so doweling would work just as well.
I used bed rail clips to put the whole thing together, so the piece of furniture would be easy to disassemble and move.
The best place I know of to get these bed rail clips is the Home Depot. For the clip at the top, I needed a relatively short clip because the rail was not very wide. While clips of different sizes are available, I wanted one that very much matched the clips I was using for the rails at the bottom, just shorter. The solution I ended up going to buy the same size clips for the top, and then cutting them off with a hacksaw, so that the clip with two hooks turned into a clip with just one hook. I had to throw away the other half of each clip, because I wanted two screw holes in the part that I kept.
In a later bed project I just used screws at an angle to hold the frame together, very similar to pocket holes.
To make the daybed more suitable as a couch, I beveled the top rails outward slightly, as shown at left. This makes it more comfortable to lean against the top rail. Even with pillows piled against the back and sides of the bed, one still ends up leaning against the top rail quite often. I had to laminate two pieces of spruce lumber together to make the top rail thick enough that I could have it and still have enough left over for strength. I wanted the top rail to be a bit wider anyway, because the one on the back its fairly long, and I did not want to bow too much from being leaned against. Note that I did not do anything about beveling the post in any way. Its actually difficult to read in the corner to actually have the post touch your back, so its not an issue.
Note that because of the top back rail is thicker, and you have to be on the bottom rail - see image at right.
I put some pieces of oak down through the rails for the screws holding the bed rail clips to get a better hold (see image at left). I did this with the front and back rails, although, in retrospect, for the back rails this was completely unnecessary, as the wide spacing between the top bed rail clip and the bottom one prevents any sort of substantial leverage that might occur to pull on the bed rail clips. For the rail along the front though, I feel that this is quite important. If one leans against the side of the daybed (and I do remove often) there's a bit of leverage on the bed rail clip, so having the screws thread through the cross grain of the oak dowel really helps.
I used angle iron from an old steel frame to support the slats that support the mattress.
This was not part of my original plan. Originally, I just had a 1.5 "x1.5" piece of spruce screwed to the side of the rails near the bottom to support the slats. But once I put the mattress in the frame, I found that the top of the mattress came out higher than I wanted it - I had underestimated the thickness of the mattress with mattress pad on it. Really I should have made the rails wider, but it was too late on this frame. So I replaced the wooden rails with pieces of angle iron, which allowed me to rest the slats about 3 cm lower than before. In the daybed plans I drew afterwards, I made the rails a little wider, so this kludge would not be necessary.
To space the slats evenly, I nailed them onto some thin pieces of wood. As such, the slats come out in three sections. The image above shows one of the sections in place.
I built this daybed back in 1998, before digital cameras, and just before I had a website. Hence no original photos of the current construction. But I have been using this day for years now, and it has been with the test of time. I stack pillows against the sides and back of it, so it makes a nice couch.
I usually use it with my Wheely desk It makes for a very comfortable combination for using the computer.