The other issue with the hollow bars is that if enough weight was placed on a spot they would begin to bend. The issue became so bad that a 90 day warranty was put in place by most manufacturers of these frames. Another issue the black metal frames suffered from were bending stretcher bars or rails. Again the hollow nature of these strecther rails presented issues with breakage and bending.
It was soon discovered though that these frames were not such a bargain that they appeared to be. The first problem with black metal frames is the round metal bars that make up the seat and back sections of these frames. Where as wood futon frames are using flat slats, black metal frames have hollow round bars. Thinner mattresses would slide through the gaps between the round bars. On wood futons this was never a problem.
A lounge sofa can be placed next to a two-seat futon. Then, an end table can be placed in the corner, and a three seat futon can be placed at the long end of the room. This creates a sectional look out of individual pieces of furniture that are more functional separately than a traditional sectional. A futon bunk bed is a two-seat futon that is connected to a loft bed. This creates additional space for a dorm room or a childs room.
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