Consumer Products Safety Commission, Code of Federal Regulations, 1513.6 stipulates that:
        Instructions shall accompany each Bunk Bed set, and shall include the
        following information:
        
          
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            Mattress size must be shown. | 
          
          
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            On upper Bunk use only a mattress that is: Twin 38 x 74 inches
            Double/Full 53 x 74 inches (All Riddle Bunk Beds come with bed slats
            so a foundation unit is not required). | 
          
          
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            For Bunk Beds
            and Loft Beds manufactured by Riddle Manufacturing Inc. the mattress thickness must
            not exceed 9 inches, and the top surface of the mattress is at least 5
            inches below the upper edge of the guardrails, and is at least 5
            inches below the upper edge of end structures for more than 50 percent
            of the distance between the two posts of the end structure. | 
          
          
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            Do not allow children under 6 years of age to use the upper bunk. | 
          
          
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            Prohibit horse play on or under beds. | 
          
          
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            Prohibit more than 1 person on the upper bunk (our experience at
            Riddle Manufacturing Inc is that children will disregard such
            instructions and normal child exuberance will happen. All Riddle Full Bunk
            Beds have additional stiffeners to provide extra support for bed
            rails, and to give extra sway bracing the end structures). | 
          
          
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            Use ladder for entering or leaving upper bunk (All Riddle Bunk Beds
            are constructed so that the end frames are the ladder. A separate
            ladder for side access is available as an option). | 
          
          
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            If the Bunk Bed will be placed next to a wall, the guardrail that
            runs the full length of the bed should be placed against the wall to
            prevent entrapment between the bed and the wall. |