Columbia Twin Over Full Bunk Bed By, Atlantic Furniture The Columbia bunk bed features a classic Mission style design with subtle curves and solid post construction. Solid hardwood throughout with 26 steel reinforcement points. Choice of ladder included. We certify this bunk bed model has been tested by an independent laboratory and is in compliance with ASTM F-1428 Standard Consumer Safety Specification for Bunk Beds and the Government Code of Federal Regulations 1213 and 1513