File Storage Mezzanines often referred to as Catwalks or Record Storage Mezzanines are structures that are rack or shelving supported with walkways to access files easily. Mezzanines By Design fabricates, consults, engineers and installs all types of file storage structures. Mezzanines By Design is an AISC Certified Fabricator with over 25 years of file and record storage experience. Material Storage Systems, Inc. has worked with the largest record storage companies in the country designing, engineering, consulting and installing these types of systems. These systems maximize the storage density, reduce the amount of equipment needed and No matter how large or small the warehouse or storage area is; Mezzanines By Design can help you maximize the storage density in your warehouse with this type of system.