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The ability to create cost-effective long span floors that can be quickly installed is said to have seen TJ joists used to create a large industrial mezzanine floor. A part of the iLevel engineered wood floor system, the joists are more commonly found in new build residential and light commercial developments. The 18m x 12.2m mezzanine floor has been installed to create additional production space at a Bristol joinery company. The original floor designs called for sawn timber but the architects opted for TJI joists because of their flexibility.