Composite Joists

System “C” consists of load-bearing structural stud (braced) walls supporting a joist system consisting of a composite steel joist at
4’ ¼” oc., and a slender 3” concrete slab which is formed with reusable plywood forms. The floor system eliminates the need for
permanent metal decking. The floor system is manufactured by Canam Group under the trade name Hambro™.
This system provides great economy at spans of 20 to 35 feet and permits the most floor plan flexibility. Hambro requires no shoring and plywood forms can
be stripped the day following the pour, allowing for an accelerated building schedule.

Typical Details
Composite Joist Member, reusable 3/8” CDX plywood (installation only), Hambro Rollbars(installation only), 6×6 w2.9xw2.9 WWF, and 3” Normal
Weight Concrete

Sound Transmission
Hambro has an STC rating of 57 with bare concrete and no additives such as Batt Insulation. The Hambro assembly has an Impact Insulation Class (IIC) rating of 30 on bare concrete, similar to a solid 6 inch slab. Impact sound originates when one body strikes another, such as in the case of footsteps, hammering and objects falling. The IIC of any assembly is strongly dependent on the floor finishes and underlayment. Hambro’s IIC with pad and carpeting increases to 69. For LVT, tile, and hardwood flooring, you can achieve code with the introduction of an acoustical underlayment. Many flooring manufacturers will provide underlayment to uphold the warranty of their flooring product