6 Steps to a Faster Economical Hambro® D500 Installation:
Installation is simple, but as with any simple thing, there are minimal precautions to follow in order to make it more efficient.
Spreading the Joists:
Bundles are placed on walls or beams and spread to approximately 4 feet o/c. With this greater joist spacing, the number of joists to be handled is reduced. A benefit in joist sorting, especially on tight sites where space is limited.
These secondary members are designed to support the forms, slab, and construction loads. When rotated and locked into slots in the top chord, Rollbars guarantee exact joist spacing while providing lateral and torsional stability. No permanent bridging or bracing is required. Bottom chords are fabricated with clips to accommodate a Rollbar for additional bracing as required.
Installing Plywood Forms:
The system reuses full sheets of standard ⅜ inch CDX grade plywood. Plywood is lapped and, together with the Rollbars, provides a secure platform during construction.
Mesh in Place:
Standard 8 foot x 20 foot sheets of mesh are easily placed over the top chords of Hambro joists. The mesh drapes and forms a natural catenary to reinforce and support the concrete slab.
Minimum 2-¾ inch, – 3,500 psi monolithic slab forms an acoustical seal where the slab passes over walls. The top chord protrudes into the slab for composite action, and serves as a guide for screeding.
Stripping the Formwork:
Rollbars and plywood may be stripped when the concrete reaches 500 psi, which is usually the day after the pour. The deck is ready for other trades when the concrete reaches a strength of 1,000 psi. The formwork is easily removed for future re-use.
Download the Installation Guide in Adobe Acrobat Reader PDF format.