The MEGAjoist _TMproducts comprise solid timber flanges, and intermediate timber webs that are glued together which acts more like a timber beam than a truss, thus giving the completed floor system a more solid feel.

• Conventional framing practice can be applied to MEGAjoist TM installations: however, to get maximum benefit from using the MEGAjoist TM system, builders are strongly advised to take advantage of its unique features by adopting the following guidelines.
• To meet the requirements of the current National Constuction Code (NCC), all installation work must comply with AS 1684 – 2021 and where applicable with MEGAjoist TM installation guidelines and details.
• For details not covered in this manual please contact our registered structural engineer for further advice.

FLOOR LOADING: The MEGAjoists have been designed for the following Dead and Live Loads:

Dead Loads – are constant in magnitude and fixed in location throughout the lifetime of the structure. Floor dead loads used for the MEGAjoist system is 0.5 kPa. (50 kg/m²). For any loads greater than this (eg. Lightweight concrete floor panels etc.) please contact our registered structural engineer for advice.

Live Loads – are temporary loads due to furniture or people which may vary over time. Floor live loads adopted are either 1.5 kPa (suitable for domestic floors) or 3 kPa (suitable for most commercial floor applications).

MEGAjoist CENTERS – The span tables are based on the floor truss centres being a maximum of 450mm.

• Method of installation – proper installation is essential for reliable performance.
• Fixing of sheeting to joist – flooring must be nailed and glued to the top chords of the trusses.
• Floor joist centres – a maximum of 450mm centres should be adopted.
• Correct installation of strong backs – using batten screws in order to eliminate squeaking.
• Deflection of the sheeting material between joists can be reduced by decreasing the joist spacing or using a thicker and/ or stiffer floor sheeting
• Floor loading/spans – The correct span tables should be used

Care must be taken when the trusses are strapped down and transported to site.

The MEGAjoists can be laid flat nested in rows or stacked on top of each other, provided they are clear of ground and should not be left exposed to weather for extended periods of time without adequate protection.

Each truss should be inspected for damage prior to installation.

• The MEGAjoist products can be trimmed on site to a maximum of 10mm in accordance with the trimming details.

  Should the trusses require further trimming contact you MEGAjoist supplier for further advice.

DOCKING OF MEGAjoist PRODUCTS

• The MEGAjoist products can be specifically designed for limited onsite docking – please contact your MEGAjoist supplier for further advice.

  Under no circumstances should on site docking be undertaken without further advice.

Bottom chord ties 90 x 45 MGP10 as a minimum should be fixed to the bottom chord of the MEGArafters at no more than 5000mm max centres. Refer to the MEGArafter standard detail.

MEGArafter ROOF BRACING & TIE-DOWNS

Roof bracing should be installed in bays as close as 45 degrees as possible and in accordance with AS 1684.

Generally structural engineering drawings will show the bracing layout, alternatively the truss layout supplied will show the bracing plan.

The tie-downs used are proprietary products such as uni-grips etc. that should be installed as per the manufacturer’s recommendations.