Roof Truss works including
- Type of Truss
The are many type or pattern of roof truss.Can search a lot from web sites regarding roof trusses.Most popular is roof truss pattern.
- Calculation and Drawing
Calculation and drawing will then produced when the material of roof truss and battern are decided.Last time timber is the most popular with the sisytem.The material of Zinklum and C channel are the most popular right now.The supplier will calculate and prepare a shop drawing and install the material at site.The common size or thickness is 1mm and 0.75mm.
- Method Of Statement
Before erection of truss,a method of statement for quality of material,fabrication,quality control of erection and connection will be submitted.
- Fabricated of Truss
There 2 type of fabrication.One at site and one at the factory.For Zinklum or Timber,factory fabrication is most popular and for a long span and metal truss ,site fabrication is most popular.The author did one desgn 60 m span for a Dewan truss from rectangular hollow section with 5 mm thickness.The problem is to cover inside hollow section with anti rust.Should be the hollow section dip to the liquid anti rust and cover the open end to protect from moisture.The welding process also the most important aspect to monitor.The hook position to lift up the truss is also check to avoid sagging to the truss.
- Installation of Truss
The hook position is very important to check to avoid unbalance and sagging to the truss.The temporary battern is install to control the level.The level of the truss is the main aspect to check and control.The spacing between it must follow as per drawing.
- Connection
Connection between chord or member of the truss must follow the drawing.The connection between truss to the beam is most important aspect to check and control at site.The are various type of connection follow what is the truss material.If timber,nailing connection,if metal,welding connection,if zinklum ,riveting connection.No of rivet is most important aspect to check and control.
- Installation of Battern
The final element of roof truss.Weather timber,metal or zinklum,the material of battern are follow the truss material.Connection between battern and top chord,spacing between them,level are the most aspect to check and control.
GONG BADAK ROOF FAILURE
- Poor workmanship and supervision
- Change of design for a long span
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