... in the design , produce ,installation ,etc of the steel structure building,we have our own Design Institute offering you ... your requirements and local conditions. Our advantages of our steel structure villa are as below : DesignAccording to client’s ... :2000 ,ISO14001:2004Main componentsH beam, Purlin ,sandwich panel, C purlin,Z purlin ,bolts and other fittings.Installation(1) Detailed instruction ...