... bolt.Then constructe steel joist with metal pendants,put into thermal insulation meterials,decorative stone meterials be fixed at the end. ... , just needs fix hardware based on architecture drawing,put thermal insulation adhesive mortar and fix HEIFS Composite Panel . We leave ... ,Pre-cast the steel plate , steel joist , Putting into thermal insulation . We need thickness of stone 10--15mm , not 25-- ...