- 
								
								Certificate of Technology by The Korean Structural Engineers Association
							 
						
							- 
								
								Certificate of Excellent Product(EXTRA DECK)
							 
						
							- 
								
								Certificate of Floor Impact Sound Insulation Structure Performance(GL VOID SYSTEM I)
							 
						
							- 
								
								Certificate of Floor Impact Sound Insulation Structure Performance(GL VOID SYSTEM Ⅱ)