All roof curbs should be a minimum of 200 mm 8 in above the finished roof and should be welded or sheet screwed to a metal wood or tectum deck or to the structural steel. Tectum iii tectum iiip composite roof deck solution with good sound absorption r values up to 44 and high humidity application performance. The tl tectum lightweight fastener system has many benefits you will find valuable when working with lightweight roof decks. 
				
			
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