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RE: Vented composite decks

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This has been debated.   I know of no definitive testing except for Factory 
 Mutual, but the debate goes back some years ago when roofers were adhering 
 roof membranes to insulating concrete decks.  They blamed adhesion 
failures on the lack of venting.  The state of Florida has rules based on 
vented decks being required for lightweight insulating concrete roof decks.

>From my experience, I do not buy the argument.  I never have liked adhering 
 roofing to concrete on metal decks.  I prefer using the tabs mechanically 
fastened into the roofing and then adhering the tabs to the roofing 
membrane.  But you have to look at the roofing systems and what the 
manufacturer requires, or you can void a warranty.  Look at what is 
required for Factory Mutual and the roofing manufacturer.  That is the only 
 thing definitive.

Here are some web sites with a bit more discussion / bias.



Harold Sprague

> Date: Tue, 19 Nov 2013 10:15:09 -0800
> From: Tarekmokhtar(--nospam--at)
> Subject: [SEAINT-SEAOSC] Vented composite decks
> To: seaint-seaosc(--nospam--at)
> What are the advantages of vented vs non vented metal composite decks?
> --
> Tarek Mokhtar, SE

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