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Old 09-10-2009, 03:16 AM   #1
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Best way to seal sheet metal to wood


I'm doing a cold air return with the 20x20 duct transitioning to floor joist sections and drywall. I want to run a bead of something between the sheet metal and the wood of the floor joists. Should I use duct mastic for this? Regular silicone? Polyurethane? Latex caulk? Some kind of adhesive? joint compound?

What is standard for sealing this interface? It's cold air return so I don't have to worry too much about temperature differences.. But I don't want cracks to open up over time..

-Jeff

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Old 09-10-2009, 07:06 AM   #2
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Best way to seal sheet metal to wood


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Originally Posted by zootjeff View Post
I'm doing a cold air return with the 20x20 duct transitioning to floor joist sections and drywall. I want to run a bead of something between the sheet metal and the wood of the floor joists. Should I use duct mastic for this? Regular silicone? Polyurethane? Latex caulk? Some kind of adhesive? joint compound?

What is standard for sealing this interface? It's cold air return so I don't have to worry too much about temperature differences.. But I don't want cracks to open up over time..

-Jeff
Red RTV silicone

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