Air And Thermal Barrier Behind Tub On Extrior Wall - Building & Construction - DIY Chatroom Home Improvement Forum
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Old 12-19-2009, 01:56 PM   #1
 
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Air and Thermal Barrier behind Tub on Extrior Wall


Attached are some pictures of an installation of a garden tub into a dormer. I need to air seal and insulate this situation and am not sure of the best way to do it. The soffits will let air in, but, unlike the rest of the attic, there is no place to continue the air path with Duravents. Should I build some canal for the air to be transferred out of the area to rejoin with air streams on the way to the ridge vent, or should I just block the whole thing off? What is the best practice? Thank you.





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Old 12-20-2009, 07:51 PM   #2
 
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any help is appreciated. thanks.
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Old 12-20-2009, 10:46 PM   #3
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Moved to building and Construction forum.

Maybe someone in hear can answer you.
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Old 12-21-2009, 06:10 AM   #4
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Well, the soffits are there to ventilate your attic and the dormer cuts that attic in two, so what you might just have to consider is blocking the attic off into two zones. So consider the walls around the tub as walls that need both air and vapour management by the appropriate placing of both insulation and vapour barrier.

Where do you live? that makes an impact on where to place those two last items, as you might just get cold spots in odd places that will promote condensation. So have an extra efficient fan to move any excess moisture outside and I'd be looking at R38 on the side walls and ceiling to make that area confortable.

For ease of access, I'd also be looking at spray-foam or isocyanurate panels in those corners to completely block off air and heat transfer in one shot.
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Old 12-21-2009, 08:09 AM   #5
 
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Thank you for your help. I live in the Lake Erie Islands.
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air seal , bath tub on exterior wall , dormer insulation , thermal barrier


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