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Old 07-24-2010, 07:53 PM   #1
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Question about vinyl siding, tyvek and insulation


I was curious to try and find out the proper order for installing the following items. I have the exterior wall stripped down to the plywood. I have the interior down to the studs. I need to insulate the interior wall and maybe put plastic up as a vapor barrier on the inside. On the outside, I have installed tyvek on the plywood and foam board insulation over the top of that. Vinyl siding would be the last step.
Some concerns I've thought of recently are having too many moisture barriers. The home did have some moisture issues on this wall.
I suspect I'd skip the plastic on the inside and use regular insulation on the interior wall. On the exterior, I would have it layered as such: plywood, tyvek, fan fold insulation, siding.
Would this be correct?
thanks
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Old 07-24-2010, 09:10 PM   #2
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Don't skip the poly on the inside of the wall - you need it.

Tyvek is a moisture barrier, not a vapor barrier. Air can still move through it. You will still need a vapor barrier over the insulation/studs in the interior side of the room.
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Old 07-24-2010, 09:55 PM   #3
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and tape the seams of your foam
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