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cloves 06-14-2011 10:32 PM

Housewrap/Drainage Plane Behind Fiberfaced Polyiso or in Front?
Hi everyone,

I am about to begin residing my house. I was wondering what everyone's input was on where the housewrap should go in this case. I had a previous topic with some great feedback located here ( Which touched on a few related questions. :thumbsup:

House is located in North NJ (zone 5-6 border).

-Framing is 2x4
-Fiberglass Batt Insulation R-13
-Polyiso 1.5" (fiberglass faced polyisocyanurate)(permeability <1.0) less than 1.0 according to the buildingscience article.

Design & Construction Option 1:
-Vinyl Siding
-Polyiso 1.5" (permeability <1.0)
-Housewrap (Tyvek or Dow)(Drainage Plane)
-1/2" Plywood
-2x4 Studs (Fiberglass Batt Insulation R13)

Design & Construction Option 2:
-Vinyl Siding
-Housewrap (Tyvek or Dow)(Drainage Plane)
-Polyiso 1.5" (permeability <1.0)
-1/2" Plywood
-2x4 Studs (Fiberglass Batt Insulation R13)

I am still a bit unsure of where the housewrap/drainage plane should be in my particular situation. Thoughts/comments?

kwikfishron 06-14-2011 10:44 PM

I prefer option 2 but instead of Tyvek (or the like) I’d use #30 felt.

cloves 06-15-2011 01:12 AM

Thanks for the reply kwikfishron,

I think #30 felt would def present breathability issues. My house is currently wrapped with #15, and in certain spots where I have pulled off the wood shingles, so I could reflash windows, I have seen spots where the water has hard time drying out after rainfalls.

cloves 06-20-2011 09:55 PM

Bump :)

Gary in WA 06-22-2011 11:08 PM

Read this and click on the yellow colored links:

Follow advice here on windows and doors:

And most of this:

Two layers even with vinyl:

Fasteners leaks:

Other thoughts:

Flash windows on foam:

The felt paper is better than housewrap under cedar that leaks tannins. Only better install would have been a rain-screen under the shingles:

You are using plywood sheathing, not Zip system or OSB......

Tyvek, not Typar........

More on the polyiso, next time....


cloves 06-29-2011 01:51 AM

GBR thanks I will read up all the links you posted and post back! Thanks!

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