DIY Home Improvement Forum banner
1 - 6 of 6 Posts

·
Registered
Joined
·
176 Posts
Discussion Starter · #1 ·
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 (http://www.diychatroom.com/f19/poly...od-sheathing-vapor-barriers-85846/#post529012) Which touched on a few related questions. :thumbsup:

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

Materials:
-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?
 

·
Super Moderator
Joined
·
12,627 Posts
I prefer option 2 but instead of Tyvek (or the like) I’d use #30 felt.
 

·
Registered
Joined
·
176 Posts
Discussion Starter · #3 ·
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.
 

·
Registered User
Joined
·
11,730 Posts
Read this and click on the yellow colored links: http://www.greenbuildingadvisor.com/blogs/dept/musings/where-does-housewrap-go

Follow advice here on windows and doors: http://docs.google.com/viewer?a=v&q...WO8aAe&sig=AHIEtbTHa3XRIv3GvYAMWrZBbBZoIUXgxw

And most of this: http://www.mtcc1170.com/images/BCRainScreen.pdf

Two layers even with vinyl: http://www.fortifiber.com/pdf/News_Info/Building Science Makes a Case for Two Layers.pdf

http://www.energy.wsu.edu/ftp-ep/pubs/building/project/importance.pdf

Fasteners leaks: http://www.google.com/url?sa=t&sour...sg=AFQjCNFUzTvRGq1GWFv4H951L4-bkv-Xgg&cad=rja

Other thoughts: http://docs.google.com/viewer?a=v&q...iZ9vwo&sig=AHIEtbRlhNBCWID8xGZ54EyM707m0gPdXQ

Flash windows on foam: http://apps1.eere.energy.gov/buildings/publications/pdfs/building_america/37583.pdf

The felt paper is better than housewrap under cedar that leaks tannins. Only better install would have been a rain-screen under the shingles: http://www.coastalcontractor.net/article/135.html

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

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

More on the polyiso, next time....

Gary
 
1 - 6 of 6 Posts
Top