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Old 04-11-2012, 08:41 AM   #1
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XPS foam exterior


my house right now has no exterior drainage plain... its only 15yrs old and of course the OSB sheathing is starting to rot...

this is going to need fixed in the next year or two so I need some help planning this out..

We have R-19 insulated 2x6 stud walls, which is sheathed with OSB. I think its 1/2"OSB.

I want to try to stop thermal briding where possible, and was thinking of doing XPS on the outside as a thermal break.. what is suggested? i dont want it to look bad by pushing it out 4" or something outragious... I know R-5 is the bare minimum.. Is it ok to just go with 1" XPS or should it really be 2"? I'm in western pennsylvania not far from pittsburgh... we use to be growing region 5A now I think we switched to region 6

even if we foam it, should it still be house wrapped with tyvek wrap or similar?

now if i add say 2" of foam, how do you mount the windows? we have the type that nail up from outside (they are all gorell windows) do you somehow build it out, how do you deal with that situation?

now to make it more complex... I like hardbacked vinyal since its more durrable having the foam, i know its not a good insulator, but for making the vinyal more durable it seems nice... would it interfear with having the xps foam? thanks

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Old 04-11-2012, 10:11 AM   #2
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XPS foam exterior


For my area the standard is 2" foam on the outside for renovations.
For the windows we use a 2x4 (1&1/2" thick) and a strip of 1/2" plywood and build a frame around the window opening to bring it out flush. This allows the fin on the window to be nailed on and the J for the vinyl. YOu will need to add a 2" extension to your window jambs on the inside, or order them with wide enough jambs.
An Alternate way is to put a 2" brick mould around your windows then your windows have a sunk n look, have seen it done and it looked OK also seen it done and windows looked bad.
Many also use 2x4 and Plywood strip across the bottom for your starter and some use the same at the top for the aluminium soffit channel and up the corners for the corner posts (make sure it is wide enough or spaced so it actually catches the nail holes on the vinyl siding fin. (I did not do the corners as I did not want to lose the insulation in an already poorly insulated area.

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Old 04-11-2012, 11:35 PM   #3
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XPS foam exterior


Remember, Code is minimum, like getting a passing "D" on a test; http://publicecodes.citation.com/ico...001_par004.htm

http://www.greenbuildingadvisor.com/...ally-necessary

H.W./windows; http://www.greenbuildingadvisor.com/...s-housewrap-go

F.B./Windows: http://www.finehomebuilding.com/item...ting-sheathing

Stucco wrap with f.b. and OSB; http://www.buildingscience.com/docum...d%20in%20walls

Out of time, more on f.b. thickness later....

Gary
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Old 04-13-2012, 11:02 PM   #4
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XPS foam exterior


Yes, you are in Zone 5; http://publicecodes.citation.com/ico...001_par001.htm

A good read; http://www.buildingscience.com/docum...nsulation/view

An easier way: pp.10: http://www.buildingscience.com/docum...nd-wall-design

Gary
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