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Old 06-22-2010, 07:30 AM   #1
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New sheathing/insulation on old house


I just purchased a home that was built in the 70's, long before code was in place apparently. And I have found out the builder used sheetrock for the EXTERIOR sheathing, yes I said sheetrock. So I'm looking to remove the old aluminum siding and sheetrock and start over from the framing.
Its only 2x4 exterior walls, so I want to add foam insulation then re-sheath with osb, then add new windows and vinyl siding.
What is the proper order for installing everything, should I put the foam against the studs first then sheath it, then wrap it with typec house wrap??

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Old 06-22-2010, 04:33 PM   #2
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New sheathing/insulation on old house


I’m sure it’s “Fire Rock” and not sheetrock, we used it all the time on the exteriors of apartments and hotels. Never on houses though.

Are you sure there is no sheathing behind it?

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Old 06-22-2010, 04:44 PM   #3
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New sheathing/insulation on old house


it might be firerock, but definity no sheathing behind it. Its a split entry 1800 sq ft, that sold for about $25,000 in the mid 70s, so build real cheap.
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Old 06-22-2010, 05:13 PM   #4
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New sheathing/insulation on old house


Fire Rock alone was used for the sheathing. There was a nailing inspection before covering, just like plywood.

I’m sure there will be lots of opinions on this and I’d like to see them.

I wouldn’t tear it off, assuming it’s not covered in mold
and your walls are insulated.

You can, and in some areas it is code to stud nail vinyl siding.
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Old 06-22-2010, 05:17 PM   #5
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New sheathing/insulation on old house


you could sheath right over it,then you have a place to put a nail anyplace you like
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Old 06-22-2010, 05:19 PM   #6
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New sheathing/insulation on old house


Yes you could but a lot of extra cost so you don’t have to hit a stud.
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Old 06-22-2010, 05:26 PM   #7
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New sheathing/insulation on old house


its how i would handle it Ron,many times depending on trim detail its impossible to hit the studs near corners and window and doors,areas in between windows depending on the size of the piece will have no studs available to nail into,and most of the shake type panels need nailing every 8 inches
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Old 06-22-2010, 05:38 PM   #8
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New sheathing/insulation on old house


That’s what I’d do too, just a suggestion. Could save some substantial bucks and still work fine.

Should be plenty of meat for a standard vinyl corner. J against the window would work fine too. Trim against the window then J, wouldn’t work without breaking a few rules.

No good for “Cedar Impressions“. Not so sure about Cranes “Impression of Cedar” though.
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Old 06-22-2010, 05:39 PM   #9
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New sheathing/insulation on old house




usually ill eliminate the foam layer,saves some bucks and the difference in R value between 1/2 sheathing and 1/2 foam to me anyway is not too significant

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Old 06-22-2010, 06:02 PM   #10
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New sheathing/insulation on old house


In most cases foam’s a joke IMO.

” fan fold.

The only real purpose of the foam is to cover old lap siding and give you a new smooth surface to work on.

I never foam over T1-11 unless they make me.

It's their product though, they can market it anyway they want.

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