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Vinyl Siding installed over blueboard, no sheathing??

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PA1911

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Discussion starter · #1 · (Edited)
Vinyl Siding installed over blueboard insulation, no sheathing??

Hello

We are building a roof over a deck in the back of a customers house. It was built about ten years ago. We had to remove some siding from the second floor wall where we found that most of the wall has no wood sheathing at all. The vinyl siding is installed over 3/4" blue board insulation that is nailed directly to the studs. The only OSB sheathing on that wall is 4 feet at each end (the wall is 34 feet long)

there is no tyvek or other wrap, just studs, fiberglass insulation, blue insulation board, then siding.

Is this normal??

I have installed vinyl in the past but always over wood sheathing or old wood siding.

This house is fairly big and I know other exterior walls were done without wood sheathing as well.

Please let me know what you all think.

I appreciate all your help, and I look forward to learning more here (and hopefully contributing:thumbsup:)

Thanks,
PA1911
 
#6 ·
it was done a fair amount in the 90's and mid 2000's around here by high end builders as well, the only difference was having t-straps set into the studs. we would square up the wall first tack it to the floor then snap a chalkline at a 45 deg angle, cut a saw kerf with the circ saw then beat the tstrap into the kerf.. this in theory would keep the walls square.. though on a few occasions we had walls go out of plumb in heavy winds do to the wall racking..

most of the builders did away with it a few years back as we are on the coast and have been getting hit with hurricanes more frequantly... and they have been getting callbacks about it. now all walls get 7/16 for standard walls and 5/8 for shear walls
 
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#9 ·
1/2" only ... good god theres hardly any point for that. or is it that the foam has broken down over time and is now thinner

everything we used was 1" , the builder i framed for says they now use 2" over the osb.. the framing crews hated doing these houses as most of them were wood siding.. shingle jobs were a nightmare.. they would have to put osb over the foam so they could have a nailing base.. there was tyvek and lattice as well mind you
 
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#11 ·
I'm with Tins, but they get away with it by using strapping, and in some cases drilling rods into the corners at a 45 degree angle. I have obtained many a re-sides through these practices.


So used to griz being right!
 
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