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Old 01-16-2011, 08:31 AM   #16
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taping OSB sheathing joints


We are "air sealing" all our walls here in MN. Not a good idea IMO. Good for energy, bad for mold/moisture. Which one will affect you sooner?

No horizontal gaps like mentioned in the link. Our sheathing is put on vertically and the seams on taller walls are simply blocked with 2x's.


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Old 01-16-2011, 09:06 AM   #17
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taping OSB sheathing joints


i'm going to start drillin vent hole pores in the walls from now on
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Old 01-16-2011, 09:20 AM   #18
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taping OSB sheathing joints


Soooo, you guys think sealing up the gaps on the sheathing is a good thing?

Isn't that moving one step closer to an exterior vapor barrier?

In my climate zone, I've been taught that the exterior wall surface needs to be several times more permeable than the interior.

Creating a non-permeable surface on both sides of the wall assembly sounds like cetain failure to me, considering the virtual impossibility of closing up all the gaps between framing and finish materials attached to the wall.

Moisture will find a way in, giving it a little help getting back out is a good thing, IMO.

If you want an airtight wall assembly, you may as well just tar and feather it, allowing it to be the albatross that it is.
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Old 01-16-2011, 09:23 AM   #19
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taping OSB sheathing joints


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i'm going to start drillin vent hole pores in the walls from now on
Hmmm, perforated wall sheathing......

It's a shame that ideas already been taken by the ridgid foam guys.
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Old 01-16-2011, 02:10 PM   #20
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taping OSB sheathing joints


In 1988, when I converted my 2 attic rooms to 3 bdrm. and a 3/4 bath, I cut slots in the OSB every 6" apart because I had installed it on new houses and knew it repelled water and of the advertised perms when it first came out here, years earlier. Don't do this if required on the corners or for a structural (shear) wall. No mold yet as I replaced some siding this year from raccoon damage, though the 15# felt paper was thin and brittle. (use 30#, especially today.......) Tom, Dupont Tyvek is one of the spray-on, air barrier but moisture permeable; http://docs.google.com/viewer?a=v&q=cache:uawmJu69hb0J:www2.dupont.com/Tyvek_Weatherization/en_US/assets/downloads/pdfs/072619%2520-%2520Dupont%2520Tyvek%2520Fluid-Applied%2520Weather%2520Barrier%25208%2520Apr10%25 20FINAL%2520(2).doc+test+of+air+leakage+at+sheathi ng+joints&hl=en&gl=us&pid=bl&srcid=ADGEESjlBfOXaN6 7ZGT7b6MnI1csjEoovZyTBxmqUVawL27OnbWrZRsBP8HGxSDMv IJKuCT9EwO0QoZEZ3QAwQTlqpvaoyxN6UdiJc6uokDDCEml7-utVElaQL-3HuflzCpNvS8Icw3i&sig=AHIEtbR2MyFSlEMDVUtt8eiQhngF LZ5U6Q

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Old 01-16-2011, 03:35 PM   #21
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taping OSB sheathing joints


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Originally Posted by loneframer View Post
Sooo, you guys think sealing up the gaps on the sheathing is a good thing?

Isn't that moving one step closer to an exterior vapor barrier?

In my climate zone, I've been taught that the exterior wall surface needs to be several times more permeable than the interior.

Creating a non-permeable surface on both sides of the wall assembly sounds like certain failure to me, considering the virtual impossibility of closing up all the gaps between framing and finish materials attached to the wall.

Moisture will find a way in, giving it a little help getting back out is a good thing, IMO.

If you want an airtight wall assembly, you may as well just tar and feather it, allowing it to be the albatross that it is.

i don't think taping the osb seams is a good idea,or even effective over the long term,and combining that with a foam wrb,well...i for one have my doubts

i know Gary keeps telling me how much less permeable osb is compared to ply,it's just that in my experience ive never personally seen a big difference [from a moisture management point] between the 2

just like i never saw a difference between plastic or felt wrbs,i read the science but i don't see the difference in my ''real'' world
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Old 01-16-2011, 04:31 PM   #22
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taping OSB sheathing joints


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i don't think taping the osb seams is a good idea,or even effective over the long term,and combining that with a foam wrb,well...i for one have my doubts

i know Gary keeps telling me how much less permeable osb is compared to ply,it's just that in my experience ive never personally seen a big difference [from a moisture management point] between the 2

just like i never saw a difference between plastic or felt wrbs,i read the science but i don't see the difference in my ''real'' world
Well Tom, real world conditions are what I base my opinions on as well.
I believe my own two eyes before I believe what I read. However, when I read something that reinforces what I have seen with my own eyes, it carries more weight.
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Old 01-16-2011, 08:17 PM   #23
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taping OSB sheathing joints


i wasn't tryin to be persnickety

http://dictionary.reference.com/browse/persnickety

i know you have seen tyvek become brittle,so have ibut only the early version
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Old 01-16-2011, 09:02 PM   #24
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taping OSB sheathing joints


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i wasn't tryin to be persnickety

http://dictionary.reference.com/browse/persnickety

i know you have seen tyvek become brittle,so have ibut only the early version
I wasn't sniping at you Tom. I still bow to the vinyl king.

I was speaking in broader terms than that, but since you brought it up, yes I prefer asphalt saturated felt for a WRB, in almost every scenario.

All together now..."Variable Permeability"
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Old 01-16-2011, 10:07 PM   #25
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i know i know i know i know........your the best
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Old 01-17-2011, 06:48 AM   #26
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taping OSB sheathing joints


OSB has variable permeability as well. Once it turns to mush it is totally permeable.
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Old 01-17-2011, 06:51 AM   #27
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Old 01-17-2011, 10:27 AM   #28
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Figures 27, 46, 57, 77, etc.,........ http://www.google.com/url?sa=t&sourc...DCcvwQ&cad=rja

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Old 01-17-2011, 04:49 PM   #29
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taping OSB sheathing joints


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OSB has variable permeability as well. Once it turns to mush it is totally permeable.
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Oh, I see how it's gonna be around here.
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Old 01-17-2011, 05:33 PM   #30
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Oh, I see how it's gonna be around here.
Yup, Tom and I try to act like we know what we're talking about

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