[Greenbuilding] taping plywood seams vs. vapor barrier

John Salmen terrain at shaw.ca
Mon Jul 1 12:08:17 MDT 2013


Weather has changed here. We seem to get more intense periods of rain with
limited periods for drying followed by sun - so we have saturated exterior
materials with increased potential for sun driven moisture. 

 

We also have rainscreens so ideally we want a high permeability, non
perforated wrb. Tar paper can work as it can hold and release some moisture
but I think its worth avoiding any potential of a leaching material. 

 

I still think it goes back to redundancy 'predictive leakage'. Taping seams
on the sheathing layer (has added benefit of limiting osb edge swelling),
high perm wrb, rainscreen and then some material that can survive being
saturated (for us in bc).

 

I am a bit leery of zip sheathing only because water failure is more about
flashings and penetrations and there seems more potential for flashings to
fail.

 

 

From: Greenbuilding [mailto:greenbuilding-bounces at lists.bioenergylists.org]
On Behalf Of Sam Ewbank
Sent: July-01-13 6:52 AM
To: Green Building
Subject: Re: [Greenbuilding] taping plywood seams vs. vapor barrier

 

That Doug fir is likely a lot older than that before being milled.
30# felt would do the job for water control but I would be interested what
in what some of the list members from wet and wild BC Canada are using. 
Sam

On Jul 1, 2013 9:34 AM, "Reuben Deumling" <9watts at gmail.com> wrote:

I am not doing anything with brick. The exterior is/will be 100 year old
reused Douglas fir shiplap siding.

 

On Mon, Jul 1, 2013 at 6:29 AM, John Straube <jfstraube at gmail.com> wrote:

Reuben is it true you are you doing a brick brown stone? I thought you were
doing a wood frame?


On 2013-07-01, at 8:55 AM, gennaro brooks-church <gennarobc at gmail.com>
wrote:

> Sam
> This is in NYC so they are brick brownstones.
>
> Gennaro Brooks-Church
> EcoBrooklyn.com
> 347-244-3016
> 22 2nd St., Brooklyn.
> This email was sent from my phone.
>
> On Jul 1, 2013, at 8:53 AM, Sam Ewbank <g.l.ewbank at gmail.com> wrote:
>
>> Gennaro-What do you use as a weather control barrier over the plywood?
>>
>> Rueben- One west coast supplier of SIGA brand tapes is Small Planet
Workshop.
>> http://www.smallplanetworkshop.com/siga-the-company-products/
>>
>> I've had good luck using 3-m 8067 all weather flashing tape around
windows but don't know if it will last as long as the SIGA
>>
>> Sam
>>
>> On Mon, Jul 1, 2013 at 8:15 AM, gennaro brooks-church
<gennarobc at gmail.com> wrote:
>> We have done this in the Passive House community. Use a good tape.
>> Call my friends at 475. They have tape.
>>
>> Gennaro Brooks-Church
>> EcoBrooklyn.com
>> 347-244-3016
>> 22 2nd St., Brooklyn.
>> This email was sent from my phone.
>>
>> On Jul 1, 2013, at 1:46 AM, Reuben Deumling <9watts at gmail.com> wrote:
>>
>> > If I carefully tape all the seams on the plywood sheathing, and achieve
the dense pack cellulose I'm aiming for, is there a reason to also use a
Tyvek type paper on the exterior as well?
>> > _______________________________________________
>> > Greenbuilding mailing list
>> > to Send a Message to the list, use the email address
>> > Greenbuilding at bioenergylists.org
>> >
>>
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John Straube
www.JohnStraube.com



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