I like the TYVEK material. It has kevlar in it. Very difficult for water to
transmit thru. If applied correctly, with tape, and ice and water over
window flanges ,I believe it is a superior product to our weather in the
Northeast. If you live in a dry climate , I guess it would not make a
difference which product you used. I have been told some areas of the
country require no building wrap. I have no knowledge of other areas.
fastening techniques vary ,check their website. Off to football!
If it's a concrete block house in Hawaii it's not going to make a bit of
If it's a standard 2 x 4 walls, OSB in corners, with black board sheathing
under vinyl siding in North Dakota - get ready for some pretty steep heating
I think the point a couple of us are trying to make is that some details of
the construction and location of the house would give us a shot at helping
you out. If you want generalities of what Tyvek does, that can be found on
DuPont's web site.
On Sun, 19 Nov 2006 20:10:28 -0500, Michael Bulatovich wrote:
Ahh - I get it. South central Texas. Wood frame house with stone exterior
and some hardiboard (sp?). The hardiboard is backed by that plywood-like
material. The stone is backed by some kind of foam-board and the
plywood-like material at any corners. House will be sealed with expanding
foam at all penetrations, including windows and doors.
There are two functions of Tyveck (besides making a profit for Dupont!)
First and foremost, it serves as a barrier against water intrusion
primarily from wind driven rain. You don't have to use Tyveck BTW. 30#
felt works too, and in fact is preferred by some people because of it
is more permeable to water vapor that Tyveck.
The second is to serve as an air barrier. In cold climates, cold air
leaks can strip the R value from your insulation. Not sure if this is
a factor in South Texas.
I have at times questioned the value of Tyveck in some applications,
but in the end, it's good cheap insurance and use it all the time.
Thanks for the good info and insight.
Seems that this may be less important in my situation, although I wish the
builder had used it. The builder tells me that with the plywood-like 4x8
sheets behind stone, tyvek is less of an issue and that the foam sheets
behind the hardiboard have a built in plastic covering that does much the
same as tyvek. I think this may be a bit of a stretch on his part. I
think the plastic covering on the foam boards is for protection during
shipment/handling. It is already starting to peel off.
But, I think the expanding foam that will be used to seal all the cracks
and other leak-points will cover the air-leakage point. Also, the exterior
walls are 2x6 and will have R19 insulation.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.