Moisture migration happens in every structure. Tyvek is a code required vapor barrier with no insulating qualities that is applied after the dry-in stage of most new construction. A vapor barrier is not "vapor proof" or "airtite" as you say, it must allow for controlled migration or where you are headed with your thinking is the end result.....it isn't a plastic bubble, it's a vapor barrier with insulating properties among several other benefits.Windows on Washington wrote:Vapor barrier on the outside of the structure in a cold climate? That is interesting, and ultimately not recommended. Does Champion put a vapor barrier on the inside of the building as well or do they let all the moisture migrate outside? If the foam is as airtight as it is touted, how to you get the moisture through the product and out of the home?
What kind of foam is this fan fold made of? 3.9 per 3/8ths of an inch out of a foam product that is typically around R-5 per inch. Are you telling me that the foil barrier adds that much R value? Does foil work more efficiently when it is not in direct contact with the substrate you are trying to insulate? All of the installation guidelines for the radiant barriers that I have ever seen do not place it in direct contact with the heat source they are trying to block. In this case, you are trying to reflect the heat back indoors but are really creating a heat sink effect that is broken by the 3/8 inch foam.
If you are in D.C. I know that there was a campaign years back where the Public Utility comission would take a thermal image of you home to show you what you needed to do to improve the efficiency, so,.if you think along those lines, you will determine the feature and benefit without me promoting it.
If you would like a sample of the product, I am sure that any Division manager would be happy to show you one or even show you a scale mock up of an install or even give the consentual addresses of consumers that have chosen this aplication for thier needs. Since I am accused of promoting on here,..I'm gonna just let what I have stated stand, but,.. keep in mind that efficiency keeps greenhouse gasses out of the atmosphere, just as using recycled vinyl keeps it out of landfills, so,..maybe you could just swing in and check it for yourself if you happen by a factory showroom.
I currently have one project where the homeowners specifically chose the product I represent for 2 reaasons in this order..
1. Insulating value
2. Warranty
3 Company reputation (he already lost 7k to contractors running off with his deposits for other projects)
4. Price
5. The right product for the application. (Needed insulation, wanted maintenance free exterior)
it is a 110 year old cedar shake stick framed 2 story that the wind blew thru the walls on the weather facing side. The homeowner is a serious do-it-yourselfer in so far that he has even re-roofed his rubber roof, so I wouldn't classify him as ignorant in the building trades and I certainly would not attempt to misrepresent a product to him as he knows what is what and wherefor. The job will be finished mid-week, and they have agreed to tell me how it suits thier neeeds,..good ,bad, or indifferent, so, if that piques your interest I guess we can find some way to satisfy your curiosity that won't get me banned from this board for promoting.
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