Bubble Foil Vapor Barrier Scams - False Claims About 11 R-Value By Other Products

hey this is ed i'm the owner of atticfoil.com and here's a common question we get from customers i see some bubble foil and foil fiberglass products advertise that they have an r value of 11. how can a product only a quarter inch thick have an r value of 11. that's a great question first of all the old saying if it sounds too good to be true it probably is and let me explain how these products get or claim an r11 and only be a quarter inch thick first let's talk a little bit about our value our value is generally used to measure the amount of conductive heat through a solid let me give you some examples of different r values this foam board has an r value of about six per inch regular fiberglass insulation bad insulation has an r value of about three or four per inch so common sense tells you that anything a quarter inch is only going to have an r value of about one and that's the case with these type products the actual r value of the product is about one now one thing to consider is when you start putting products together in an assembly you get what's called dead air so if you have two pieces of foam board and you've got a sealed space in between which is dead air dead air has an r value of about one per inch so in this situation you take the two pieces of foam board and add in an r value of about one for one inch of dead air when you see a product advertised and it says it's an r11 and it's only about a quarter inch thick what you have to do is look at the fine print usually the r11 comes from installing a product like this in either an assembly or a system and it gets a little tricky but let me explain exactly how that test is done what it's done is they take the product and they put it inside a two by four wood frame and then they sandwich this with two sheets of three quarter inch plywood now this whole assembly is put into a an r-value testing apparatus and it measures the heat flow down so the r11 actually comes from measuring this whole assembly not just the product so even if you take this product out the the bubble foil or the foil fiberglass insulation the r value is still going to be about eight or nine when you combine two sheets of plywood two two by four uh wood framing and three and a half inches of dead air so this is how the r11 is actually derived the problem is that these products are never installed in this way in order to get additional r value if you're stapling these in the bottom of a rafter in an attic you have air flowing on both sides of the attic in a ventilated attic you have no dead air space so you really don't get any additional r value all you get is the reflectivity and if you're looking to install a radiant barrier that's really all you're looking for is the reflectivity and that's why atticfoil same reflectivity as these products but you're going to get superior durability for a fraction of the cost so if you're looking to install the radiant barrier in your attic don't spend your money on these you're not going to get any additional benefit as far as reflectivity install the atticfoil and you're going to be cool comfortable and save a lot of money for more information on radiant barrier visit atticfoil.com you

Channel: AtticFoil Radiant Barrier Foil Insulation

Views: 246,049

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Id: zzD1TPJq_OQ

Length: 3min 46sec (226 seconds)

Published: Thu Apr 28 2011