A quick update about rebond pad. The price of rebond goes up and down depending on the avialability of foam scrap. It is going to be difficult to predict what the price will be week to week. Often there is a shortage of scrap mostly due to production of furniture being moved to China. China also buys all the scrap foam it can. The higher rebond goes up in price, the more affordable froth foam (a superior pad to most rebonds) will become.
This type of padding is used most often by the floorcovering industry. It is made from of scraps of the high density foams used in furniture making that are bonded together. Rebond padding comes in various thicknesses and densities . The density is rated at so many pounds per cubic foot. For example, a 5 lb rebond pad would weigh 5lb per cubic foot. The carpet cushion council recommends a pad of at least 5lbs and 3/8 inch thickness for light traffic (your living room), and a pad of 6.5 lbs and 3/8 inch for heavy traffic (hallways). These are minimum guidelines, and I suggest that a 7 to 7.5 lb pad for longer wear. Also, the Carpet and Rug Institute (CRI) recommends that for residential use, the pad shall not exceed 7/16ths inch. I am sure this is because proper alignment with the tackstrip is best for a nicer looking finished product, and there is a less of a chance for too much up and down movement in the carpet. For top of the line reobnd, look for those made out of memory foam and a density of 8 lb per cubic foot.
There is a lot of talk about moisture barriers included in some rebond pads. Many moisture barriers are just a vinyl skin that is glued to the surface of the rebond pad. This sounds like a good idea, and is sold as a “pet proof” pad. In fact, this is at best a great marketing tool. However it does allow the “spill” to spread underneath the carpet and affect a larger area of the carpet. This could lead to more of the carpet backing failing, and thus damaging more of the carpet than if the spill had soaked into the pad. There are a few pads with a “breatheable” moisture barrier. Ask your dealer about them.