No need to take the carpet in for a checkup; if you already have the carpet, just take a look at the backside. It should be either:
- a woven backing that looks similar to window screen, only with a looser weave.
- a sheet of fine, white spun material
-or it will have a backing that is a layer of foam rubber, usually black or almond in color.
If it's the first, a loosely woven backing, look to see if it's a black or white plastic-type of material, or does it look more like a natural hemp, rope-type product.
Next, look at the face of the carpet; is this a soft-finish yarn, or is it a stiffer, more "obviously plastic" material (high-gloss material similar to the common bright green Astroturf that was seen for many years on porches & patios).
Post back with what you find, and any information about the carpet you might have, especially if you recently bought it; your receipt may tell you something, such as "100% Olefin." Anything like this will help to identify it's composition & how it should be installed.