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Wood on the enrty will help stop it, also find the end of the part of the carpet that has begun to unravel and cut it with a sharp knife or clip with a sissors and place a drop of glue on the end down in the carpet, stay off it until it dries. That should work....
seweing kit and a glue strip or sealent under the seam without looking at it. I would call a capet install compamy and have them look at it for sure. Find out what the cause is before the remedy. Gavigan Homes uses Lowes for install