lumps in carpet underpad
we moved into a new construction house 6 months ago and have noticed several "lumps" in our carpets upstairs.
While they are not visible, you can certainly feel them when walking on the carpet. Today, one of the builder's service guys came up and pulled up the carpet in one of the bedrooms and we noticed that the actual underpad has random hard plastic/rubber particals that are causing these lumps. This is an upgraded underpad that we paid over $1500 to upgrade.... is this normal or should I be going after the builder to replace the underpad?