My wife recently bought Anderson windows for her house. Interior trim supposed to be stain grade. All the single unit double hung windows came with installed solid pine extension jams. The larger 2 window units came with extension jams that our contractor will apply. Most of the jam pieces we were provided are finger jointed out of 6 to 8 inch pieces. The home center we bought from insists finger jointed is stain grade, and insists that this is Anderson's standard. I don’t really believe this. I have seroius doubts about what stained finger jointed trim will look like. Who’s right? What is the industry practice/standard?