After 15 years, I could not believe how many rotting sills and sashes I have replaced or repaired. I built a new home in 2000 and wanted the best windows and doors. My contractor recommended Kolbe. What a mistake, after spending $85,000. We had the problem before 10 years, but the last 5 years has been a nightmare. It's a monthly job tending to repairs and replacements. The Kolbe rep said he can't do any warranty but said it was so bad that he would sell windows at cost. That's a joke because I called as another consumer to order a new sash and it was the same price as cost. DON'T Ever use Kolbe products, it is total junk. There, after that rant, I feel a little better but it's not making the problem go away.